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  • WebLogic Server Performance and Tuning: Part II - Thread Management

    - by Gokhan Gungor
    WebLogic Server, like any other java application server, provides resources so that your applications use them to provide services. Unfortunately none of these resources are unlimited and they must be managed carefully. One of these resources is threads which are pooled to provide better throughput and performance along with the fast response time and to avoid deadlocks. Threads are execution points that WebLogic Server delivers its power and execute work. Managing threads is very important because it may affect the overall performance of the entire system. In previous releases of WebLogic Server 9.0 we had multiple execute queues and user defined thread pools. There were different queues for different type of work which had fixed number of execute threads.  Tuning of this thread pools and finding the proper number of threads was time consuming which required many trials. WebLogic Server 9.0 and the following releases use a single thread pool and a single priority-based execute queue. All type of work is executed in this single thread pool. Its size (thread count) is automatically decreased or increased (self-tuned). The new “self-tuning” system simplifies getting the proper number of threads and utilizing them.Work manager allows your applications to run concurrently in multiple threads. Work manager is a mechanism that allows you to manage and utilize threads and create rules/guidelines to follow when assigning requests to threads. We can set a scheduling guideline or priority a request with a work manager and then associate this work manager with one or more applications. At run-time, WebLogic Server uses these guidelines to assign pending work/requests to execution threads. The position of a request in the execute queue is determined by its priority. There is a default work manager that is provided. The default work manager should be sufficient for most applications. However there can be cases you want to change this default configuration. Your application(s) may be providing services that need mixture of fast response time and long running processes like batch updates. However wrong configuration of work managers can lead a performance penalty while expecting improvement.We can define/configure work managers at;•    Domain Level: config.xml•    Application Level: weblogic-application.xml •    Component Level: weblogic-ejb-jar.xml or weblogic.xml(For a specific web application use weblogic.xml)We can use the following predefined rules/constraints to manage the work;•    Fair Share Request Class: Specifies the average thread-use time required to process requests. The default is 50.•    Response Time Request Class: Specifies a response time goal in milliseconds.•    Context Request Class: Assigns request classes to requests based on context information.•    Min Threads Constraint: Limits the number of concurrent threads executing requests.•    Max Threads Constraint: Guarantees the number of threads the server will allocate to requests.•    Capacity Constraint: Causes the server to reject requests only when it has reached its capacity. Let’s create a work manager for our application for a long running work.Go to WebLogic console and select Environment | Work Managers from the domain structure tree. Click New button and select Work manager and click next. Enter the name for the work manager and click next. Then select the managed server instances(s) or clusters from available targets (the one that your long running application is deployed) and finish. Click on MyWorkManager, and open the Configuration tab and check Ignore Stuck Threads and save. This will prevent WebLogic to tread long running processes (that is taking more than a specified time) as stuck and enable to finish the process.

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  • Organization &amp; Architecture UNISA Studies &ndash; Chap 6

    - by MarkPearl
    Learning Outcomes Discuss the physical characteristics of magnetic disks Describe how data is organized and accessed on a magnetic disk Discuss the parameters that play a role in the performance of magnetic disks Describe different optical memory devices Magnetic Disk The way data is stored on and retried from magnetic disks Data is recorded on and later retrieved form the disk via a conducting coil named the head (in many systems there are two heads) The writ mechanism exploits the fact that electricity flowing through a coil produces a magnetic field. Electric pulses are sent to the write head, and the resulting magnetic patterns are recorded on the surface below with different patterns for positive and negative currents The physical characteristics of a magnetic disk   Summarize from book   The factors that play a role in the performance of a disk Seek time – the time it takes to position the head at the track Rotational delay / latency – the time it takes for the beginning of the sector to reach the head Access time – the sum of the seek time and rotational delay Transfer time – the time it takes to transfer data RAID The rate of improvement in secondary storage performance has been considerably less than the rate for processors and main memory. Thus secondary storage has become a bit of a bottleneck. RAID works on the concept that if one disk can be pushed so far, additional gains in performance are to be had by using multiple parallel components. Points to note about RAID… RAID is a set of physical disk drives viewed by the operating system as a single logical drive Data is distributed across the physical drives of an array in a scheme known as striping Redundant disk capacity is used to store parity information, which guarantees data recoverability in case of a disk failure (not supported by RAID 0 or RAID 1) Interesting to note that the increase in the number of drives, increases the probability of failure. To compensate for this decreased reliability RAID makes use of stored parity information that enables the recovery of data lost due to a disk failure.   The RAID scheme consists of 7 levels…   Category Level Description Disks Required Data Availability Large I/O Data Transfer Capacity Small I/O Request Rate Striping 0 Non Redundant N Lower than single disk Very high Very high for both read and write Mirroring 1 Mirrored 2N Higher than RAID 2 – 5 but lower than RAID 6 Higher than single disk Up to twice that of a signle disk for read Parallel Access 2 Redundant via Hamming Code N + m Much higher than single disk Highest of all listed alternatives Approximately twice that of a single disk Parallel Access 3 Bit interleaved parity N + 1 Much higher than single disk Highest of all listed alternatives Approximately twice that of a single disk Independent Access 4 Block interleaved parity N + 1 Much higher than single disk Similar to RAID 0 for read, significantly lower than single disk for write Similar to RAID 0 for read, significantly lower than single disk for write Independent Access 5 Block interleaved parity N + 1 Much higher than single disk Similar to RAID 0 for read, lower than single disk for write Similar to RAID 0 for read, generally  lower than single disk for write Independent Access 6 Block interleaved parity N + 2 Highest of all listed alternatives Similar to RAID 0 for read; lower than RAID 5 for write Similar to RAID 0 for read, significantly lower than RAID 5  for write   Read page 215 – 221 for detailed explanation on RAID levels Optical Memory There are a variety of optical-disk systems available. Read through the table on page 222 – 223 Some of the devices include… CD CD-ROM CD-R CD-RW DVD DVD-R DVD-RW Blue-Ray DVD Magnetic Tape Most modern systems use serial recording – data is lade out as a sequence of bits along each track. The typical recording used in serial is referred to as serpentine recording. In this technique when data is being recorded, the first set of bits is recorded along the whole length of the tape. When the end of the tape is reached the heads are repostioned to record a new track, and the tape is again recorded on its whole length, this time in the opposite direction. That process continued back and forth until the tape is full. To increase speed, the read-write head is capable of reading and writing a number of adjacent tracks simultaneously. Data is still recorded serially along individual tracks, but blocks in sequence are stored on adjacent tracks as suggested. A tape drive is a sequential access device. Magnetic tape was the first kind of secondary memory. It is still widely used as the lowest-cost, slowest speed member of the memory hierarchy.

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  • Reducing Deadlocks - not a DBA issue ?

    - by steveh99999
     As a DBA, I'm involved on an almost daily basis troubleshooting 'SQL Server' performance issues. Often, this troubleshooting soon veers away from a 'its a SQL Server issue' to instead become a wider application/database design/coding issue.One common perception with SQL Server is that deadlocking is an application design issue - and is fixed by recoding...  I see this reinforced by MCP-type questions/scenarios where the answer to prevent deadlocking is simply to change the order in code in which tables are accessed....Whilst this is correct, I do think this has led to a situation where many 'operational' or 'production support' DBAs, when faced with a deadlock, are happy to throw the issue over to developers without analysing the issue further....A couple of 'war stories' on deadlocks which I think are interesting :- Case One , I had an issue recently on a third-party application that I support on SQL 2008.  This particular third-party application has an unusual support agreement where the customer is allowed to change the index design on the third-party provided database.  However, we are not allowed to alter application code or modify table structure..This third-party application is also known to encounter occasional deadlocks – indeed, I have documentation from the vendor that up to 50 deadlocks per day is not unusual !So, as a DBA I have to support an application which in my opinion has too many deadlocks - but, I cannot influence the design of the tables or stored procedures for the application. This should be the classic - blame the third-party developers scenario, and hope this issue gets addressed in a future application release - ie we could wait years for this to be resolved and implemented in our production environment...But, as DBAs  can change the index layout, is there anything I could do still to reduce the deadlocks in the application ?I initially used SQL traceflag 1222 to write deadlock detection output to the SQL Errorlog – using this I was able to identify one table heavily involved in the deadlocks.When I examined the table definition, I was surprised to see it was a heap – ie no clustered index existed on the table.Using SQL profiler to see locking behaviour and plan for the query involved in the deadlock, I was able to confirm a table scan was being performed.By creating an appropriate clustered index - it was possible to produce a more efficient plan and locking behaviour.So, less locks, held for less time = less possibility of deadlocks. I'm still unhappy about the overall number of deadlocks on this system - but that's something to be discussed further with the vendor.Case Two,  a system which hadn't changed for months suddenly started seeing deadlocks on a regular basis. I love the 'nothing's changed' scenario, as it gives me the opportunity to appear wise and say 'nothings changed on this system, except the data'.. This particular deadlock occurred on a table which had been growing rapidly. By using DBCC SHOW_STATISTICS - the DBA team were able to see that the deadlocks seemed to be occurring shortly after auto-update stats had regenerated the table statistics using it's default sampling behaviour.As a quick fix, we were able to schedule a nightly UPDATE STATISTICS WITH FULLSCAN on the table involved in the deadlock - thus, greatly reducing the potential for stats to be updated via auto_update_stats, consequently reducing the potential for a bad plan to be generated based on an unrepresentative sample of the data. This reduced the possibility of a deadlock occurring.  Not a perfect solution by any means, but quick, easy to implement, and needed no application code changes. This fix gave us some 'breathing space'  to properly fix the code during the next scheduled application release.   The moral of this post - don't dismiss deadlocks as issues that can only be fixed by developers...

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  • Retrofit Certification

    - by Bill Evjen
    Impact of Regulations on Cabin Systems Installation John Courtright, Structural Integrity Engineering There are “heightened” FAA attention to technical issues related to IFE and Wi-Fi Systems Installations The Aging Aircraft Safety Rule – EWIS & Damage Tolerance Analysis The Challenge: Maximize Flight Safety While Minimizing Costs Issue Papers & Testing, Testing, Testing The role of Airworthiness Directives (ADs) on the design of many IFE systems and all antenna systems. Goal is safety AND cost-effective maintenance intervals and inspection techniques The STC Process Briefly Stated Type Certifications (TC) Supplemental Type Certifications (STC) The STC Process Project Specific Certification Plan (PSCP) Managed by FAA Aircraft Certification Office (ACO) Type of Project (Electrical/Mechanical Systems or Structural) Specific Type of Aircraft Being Modified Schedule Design & Installation Location What does the STC Plan (PSCP) Cover? System Description – What does the system do? System qualification – Are the components qualified? Certification requirements – What FARs are applicable? Installation detail – what is being modified? Prototype installation – What is new? Functional hazard Assessment (FHA) – is it safe? EZAP-EWIS Requirements – Any aging aircraft issues? Certification Data – How is compliance achieved? Delegation and FAA involvement – Who is doing the work? Proposed certification schedule – When is the installation? Certification documentation – What the FAA Expects to see Cabin Systems Certification Concerns In addition to meeting the requirements for DO-160, Cabin System Certification needs to address issues related to: Power management: Generally, IFE and Wi-Fi Systems are classified as “Non-Essential Equipment” from a certification viewpoint. Connected to “non-essential” power buses Must be able to shed IFE & Wi-Fi Systems in a smoke/fire event or Other electrical emergency (FAA Policy 00-111-160) FAA is more relaxed with testing wi-fi. It used to be that you had to have 150 seats with laptops running wi-fi, but now it is down to around 50. Aging aircraft concerns – electrical and structural Issue papers addressing technical concerns involving: “Structural Certification Criteria for Large Antenna Installations” Antenna “Vibration/Buffeting Compliance Criteria” DO-160 : Environmental Test Procedures DO 160 – “Environmental Conditions and Test Procedures for Airborne Equipment”, Issued by RTCA Provides guidance to equipment manufacturers as to testing requirements Temperature: –40C to +55C Vibration and Shock Contaminant susceptibility – fluids and dust Electro-magnetic Interference Cabin systems are generally classified as “non-essential” Swissair 111 crashed (in part) due to non-standard wiring practices. EWIS Design Implications Installation design must take EWIS Requirements into account. This generally means: Aircraft surveys are needed to identify proper wire routing Ensure existing wiring diagrams are correct Identify primary/Secondary/Tertiary bus locations Verify proper separation of wire bundles exist Required separation from fuel quantity indicator system (FQIS) to prevent fuel tang ignition Enhanced Zonal Analysis Procedure (EZAP) Performed EZAP was developed by the Aging Transport Systems Rulemaking Advisory Committee (ATSRAC) EZAP is the method for analyzing airplane zones with an emphasis on evaluating wiring systems and the existence of combustibles  in the cabin. Certification Considerations for Wi-Fi Systems Electrical – All existing DO 160 testing required Issue papers required Onboard EMI testing – any interference with aircraft systems when multiple wi-fi users are logged on? Vibration/Buffeting compliance criteria – what is the effect of the antenna on aircraft flight characteristics? Structural certification criteria – what are the stress loads on the aircraft at the antenna location and what is the impact on maintenance inspection criteria for the airline? Damage tolerance analysis required Goal – minimize maintenance inspection intervals

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  • Web Developer - How to enhance my skillset?

    - by atif089
    First of all pardon my English. I am not a native English speaker I have been a Web Developer for the past 4 years. In these 4 years I have spent my time on the internet to learn things. My current skillset comprises of HTML CSS PHP MySQL jQuery (I would not say js and rather say jQuery because I am good at using jQuery and bad with plain javascript.) The above things seemed like an easier part of my life as I quickly learned them. But now I would really like to enhance my skillset and I am pretty confused which way to move ahead considering that I have to learn things using the web and references on my own. Design My first option is towards design. Shall I get started with design and start using Adobe Illustrator, Photoshop, Flash, Flex. Designing along with my previous skills looks like a money maker to me. As both are co-related to each other when web design is considered. And its easier to learn the first 2 and I hope I can get tutorials for the last 2 as well. Marketing A lot of my existing clients asked me if I do SEO. So this looked as a good field to me as well. I cannot estimate the scope of SEO but I assume it has a long future. Since I am business minded as well and there are a lot of tutorials around, should I start with SEO, SEM, Social Media, PPC or whatever it consists of. Software Development The complex plight and hardest thing (perhaps) but the easiest way to find a decent job in my location. If I go for software development what platform should be that I should be ideally going after? Should it be C# for windows development, or ASP.NET (once again enhances my skill set), J2EE (there are a lot of jobs for J2EE developers here) or plain C and C++. Also I think it is difficult to learn software languages right from Hello World, using internet? I have no clue how I learned PHP but I am sort of a pro now, but these other languages seems like a disaster to me? I cant figure out the reason if its because PHP is easier or there was a lot of tutorials around for PHP. Anyways is it also possible to learn software development right from Hello World using the web? Database / Server (Linux) / Network Administration Seems like a job with a decent pay but less number of jobs and a bit harder to learn online. (not sure) What should be the right track I should move ahead. P.S - Age is not a constraint for me as I am between 20-21, and I come from an IT background. I know quite little basics about C (upto structures) C++ (upto objects, I was not able to understand templates) Core Java (some basics and OOP concept) RDBMS Visual Basic 6 (used to do this long back) UNIX (a bunch of commands like who, finger, chmod, ls and a bit of #bash) Or is there anything else that I left out? I need you guys to please give me a feedback and the reason why I should select that field.

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  • Notes - Part II - Play with JavaFX

    - by Silviu Turuga
    Open the project from last lesson Double click on NotesUI.fmxl, this will open the JavaFX Scene Builder On the left side you have a area called Hierarchy, from there press Del or Shift+Backspace on Mac to delete the Button and the Label. You'll receive a warning, that some components have been assigned an fx:id, click Delete as we don't need them anymore. Resize the AnchorPane to have enough room for our design, eg. 820x550px From the top left pick the Container called Accordion and drag over the AnchorPane design Chose then from Controls a List View and drag inside the Accordion. You'll notice that by default the Accordion has 2 TitledPane, and you can switch between them by clicking on their name. I'll let you the pleasure to do the rest in order to get the following result  Here is the list of objects used Save it and then return to NetBeans Run the application and it should be run without any issue. If you click on buttons they all are functional, but nothing happens as we didn't link them with any action. We'll see this in the next episode. Now, let's play a little bit with the application and try to resize it… Have you notice the behavior? If the form is too small, some objects aren't visible, if it is too large there is too much space . That's for sure something that your users won't like and you as a programmer have to care about this. From NetBeans double click NotesUI.fmxl so to return back to JavaFX Scene Builder Select the TextField from bottom left of Notes, the one where I put the text Category and then from the right part of JavaFX Scene Builder you'll notice a panel called Inspector. Chose Layout and then click on the dotted lines from left and bottom of the square, like you see in the below image This will make the textfield to have always the same distance from left and bottom no matter the size of the form. Save and run the application. Note that whenever the form is changing the Height, the Category TextField has the same distance from the bottom. Select Accordion and do the same steps but also check the top dotted line, because we want the Accordion to have the same height as the main form has. I'll let you the pleasure to do the same for the rest of components. It's very important to design an application that can be resize by user and in the same time, all the buttons are on place. Last step is to make sure our application is not getting smaller then a certain size, as this will hide parts of our layout. So select the AnchorPane and from Inspector go to Layout and note down the Width and Height. Go back to NetBeans and open the file Main.java and add the following code just after stage.setScene(scene); (around line 26) stage.setMinWidth(820); stage.setMinHeight(550); Use your own width and height. This will prevent user to reduce the width or height of your application to a value that will hide parts of your layout. So now you should have done most of the design part and next time we'll see how can we enter some data into our newly created application… Note: in case you miss something, here are the source files of the project till this point. 

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  • I am trying to create an windows application watcher? [migrated]

    - by Broken_Code
    I recently started coding in c #(in may this year) and well I find it best to learn by working with code. this application http://www.c-sharpcorner.com/UploadFile/satisharveti/ActiveApplicationWatcher01252007024921AM/ActiveApplicationWatcher.aspx. I am trying to recreate it however mine will be saving the information into an sql database(new at this as well). I am having some coding problems though as it does not do what I expect it to do. THis is the main code I am using. private void GetTotalTimer() { DateTime now = DateTime.Now; IntPtr hwnd = APIFunc.getforegroundWindow(); Int32 pid = APIFunc.GetWindowProcessID(hwnd); Process p = Process.GetProcessById(pid); appName = p.ProcessName; const int nChars = 256; int handle = 0; StringBuilder Buff = new StringBuilder(nChars); handle = GetForegroundWindow(); appltitle = APIFunc.ActiveApplTitle().Trim().Replace("\0", ""); //if (GetWindowText(handle, Buff, nChars) > 0) //{ // string strbuff = Buff.ToString(); // StrWindow = strbuff; #region insert statement try { if (Conn.State == ConnectionState.Closed) { Conn.Open(); } if (Conn.State == ConnectionState.Open) { SqlCommand com = new SqlCommand("Select top 1 [Window Title] From TimerLogs ORDER BY [Time of Event] DESC", Conn); SqlDataReader reader = com.ExecuteReader(); startTime = DateTime.Now; string time = now.ToString(); if (!reader.HasRows) { reader.Close(); cmd = new SqlCommand("insert into [TimerLogs] values(@time,@appName,@appltitle,@Elapsed_Time,@userName)", Conn); cmd.Parameters.AddWithValue("@time", time); cmd.Parameters.AddWithValue("@appName", appName); cmd.Parameters.AddWithValue("@appltitle", appltitle); cmd.Parameters.AddWithValue("@Elapsed_Time", blank.ToString()); cmd.Parameters.AddWithValue("@userName", userName); cmd.ExecuteNonQuery(); Conn.Close(); } else if(reader.HasRows) { reader.Read(); if (appltitle != reader.ToString()) { reader.Close(); endTime = DateTime.Now; appduration = endTime.Subtract(startTime); cmd = new SqlCommand("insert into [TimerLogs] values (@time,@appName,@appltitle,@Elapsed_Time,@userName)", Conn); cmd.Parameters.AddWithValue("@time", time); cmd.Parameters.AddWithValue("@appName", appName); cmd.Parameters.AddWithValue("@appltitle", appltitle); cmd.Parameters.AddWithValue("@Elapsed_Time", appduration.ToString()); cmd.Parameters.AddWithValue("@userName", userName); cmd.ExecuteNonQuery(); reader.Close(); Conn.Close(); } } } } catch (Exception) { } //} #endregion ActivityTimer.Start(); Processing = "Working"; } Unfortunately this is the result. it is not saving the data as I expect it to. What am i doing wrong I had thought that with the sql reader it would first check for a value and only save if they do not match however it is saving whether there is a match or not.

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  • Lessons learnt in implementing Scrum in a Large Organization that has traditional values

    - by MarkPearl
    I recently had the experience of being involved in a “test” scrum implementation in a large organization that was used to a traditional project management approach. Here are some lessons that I learnt from it. Don’t let the Project Manager be the Product Owner First lesson learnt is to identify the correct product owner – in this instance the product manager assumed the role of the product owner which was a mistake. The product owner is the one who has the most to loose if the project fails. With a methodology that advocates removing the role of the project manager from the process then it is not in the interests of the person who is employed as a project manager to be the product owner – in fact they have the most to gain should the project fail. Know the time commitments of team members to the Project Second lesson learnt is to get a firm time commitment of the members on a team for the sprint and to hold them to it. In this project instance many of the issues we faced were with team members having to double up on supporting existing projects/systems and the scrum project. In many situations they just didn’t get round to doing any work on the scrum project for several days while they tried to meet other commitments. Initially this was not made transparent to the team – in stand up team members would say that had done some work but would be very vague on how much time they had actually spent using the blackhole of their other legacy projects as an excuse – putting up a time burn down chart made time allocations transparent and easy to hold the team to. In addition, how can you plan for a sprint without knowing the actual time available of the members – when I mean actual time, the exercise of getting them to go through all their appointments and lunch times and breaks and removing them from their time commitment helps get you to a realistic time that they can dedicate. Make sure you meet your minimum team sizes In a recent post I wrote about the difference between a partnership and a team. If you are going to do scrum in a large organization make sure you have a minimum team size of at least 3 developers. My experience with larger organizations is that people have a tendency to be sick more, take more leave and generally not be around – if you have a team size of two it is so easy to loose momentum on the project – the more people you have in the team (up to about 9) the more the momentum the project will have when people are not around. Swapping from one methodology to another can seem as waste to the customer It sounds bad, but most customers don’t care what methodology you use. Often they have bought into the “big plan upfront”. If you can, avoid taking a project on midstream from a traditional approach unless the customer has not bought into the process – with this particular project they had a detailed upfront planning breakaway with the customer using the traditional approach and then before the project started we moved onto a scrum implementation – this seemed as waste to the customer. We should have managed the customers expectation properly. Don’t play the role of the scrum master if you can’t be the scrum master With this particular implementation I was the “scrum master”. But all I did was go through the process of the formal meetings of scrum – I attended stand up, retrospectives and planning – but I was not hands on the ground. I was not performing the most important role of removing blockages – and by the end of the project there were a number of blockages “cropping up”. What could have been a better approach was to take someone on the team and train them to be the scrum master and be present to coach them. Alternatively actually be on the team on a fulltime basis and be the scrum master. By just going through the meetings of scrum didn’t mean we were doing scrum. So we failed with this one, if you fail look at it from an agile perspective As this particular project drew to a close and it became more and more apparent that it was not going to succeed the failure of it became depressing. Emotions were expressed by various people on the team that we not encouraging and enforced the failure. Embracing the failure and looking at it for what it is instead of taking it as the end of the world can change how you grow from the experience. Acknowledging that it failed and then focussing on learning from why and how to avoid the failure in the future can change how you feel emotionally about the team, the project and the organization.

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  • Get More Value From Your Oracle Premier Support Investment

    - by Get Proactive Customer Adoption Team
    Untitled Document The Return on Investment in Support Training I’m a typical software user. I’ve been using spreadsheets almost daily for the past 10 years or so. I know how to enter simple formulas, format cells, import files, and I can sort and filter. Sometimes I even use a pivot table. I never attended training. I learnt everything I know on the fly. Sometimes it was intuitive and easy, other times I had to spend minutes and even hours searching for a solution. Yet when I see what some other people can do with their spreadsheets, I know I’m utilizing maybe 15% of the functionality. Pity, one day I really have to sign up for training. Why haven’t I done it yet? Ah, you know, I’m a busy person, I have work to do. And if I need to use a feature that I am unfamiliar with, I’ll spend time on it only when I really need it. Now wait. When I recall how much time I spent trying to figure how things work compared to time I spent doing the productive work, I realize it was not insignificant. I’m unable to sum up all the time I spent ‘learning’ on the fly, but I’m sure it’s been days or even weeks. And after all this time, I’ve mastered 15% of its features. If only I had attended training years ago. That investment would have paid back 10 times! Working with My Oracle Support is no different. Our customers typically use simple search, create service requests, and download patches. They think they know how to use My Oracle Support. And they’re right. They know something but often they’re utilizing only a fragment of My Oracle Support’s potential. For the investment that has been made, using only a small subset of the capabilities offered in My Oracle Support leaves value on the table. There is much more available in My Oracle Support. Dozens of diagnostic tools and proactive health checks will keep verifying your Oracle environments against best practices that Oracle gathers every day thanks to our comprehensive knowledge management process. Automated patch recommendations will help prevent known issues, and upgrade planning and more is included in My Oracle Support. Why are you not utilizing all of these best practices, capabilities and tools? Is it because you don’t have time to invest 2-3 hours of your time to learn about the features? Simply because you think you can learn on the fly like I thought I could? Does learning on the fly how to properly use the Service Request escalation process when you already have critical issue sound like a good idea? My advice is: Invest your time now to learn how My Oracle Support can help you prevent issues on your systems. Learn how to find answers faster and resolve problems more efficiently. Understand how to properly complete a service request. Invest in Support training, offered at no additional cost to Oracle Premier Support customers. It will pay back quicker than you think. It will bring you more value than you think. Discover your advantage with Oracle Premier Support's Proactive Portfolio.

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  • How many bits for sequence number using Go-Back-N protocol.

    - by Mike
    Hi Everyone, I'm a regular over at Stack Overflow (Software developer) that is trying to get through a networking course. I got a homework problem I'd like to have a sanity check on. Here is what I got. Q: A 3000-km-long T1 trunk is used to transmit 64-byte frames using Go-Back-N protocol. If the propagation speed is 6 microseconds/km, how many bits should the sequence numbers be? My Answer: For this questions what we need to do is lay the base knowledge. What we are trying to find is the size of the largest sequence number we should us using Go-Back-N. To figure this out we need to figure out how many packets can fit into our link at a time and then subtract one from that number. This will ensure that we never have two packets with the same sequence number at the same time in the link. Length of link: 3,000km Speed: 6 microseconds / km Frame size: 64 bytes T1 transmission speed: 1544kb/s (http://ckp.made-it.com/t1234.html) Propagation time = 6 microseconds / km * 3000 km = 18,000 microseconds (18ms). Convert 1544kb to bytes = 1544 * 1024 = 1581056 bytes Transmission time = 64 bytes / 1581056bytes / second = 0.000040479 seconds (0.4ms) So then if we take the 18ms propagation time and divide it by the 0.4ms transmission time we will see that we are going to be able to stuff ( 18 / 0.4) 45 packets into the link at a time. That means that our sequence number should be 2 ^ 45 bits long! Am I going in the right direction with this? Thanks, Mike

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  • nokia cell phone not accepting IP from dnsmasq dhcp server

    - by samix
    Hello, I having problem connecting a NOkia cell phone to my home wifi network. The wifi network is provided by a wireless card in a machine running Debian Testing and 2.6.26-2-686 kernel. The cars is D-Link DWL-G520 working in ap mode and has WPA encryption enabled. The wireless network is provided by hostapd using madwifi driver. Windows and Mac machines work properly with this wifi network. When I try to get the Nokia phone to connect to the wifi network, I get these lines in my dnsmasq log (to see lines without wrapping, here is the pastebin link for convenience - http://pastebin.com/m466c8fd2): Oct 27 13:25:21 red hostapd: ath0: STA 11:22:33:44:55:66 IEEE 802.11: disassociated Oct 27 13:25:21 red hostapd: ath0: STA 11:22:33:44:55:66 IEEE 802.11: associated Oct 27 13:25:21 red hostapd: ath0: STA 11:22:33:44:55:66 RADIUS: starting accounting session 4AE664FA-00000036 Oct 27 13:25:21 red hostapd: ath0: STA 11:22:33:44:55:66 WPA: pairwise key handshake completed (WPA) Oct 27 13:25:21 red hostapd: ath0: STA 11:22:33:44:55:66 WPA: group key handshake completed (WPA) Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 Available DHCP range: 192.168.5.150 -- 192.168.5.199 Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 DHCPDISCOVER(ath0) 0.0.0.0 11:22:33:44:55:66 Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 DHCPOFFER(ath0) 192.168.5.21 11:22:33:44:55:66 Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 requested options: 12:hostname, 6:dns-server, 15:domain-name, Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 requested options: 1:netmask, 3:router, 28:broadcast, 120:sip-server Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 tags: known, ath0 Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 next server: 192.168.5.1 Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 sent size: 1 option: 53:message-type 02 Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 sent size: 4 option: 54:server-identifier 192.168.5.1 Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 sent size: 4 option: 51:lease-time 00:00:46:50 Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 sent size: 4 option: 58:T1 00:00:23:28 Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 sent size: 4 option: 59:T2 00:00:3d:86 Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 sent size: 4 option: 1:netmask 255.255.255.0 Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 sent size: 4 option: 28:broadcast 192.168.5.255 Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 sent size: 4 option: 3:router 192.168.5.1 Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 sent size: 4 option: 6:dns-server 192.168.5.1 Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 sent size: 8 option: 15:domain-name home.pvt Oct 27 13:25:21 red dnsmasq-dhcp[11451]: 3875439214 sent size: 3 option: 12:hostname NokiaCellPhone Anybody know the problem might be? If I switch off dnsmasq dhcp queries logging, i.e. if I decrease the verbosity of the log, all I see are two lines of DHCPDISCOVER(ath0) and DHCPOFFER(ath0) repeatedly in the log with no acceptance by the cell phone. It appears as though the phone is not accepting the dhcp offer. However, if I give the phone a static IP address in its configuration, it works properly on the wifi network. So it appears as though the problem is dhcp related. Hints? Suggestions? Installed stuff: $ dpkg -l dnsmasq hostap* | grep ^i ii dnsmasq 2.50-1 A small caching DNS proxy and DHCP/TFTP server ii dnsmasq-base 2.50-1 A small caching DNS proxy and DHCP/TFTP server ii hostapd 1:0.6.9-3 user space IEEE 802.11 AP and IEEE 802.1X/WPA/ Thanks. PS: Here is the DHCP tcp dump for more information (with mac addresses changed): $ sudo dhcpdump -i ath0 -h ^11:22:33:44:55:66 TIME: 2009-10-30 12:15:32.916 IP: 0.0.0.0 (1:22:33:44:55:66) 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 1 (BOOTPREQUEST) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: c3f93d53 SECS: 0 FLAGS: 7f80 CIADDR: 0.0.0.0 YIADDR: 0.0.0.0 SIADDR: 0.0.0.0 GIADDR: 0.0.0.0 CHADDR: 11:22:33:44:55:66:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 1 (DHCPDISCOVER) OPTION: 50 ( 4) Request IP address 0.0.0.0 OPTION: 61 ( 7) Client-identifier 01:11:22:33:44:55:66 OPTION: 55 ( 7) Parameter Request List 12 (Host name) 6 (DNS server) 15 (Domainname) 1 (Subnet mask) 3 (Routers) 28 (Broadcast address) 120 (SIP Servers DHCP Option) OPTION: 57 ( 2) Maximum DHCP message size 576 TIME: 2009-10-30 12:15:32.918 IP: 0.0.0.0 (1:22:33:44:55:66) 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 1 (BOOTPREQUEST) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: c3f93d53 SECS: 0 FLAGS: 7f80 CIADDR: 0.0.0.0 YIADDR: 0.0.0.0 SIADDR: 0.0.0.0 GIADDR: 0.0.0.0 CHADDR: 11:22:33:44:55:66:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 1 (DHCPDISCOVER) OPTION: 50 ( 4) Request IP address 0.0.0.0 OPTION: 61 ( 7) Client-identifier 01:11:22:33:44:55:66 OPTION: 55 ( 7) Parameter Request List 12 (Host name) 6 (DNS server) 15 (Domainname) 1 (Subnet mask) 3 (Routers) 28 (Broadcast address) 120 (SIP Servers DHCP Option) OPTION: 57 ( 2) Maximum DHCP message size 576 TIME: 2009-10-30 12:15:32.918 IP: 192.168.5.1 (a:bb:cc:dd:ee:ff) 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 2 (BOOTPREPLY) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: c3f93d53 SECS: 0 FLAGS: 7f80 CIADDR: 0.0.0.0 YIADDR: 192.168.5.21 SIADDR: 192.168.5.1 GIADDR: 0.0.0.0 CHADDR: 11:22:33:44:55:66:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 2 (DHCPOFFER) OPTION: 54 ( 4) Server identifier 192.168.5.1 OPTION: 51 ( 4) IP address leasetime 18000 (5h) OPTION: 58 ( 4) T1 9000 (2h30m) OPTION: 59 ( 4) T2 15750 (4h22m30s) OPTION: 1 ( 4) Subnet mask 255.255.255.0 OPTION: 28 ( 4) Broadcast address 192.168.5.255 OPTION: 3 ( 4) Routers 192.168.5.1 OPTION: 6 ( 4) DNS server 192.168.5.1 OPTION: 15 ( 8) Domainname home.pvt OPTION: 12 ( 3) Host name Nokia_E63 TIME: 2009-10-30 12:15:34.922 IP: 0.0.0.0 (1:22:33:44:55:66) 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 1 (BOOTPREQUEST) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: c3f93d53 SECS: 2 FLAGS: 7f80 CIADDR: 0.0.0.0 YIADDR: 0.0.0.0 SIADDR: 0.0.0.0 GIADDR: 0.0.0.0 CHADDR: 11:22:33:44:55:66:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 1 (DHCPDISCOVER) OPTION: 50 ( 4) Request IP address 0.0.0.0 OPTION: 61 ( 7) Client-identifier 01:11:22:33:44:55:66 OPTION: 55 ( 7) Parameter Request List 12 (Host name) 6 (DNS server) 15 (Domainname) 1 (Subnet mask) 3 (Routers) 28 (Broadcast address) 120 (SIP Servers DHCP Option) OPTION: 57 ( 2) Maximum DHCP message size 576 TIME: 2009-10-30 12:15:34.922 IP: 0.0.0.0 (1:22:33:44:55:66) 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 1 (BOOTPREQUEST) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: c3f93d53 SECS: 2 FLAGS: 7f80 CIADDR: 0.0.0.0 YIADDR: 0.0.0.0 SIADDR: 0.0.0.0 GIADDR: 0.0.0.0 CHADDR: 11:22:33:44:55:66:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 1 (DHCPDISCOVER) OPTION: 50 ( 4) Request IP address 0.0.0.0 OPTION: 61 ( 7) Client-identifier 01:11:22:33:44:55:66 OPTION: 55 ( 7) Parameter Request List 12 (Host name) 6 (DNS server) 15 (Domainname) 1 (Subnet mask) 3 (Routers) 28 (Broadcast address) 120 (SIP Servers DHCP Option) OPTION: 57 ( 2) Maximum DHCP message size 576 TIME: 2009-10-30 12:15:34.923 IP: 192.168.5.1 (a:bb:cc:dd:ee:ff) 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 2 (BOOTPREPLY) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: c3f93d53 SECS: 2 FLAGS: 7f80 CIADDR: 0.0.0.0 YIADDR: 192.168.5.21 SIADDR: 192.168.5.1 GIADDR: 0.0.0.0 CHADDR: 11:22:33:44:55:66:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 2 (DHCPOFFER) OPTION: 54 ( 4) Server identifier 192.168.5.1 OPTION: 51 ( 4) IP address leasetime 18000 (5h) OPTION: 58 ( 4) T1 9000 (2h30m) OPTION: 59 ( 4) T2 15750 (4h22m30s) OPTION: 1 ( 4) Subnet mask 255.255.255.0 OPTION: 28 ( 4) Broadcast address 192.168.5.255 OPTION: 3 ( 4) Routers 192.168.5.1 OPTION: 6 ( 4) DNS server 192.168.5.1 OPTION: 15 ( 8) Domainname home.pvt OPTION: 12 ( 3) Host name Nokia_E63 TIME: 2009-10-30 12:15:38.919 IP: 0.0.0.0 (1:22:33:44:55:66) 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 1 (BOOTPREQUEST) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: c3f93d53 SECS: 6 FLAGS: 7f80 CIADDR: 0.0.0.0 YIADDR: 0.0.0.0 SIADDR: 0.0.0.0 GIADDR: 0.0.0.0 CHADDR: 11:22:33:44:55:66:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 1 (DHCPDISCOVER) OPTION: 50 ( 4) Request IP address 0.0.0.0 OPTION: 61 ( 7) Client-identifier 01:11:22:33:44:55:66 OPTION: 55 ( 7) Parameter Request List 12 (Host name) 6 (DNS server) 15 (Domainname) 1 (Subnet mask) 3 (Routers) 28 (Broadcast address) 120 (SIP Servers DHCP Option) OPTION: 57 ( 2) Maximum DHCP message size 576 TIME: 2009-10-30 12:15:38.920 IP: 0.0.0.0 (1:22:33:44:55:66) 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 1 (BOOTPREQUEST) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: c3f93d53 SECS: 6 FLAGS: 7f80 CIADDR: 0.0.0.0 YIADDR: 0.0.0.0 SIADDR: 0.0.0.0 GIADDR: 0.0.0.0 CHADDR: 11:22:33:44:55:66:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 1 (DHCPDISCOVER) OPTION: 50 ( 4) Request IP address 0.0.0.0 OPTION: 61 ( 7) Client-identifier 01:11:22:33:44:55:66 OPTION: 55 ( 7) Parameter Request List 12 (Host name) 6 (DNS server) 15 (Domainname) 1 (Subnet mask) 3 (Routers) 28 (Broadcast address) 120 (SIP Servers DHCP Option) OPTION: 57 ( 2) Maximum DHCP message size 576 TIME: 2009-10-30 12:15:38.921 IP: 192.168.5.1 (a:bb:cc:dd:ee:ff) 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 2 (BOOTPREPLY) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: c3f93d53 SECS: 6 FLAGS: 7f80 CIADDR: 0.0.0.0 YIADDR: 192.168.5.21 SIADDR: 192.168.5.1 GIADDR: 0.0.0.0 CHADDR: 11:22:33:44:55:66:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 2 (DHCPOFFER) OPTION: 54 ( 4) Server identifier 192.168.5.1 OPTION: 51 ( 4) IP address leasetime 18000 (5h) OPTION: 58 ( 4) T1 9000 (2h30m) OPTION: 59 ( 4) T2 15750 (4h22m30s) OPTION: 1 ( 4) Subnet mask 255.255.255.0 OPTION: 28 ( 4) Broadcast address 192.168.5.255 OPTION: 3 ( 4) Routers 192.168.5.1 OPTION: 6 ( 4) DNS server 192.168.5.1 OPTION: 15 ( 8) Domainname home.pvt OPTION: 12 ( 3) Host name Nokia_E63 TIME: 2009-10-30 12:15:46.944 IP: 0.0.0.0 (1:22:33:44:55:66) 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 1 (BOOTPREQUEST) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: ccafe769 SECS: 14 FLAGS: 7f80 CIADDR: 0.0.0.0 YIADDR: 0.0.0.0 SIADDR: 0.0.0.0 GIADDR: 0.0.0.0 CHADDR: 11:22:33:44:55:66:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 1 (DHCPDISCOVER) OPTION: 50 ( 4) Request IP address 0.0.0.0 OPTION: 61 ( 7) Client-identifier 01:11:22:33:44:55:66 OPTION: 55 ( 7) Parameter Request List 12 (Host name) 6 (DNS server) 15 (Domainname) 1 (Subnet mask) 3 (Routers) 28 (Broadcast address) 120 (SIP Servers DHCP Option) OPTION: 57 ( 2) Maximum DHCP message size 576 TIME: 2009-10-30 12:15:46.944 IP: 0.0.0.0 (1:22:33:44:55:66) 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 1 (BOOTPREQUEST) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: ccafe769 SECS: 14 FLAGS: 7f80 CIADDR: 0.0.0.0 YIADDR: 0.0.0.0 SIADDR: 0.0.0.0 GIADDR: 0.0.0.0 CHADDR: 11:22:33:44:55:66:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 1 (DHCPDISCOVER) OPTION: 50 ( 4) Request IP address 0.0.0.0 OPTION: 61 ( 7) Client-identifier 01:11:22:33:44:55:66 OPTION: 55 ( 7) Parameter Request List 12 (Host name) 6 (DNS server) 15 (Domainname) 1 (Subnet mask) 3 (Routers) 28 (Broadcast address) 120 (SIP Servers DHCP Option) OPTION: 57 ( 2) Maximum DHCP message size 576 TIME: 2009-10-30 12:15:46.945 IP: 192.168.5.1 (a:bb:cc:dd:ee:ff) 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 2 (BOOTPREPLY) HTYPE: 1 (Ethernet) HLEN: 6 HOPS: 0 XID: ccafe769 SECS: 14 FLAGS: 7f80 CIADDR: 0.0.0.0 YIADDR: 192.168.5.21 SIADDR: 192.168.5.1 GIADDR: 0.0.0.0 CHADDR: 11:22:33:44:55:66:00:00:00:00:00:00:00:00:00:00 SNAME: . FNAME: . OPTION: 53 ( 1) DHCP message type 2 (DHCPOFFER) OPTION: 54 ( 4) Server identifier 192.168.5.1 OPTION: 51 ( 4) IP address leasetime 18000 (5h) OPTION: 58 ( 4) T1 9000 (2h30m) OPTION: 59 ( 4) T2 15750 (4h22m30s) OPTION: 1 ( 4) Subnet mask 255.255.255.0 OPTION: 28 ( 4) Broadcast address 192.168.5.255 OPTION: 3 ( 4) Routers 192.168.5.1 OPTION: 6 ( 4) DNS server 192.168.5.1 OPTION: 15 ( 8) Domainname home.pvt OPTION: 12 ( 3) Host name Nokia_E63 TIME: 2009-10-30 12:15:48.952 IP: 0.0.0.0 (1:22:33:44:55:66) 255.255.255.255 (ff:ff:ff:ff:ff:ff) OP: 1 (BOOTPREQUEST) HTYPE: 1 (Ethernet) HLEN: 6 ... and so on ...

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  • iPod touch has extremely slow wifi, drops packets - only on my router

    - by mskfisher
    I just purchased an iPod Touch. I am having a lot of trouble with its speeds on my Tenda W311R, but it has no speed problems on my neighbor's Netgear router. It will connect and authenticate to my network, but the Speed Test app from speedtest.net shows rates near 20-50 kbps. If I run the speed test immediately after powering the iPod on, it will get speeds of 10-20 Mbps, like it should - but the speeds slow down to the kbps range abut 10-15 seconds afterward. I get the same behavior with encryption and without encryption, and regardless of N, G, or B compatibility settings in the router. I've tried rebooting the iPod and resetting the network settings, but it's still slow. I've tried pinging the iPod from another computer, and it shows about 40% packet loss: $ ping 192.168.0.111 PING 192.168.0.111 (192.168.0.111): 56 data bytes 64 bytes from 192.168.0.111: icmp_seq=0 ttl=64 time=14.188 ms 64 bytes from 192.168.0.111: icmp_seq=1 ttl=64 time=11.556 ms 64 bytes from 192.168.0.111: icmp_seq=2 ttl=64 time=5.675 ms 64 bytes from 192.168.0.111: icmp_seq=3 ttl=64 time=5.721 ms Request timeout for icmp_seq 4 64 bytes from 192.168.0.111: icmp_seq=5 ttl=64 time=6.491 ms Request timeout for icmp_seq 6 64 bytes from 192.168.0.111: icmp_seq=7 ttl=64 time=8.065 ms Request timeout for icmp_seq 8 Request timeout for icmp_seq 9 Request timeout for icmp_seq 10 64 bytes from 192.168.0.111: icmp_seq=11 ttl=64 time=9.605 ms Signal strength is good - I'm never more than 20 feet from my access point, and it exhibits the same behavior if I'm standing next to the router. It works just well enough to receive text, but videos don't work at all. App downloads are hit and miss. I've tweaked just about all of the settings I can see to tweak, and I'm at a loss. I have also been searching Google for the past three days, all to no avail. Any suggestions?

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  • How to achieve the following RTO & RPO with logshipping only using SQL Server?

    - by Jimmy Chandra
    Trying to come up with viable backup restore & logshipping solution for achieving the following: 15 minutes Recovery Point Objective (no more than 15 minutes data loss at any time) 5 minutes Recovery Time Objective (must be able to get the db up and running back by 5 minutes) Considering using logshipping only (which I think is kind of pushing it, but I want to know if anyone else know how to achieve this). Some other info for consideration: Using 40 Gbit / sec fiber channel between the primary and disaster recovery (DRC) sites The sites are about 600 km apart. At close of business, the amount of data generated is predicted to be about 150 MB/sec. Log backup is planned for every 5 min. Doing some rough calculation I came up w/ the following numbers: 40 Gbit / sec = 5 MB / sec @ 100% network efficiency. 5 MB / sec = 300 MB / min. @ 300 MB / min, the total amount of data that can be transfer considering the 5min RTO is about 1.5GB, but that will left no time for the actual backup and restore, so if we cut it down to 3min logshipping time, which equals to ~900 MB over 3 minutes at 100% network efficiency, that will left about 1 min backup time and 1 minute restore time. Currently don't have any information if the system being used is capable of restoring 900 MB in 1 min, but assume it can. for COB scenario... 150 MB/sec, and considering the 3 min logshipping time, which should equal to about 27 GB of data over 3 mins...??? I think this is where the SLA will break... since there is no way to transfer 27 GB of data over a 40Gbit/sec line in 3 min. Can I get someone else opinion? I am thinking database mirroring might be a better answer for this...

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  • How to debug slow queries in Django+Postgres

    - by lacker
    My database queries from Django are starting to take 1-2 seconds and I'm having trouble figuring out why. Not too big a site, about 1-2 requests per second (that hit Django; static files are just served from nginx.) The thing that confuses me is, I can replicate the slowness in the Django shell using debug mode. But when I issue the exact same queries at an sql prompt they are fast. It takes about a second for a query to return, but when I check connection.queries it reports the time as under 10 ms. Here's an example (from the Django shell): >>> p = PlayerData.objects.get(uid="100000521952372") >>> a = time.time(); p.save(); print time.time() - a 1.96812295914 >>> for d in connection.queries: print d["time"] ... 0.002 0.000 0.000 How can I figure out where this extra time is being spent? I'm using Apache+mod_wsgi in daemon mode, but this happens with just the django shell as well, so I figure it is not apache-related.

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  • AWS elastic load balancer basic issues

    - by Jones
    I have an array of EC2 t1.micro instances behind a load balancer and each node can manage ~100 concurrent users before it starts to get wonky. i would THINK if i have 2 such instances it would allow my network to manage 200 concurrent users... apparently not. When i really slam the server (blitz.io) with a full 275 concurrents, it behaves the same as if there is just one node. it goes from 400ms response time to 1.6 seconds (which for a single t1.micro is expected, but not 6). So the question is, am i simply not doing something right or is ELB effectively worthless? Anyone have some wisdom on this? AB logs: Loadbalancer (3x m1.medium) Document Path: /ping/index.html Document Length: 185 bytes Concurrency Level: 100 Time taken for tests: 11.668 seconds Complete requests: 50000 Failed requests: 0 Write errors: 0 Non-2xx responses: 50001 Total transferred: 19850397 bytes HTML transferred: 9250185 bytes Requests per second: 4285.10 [#/sec] (mean) Time per request: 23.337 [ms] (mean) Time per request: 0.233 [ms] (mean, across all concurrent requests) Transfer rate: 1661.35 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 1 2 4.3 2 63 Processing: 2 21 15.1 19 302 Waiting: 2 21 15.0 19 261 Total: 3 23 15.7 21 304 Single instance (1x m1.medium direct connection) Document Path: /ping/index.html Document Length: 185 bytes Concurrency Level: 100 Time taken for tests: 9.597 seconds Complete requests: 50000 Failed requests: 0 Write errors: 0 Non-2xx responses: 50001 Total transferred: 19850397 bytes HTML transferred: 9250185 bytes Requests per second: 5210.19 [#/sec] (mean) Time per request: 19.193 [ms] (mean) Time per request: 0.192 [ms] (mean, across all concurrent requests) Transfer rate: 2020.01 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 1 9 128.9 3 3010 Processing: 1 10 8.7 9 141 Waiting: 1 9 8.7 8 140 Total: 2 19 129.0 12 3020

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  • How can I disable 'natural breaks' in Workrave?

    - by Pixelastic
    I've just discovered Workrave, and was trying to use it along the Pomodoro technique (5mn break every 25mn). But the concept of 'natural breaks' of Workrave seems to interfere with what I'm trying to achieve. Workrave tries to guess that I'm doing a natural break if I stop using my mouse and keyboard for longer than 5s. It then stops the work timer, and start counting time as if I was doing my break. Here is a typical example : I've configured a 5mn rest break every 25mn. I start working. 10mn later, I receive a phone call, or start talking with a colleague, or any work-related action that do not need either keyboard nor mouse. Workrave then stops counting my time as work time, and starts its rest timer. If my phone call is shorter than 5mn, then Workrave will resume its timer where it stopped it. Meaning that my time on the phone is not counted as work time, and so my break time is pushed a few minutes later than it should be. Even worse, if my phone call is longer than 5mn, then Workrave count it as a complete rest break, and when I'll resume working, it will restart its timer completly. I'm looking for either a way to disable the natural breaks, or increase the 'inactivity time' from 5s to maybe ~1mn. Or maybe an other angle to look at the natural breaks that might work with the Pomodoro technique (forced 5mn breaks every 25mn). I'm using Ubuntu 11.10.

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  • Expire Files In A Folder: Delete Files After x Days

    - by Brett G
    I'm looking to make a "Drop Folder" in a windows shared drive that is accessible to everyone. I'd like files to be deleted automagically if they sit in the folder for more than X days. However, it seems like all methods I've found to do this, use the last modified date, last access time, or creation date of a file. I'm trying to make this a folder that a user can drop files in to share with somebody. If someone copies or moves files into here, I'd like the clock to start ticking at this point. However, the last modified date and creation date of a file will not be updated unless someone actually modifies the file. The last access time is updated too frequently... it seems that just opening a directory in windows explorer will update the last access time. Anyone know of a solution to this? I'm thinking that cataloging the hash of files on a daily basis and then expiring files based on hashes older than a certain date might be a solution.... but taking hashes of files can be time consuming. Any ideas would be greatly appreciated! Note: I've already looked at quite a lot of answers on here... looked into File Server Resource Monitor, powershell scripts, batch scripts, etc. They still use the last access time, last modified time or creation time... which, as described, do not fit the above needs.

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  • How to create basic Adobe Illustrator files programatically?

    - by Jonas Follesø
    I need to create a really basic Adobe Illustrator file on the clipboard that I can paste in Adobe Illustrator or Expression Design. I'm looking for code samples on how to programaticaly generate Adobe Illustrator Files, preferably from C# or some other .NET language (but at the moment any language goes). I have found the Adobe Illustrator 3 File Format documentation online but it's allot to digest for this simple scenario. I don't want to depend on the actual Adobe Illustrator program (COM interop for instance) to generate my documents. Must be pure code. The code is for an Expression Studio addin, and I need to be able to create something on the clipboard I can paste into Expression Design. After looking at the formats Expression Design puts on the clipboard when copying a basic shape I've concluded that ADOBE AI3 i the best one to use (the others are either rendered images, or cfXaml that you cannot paste INTO Design). So based on this I can't use SWG which would probably been easier. Another idea might be to use a PDF component as the AI and PDF format is supposed to be compatible? I'm also finding some references to a format called "Adobe Illustrator Clipboard Format" (AICB), but can't find allot of documentation about it.

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  • Focussing on Style Sheets and Cross Browser Compatibility.

    - by Sam
    Hello everyone, Let me begin this topic by explaining my background experience with web design. I have always been more of a back end programmer, with PHP and SQL and things. However I do have a shallow background with HTML and CSS. The problem is, I don't know it all. What I do know is, when it comes to designing (not back end dirty work) I understand basic CSS properties and I also understand HTML and I can usually throw together a sloppy web page with the two and a couple bazillion DIV tags. Anyways.. The problem I always have encountered is that when I design a website in a browser such as IE7 (and then it looks perfect on IE7), and then look at it on IE8 or IE6 or Mozilla (etc.) it gets all spacey and ugly and looks totally different than the way it should look on IE7. Question one: Basically, what I am asking everyone is what route should I take to learn how to properly build the website? Build as in put it togehter with CSS standards and HTML standards that will make my site look the same on every brwoser. (Not only learning standards but where can I learn to properly write my code?) Where is a strong free resource I can use to learn how to these things? Question two: How do I properly code my website? Do I use all external style sheets to make dynamic page design simplistic or do I hard code some things into the DIV tags on each page? What is proper? Oh, and if anyone has any tutorials on how to properly design a complete layout feel free to throw it in a response somewhere. Thank you for taking the time to read my questions, and hopefully you will understand what I am trying to get out to everyone. I need to get on the right route of the designing side of web programming so that I will know how to create successful websites in the future. Thank you, Sam Pardee

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  • Seperating Javascript and Html, when dynamically adding html via javascript

    - by optician
    I am currently building a very dynamic table for a list application, which will basically perform basic CRUD functions via AJAX. What I would like to do is separate the visual design and javascript to the point where I can change the design side without touching the JS side. This would only work where the design stays roughly the same(i would like to use it for rapid protyping) Here is an example. <table> <tr><td>record-123</td><td>I am line 123</td><td>delete row</td></tr> <tr><td>record-124</td><td>I am line 124</td><td>delete row</td></tr> <tr><td>record-125</td><td>I am line 125</td><td>delete row</td></tr> <tr><td>add new record</td></tr> </table> Now, when I add a new record, I would like to insert a new row of html, but I would rather not put this html into the javascript file. What I am considering is creating a row like this on the page, near the table. <tr style='visble:none;' id='template-row'><td>record-id</td><td>content-area</td><td>delete row</td></tr> And when I come to add the new row, I search the page for the tags with the id=template-row , and then grab it, do a string replace on it, and then put it in the right place in the page. As long as the design doesn't shift radically, and I keep the placeholder strings the same, it means designs can be quickly modified without touching the js. Can any give any advice on a methodology like this?

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  • Text mining on large database (data mining)

    - by yox
    Hello, I have a large database of resumes (CV), and a certain table skills grouping all users skills. inside that table there's a field skill_text that describes the skill in full text. I'm looking for an algorithm/software/method to extract significant terms/phrases from that table in order to build a new table with standarized skills.. Here are some examples skills extracted from the DB : Sectoral and competitive analysis Business Development (incl. in international settings) Specific structure and road design software - Microstation, Macao, AutoCAD (basic knowledge) Creative work (Photoshop, In-Design, Illustrator) checking and reporting back on campaign progress organising and attending events and exhibitions Development : Aptana Studio, PHP, HTML, CSS, JavaScript, SQL, AJAX Discipline: One to one marketing, E-marketing (SEO & SEA, display, emailing, affiliate program) Mix marketing, Viral Marketing, Social network marketing. The output shoud be something like : Sectoral and competitive analysis Business Development Specific structure and road design software - Macao AutoCAD Photoshop In-Design Illustrator organising events Development Aptana Studio PHP HTML CSS JavaScript SQL AJAX Mix marketing Viral Marketing Social network marketing emailing SEO One to one marketing As you see only skills remains no other representation text. I know this is possible using text mining technics but how to do it ? the database is realy large.. it's a good thing because we can calculate text frequency and decide if it's a real skill or just meaningless text... The big problem is .. how to determin that "blablabla" is a skill ? thanks

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  • Separating Javascript and Html, when dynamically adding html via javascript

    - by optician
    I am currently building a very dynamic table for a list application, which will basically perform basic CRUD functions via AJAX. What I would like to do is separate the visual design and javascript to the point where I can change the design side without touching the JS side. This would only work where the design stays roughly the same(i would like to use it for rapid protyping) Here is an example. <table> <tr><td>record-123</td><td>I am line 123</td><td>delete row</td></tr> <tr><td>record-124</td><td>I am line 124</td><td>delete row</td></tr> <tr><td>record-125</td><td>I am line 125</td><td>delete row</td></tr> <tr><td>add new record</td></tr> </table> Now, when I add a new record, I would like to insert a new row of html, but I would rather not put this html into the javascript file. What I am considering is creating a row like this on the page, near the table. <tr style='visble:none;' id='template-row'><td>record-id</td><td>content-area</td><td>delete row</td></tr> And when I come to add the new row, I search the page for the tags with the id=template-row , and then grab it, do a string replace on it, and then put it in the right place in the page. As long as the design doesn't shift radically, and I keep the placeholder strings the same, it means designs can be quickly modified without touching the js. Can any give any advice on a methodology like this?

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  • How can I make an AdvancedDataGrid re-display its labels when the results of the labelFunction chang

    - by Chris R
    I have an AdvancedDataGrid with a custom label function whose value can change based on other form status (specifically, there's a drop down to choose the time display format for some columns). Right now, I have this labelFunction: internal function formatColumnTime(item: Object, column: AdvancedDataGridColumn): String { var seconds: Number = item[column.dataField]; return timeFormat.selectedItem.labelFunction(seconds); } internal function formatTimeAsInterval(time: Number): String { if (isNaN(time)) return ""; var integerTime: int = Math.round(time); var seconds: int = integerTime % 60; integerTime = integerTime / 60; var minutes: int = integerTime % 60; var hours: int = integerTime / 60; return printf("%02d:%02d:%02d", hours, minutes, seconds); } internal function formatTimeAsFractions(time: Number): String { if (isNaN(time)) return ""; var hours: Number = time / 3600.0; return new String(Math.round(hours * 100) / 100); } ... and the timeFormat object is a combo box with items whose labelFunction attributes are formatTimeAsFractions and formatTimeAsInterval. The columns that have time formats have formatColumnTime as their labelFunction value, because extracting the seconds in that function and passing it in to the formatters made for a more testable app (IMHO). So, when the timeFormat.selectedItem value changes, I want to force my grid to re-calculate the labels of these colums. What method must I call on it? invalidateProperties() didn't work, so that's out.

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  • Search multiple datepicker on same grid

    - by DHF
    I'm using multiple datepicker on same grid and I face the problem to get a proper result. I used 3 datepicker in 1 grid. Only the first datepicker (Order Date)is able to output proper result while the other 2 datepicker (Start Date & End Date) are not able to generate proper result. There is no problem with the query, so could you find out what's going on here? Thanks in advance! php wrapper <?php ob_start(); require_once 'config.php'; // include the jqGrid Class require_once "php/jqGrid.php"; // include the PDO driver class require_once "php/jqGridPdo.php"; // include the datepicker require_once "php/jqCalendar.php"; // Connection to the server $conn = new PDO(DB_DSN,DB_USER,DB_PASSWORD); // Tell the db that we use utf-8 $conn->query("SET NAMES utf8"); // Create the jqGrid instance $grid = new jqGridRender($conn); // Write the SQL Query $grid->SelectCommand = "SELECT c.CompanyID, c.CompanyCode, c.CompanyName, c.Area, o.OrderCode, o.Date, m.maID ,m.System, m.Status, m.StartDate, m.EndDate, m.Type FROM company c, orders o, maintenance_agreement m WHERE c.CompanyID = o.CompanyID AND o.OrderID = m.OrderID "; // Set the table to where you update the data $grid->table = 'maintenance_agreement'; // set the ouput format to json $grid->dataType = 'json'; // Let the grid create the model $grid->setPrimaryKeyId('maID'); // Let the grid create the model $grid->setColModel(); // Set the url from where we obtain the data $grid->setUrl('grouping_ma_details.php'); // Set grid caption using the option caption $grid->setGridOptions(array( "sortable"=>true, "rownumbers"=>true, "caption"=>"Group by Maintenance Agreement", "rowNum"=>20, "height"=>'auto', "width"=>1300, "sortname"=>"maID", "hoverrows"=>true, "rowList"=>array(10,20,50), "footerrow"=>false, "userDataOnFooter"=>false, "grouping"=>true, "groupingView"=>array( "groupField" => array('CompanyName'), "groupColumnShow" => array(true), //show or hide area column "groupText" =>array('<b> Company Name: {0}</b>',), "groupDataSorted" => true, "groupSummary" => array(true) ) )); if(isset($_SESSION['login_admin'])) { $grid->addCol(array( "name"=>"Action", "formatter"=>"actions", "editable"=>false, "sortable"=>false, "resizable"=>false, "fixed"=>true, "width"=>60, "formatoptions"=>array("keys"=>true), "search"=>false ), "first"); } // Change some property of the field(s) $grid->setColProperty("CompanyID", array("label"=>"ID","hidden"=>true,"width"=>30,"editable"=>false,"editoptions"=>array("readonly"=>"readonly"))); $grid->setColProperty("CompanyName", array("label"=>"Company Name","hidden"=>true,"editable"=>false,"width"=>150,"align"=>"center","fixed"=>true)); $grid->setColProperty("CompanyCode", array("label"=>"Company Code","hidden"=>true,"width"=>50,"align"=>"center")); $grid->setColProperty("OrderCode", array("label"=>"Order Code","width"=>110,"editable"=>false,"align"=>"center","fixed"=>true)); $grid->setColProperty("maID", array("hidden"=>true)); $grid->setColProperty("System", array("width"=>150,"fixed"=>true,"align"=>"center")); $grid->setColProperty("Type", array("width"=>280,"fixed"=>true)); $grid->setColProperty("Status", array("width"=>70,"align"=>"center","edittype"=>"select","editoptions"=>array("value"=>"Yes:Yes;No:No"),"fixed"=>true)); $grid->setSelect('System', "SELECT DISTINCT System, System AS System FROM master_ma_system ORDER BY System", false, true, true, array(""=>"All")); $grid->setSelect('Type', "SELECT DISTINCT Type, Type AS Type FROM master_ma_type ORDER BY Type", false, true, true, array(""=>"All")); $grid->setColProperty("StartDate", array("label"=>"Start Date","width"=>120,"align"=>"center","fixed"=>true, "formatter"=>"date", "formatoptions"=>array("srcformat"=>"Y-m-d H:i:s","newformat"=>"d M Y") )); // this is only in this case since the orderdate is set as date time $grid->setUserTime("d M Y"); $grid->setUserDate("d M Y"); $grid->setDatepicker("StartDate",array("buttonOnly"=>false)); $grid->datearray = array('StartDate'); $grid->setColProperty("EndDate", array("label"=>"End Date","width"=>120,"align"=>"center","fixed"=>true, "formatter"=>"date", "formatoptions"=>array("srcformat"=>"Y-m-d H:i:s","newformat"=>"d M Y") )); // this is only in this case since the orderdate is set as date time $grid->setUserTime("d M Y"); $grid->setUserDate("d M Y"); $grid->setDatepicker("EndDate",array("buttonOnly"=>false)); $grid->datearray = array('EndDate'); $grid->setColProperty("Date", array("label"=>"Order Date","width"=>100,"editable"=>false,"align"=>"center","fixed"=>true, "formatter"=>"date", "formatoptions"=>array("srcformat"=>"Y-m-d H:i:s","newformat"=>"d M Y") )); // this is only in this case since the orderdate is set as date time $grid->setUserTime("d M Y"); $grid->setUserDate("d M Y"); $grid->setDatepicker("Date",array("buttonOnly"=>false)); $grid->datearray = array('Date'); // This command is executed after edit $maID = jqGridUtils::GetParam('maID'); $Status = jqGridUtils::GetParam('Status'); $StartDate = jqGridUtils::GetParam('StartDate'); $EndDate = jqGridUtils::GetParam('EndDate'); $Type = jqGridUtils::GetParam('Type'); // This command is executed immediatley after edit occur. $grid->setAfterCrudAction('edit', "UPDATE maintenance_agreement SET m.Status=?, m.StartDate=?, m.EndDate=?, m.Type=? WHERE m.maID=?", array($Status,$StartDate,$EndDate,$Type,$maID)); $selectorder = <<<ORDER function(rowid, selected) { if(rowid != null) { jQuery("#detail").jqGrid('setGridParam',{postData:{CompanyID:rowid}}); jQuery("#detail").trigger("reloadGrid"); // Enable CRUD buttons in navigator when a row is selected jQuery("#add_detail").removeClass("ui-state-disabled"); jQuery("#edit_detail").removeClass("ui-state-disabled"); jQuery("#del_detail").removeClass("ui-state-disabled"); } } ORDER; // We should clear the grid data on second grid on sorting, paging, etc. $cleargrid = <<<CLEAR function(rowid, selected) { // clear the grid data and footer data jQuery("#detail").jqGrid('clearGridData',true); // Disable CRUD buttons in navigator when a row is not selected jQuery("#add_detail").addClass("ui-state-disabled"); jQuery("#edit_detail").addClass("ui-state-disabled"); jQuery("#del_detail").addClass("ui-state-disabled"); } CLEAR; $grid->setGridEvent('onSelectRow', $selectorder); $grid->setGridEvent('onSortCol', $cleargrid); $grid->setGridEvent('onPaging', $cleargrid); $grid->setColProperty("Area", array("width"=>100,"hidden"=>false,"editable"=>false,"fixed"=>true)); $grid->setColProperty("HeadCount", array("label"=>"Head Count","align"=>"center", "width"=>100,"hidden"=>false,"fixed"=>true)); $grid->setSelect('Area', "SELECT DISTINCT AreaName, AreaName AS Area FROM master_area ORDER BY AreaName", false, true, true, array(""=>"All")); $grid->setSelect('CompanyName', "SELECT DISTINCT CompanyName, CompanyName AS CompanyName FROM company ORDER BY CompanyName", false, true, true, array(""=>"All")); $custom = <<<CUSTOM jQuery("#getselected").click(function(){ var selr = jQuery('#grid').jqGrid('getGridParam','selrow'); if(selr) { window.open('http://www.smartouch-cdms.com/order.php?CompanyID='+selr); } else alert("No selected row"); return false; }); CUSTOM; $grid->setJSCode($custom); // Enable toolbar searching $grid->toolbarfilter = true; $grid->setFilterOptions(array("stringResult"=>true,"searchOnEnter"=>false,"defaultSearch"=>"cn")); // Enable navigator $grid->navigator = true; // disable the delete operation programatically for that table $grid->del = false; // we need to write some custom code when we are in delete mode. // get the grid operation parameter to see if we are in delete mode // jqGrid sends the "oper" parameter to identify the needed action $deloper = $_POST['oper']; // det the company id $cid = $_POST['CompanyID']; // if the operation is del and the companyid is set if($deloper == 'del' && isset($cid) ) { // the two tables are linked via CompanyID, so let try to delete the records in both tables try { jqGridDB::beginTransaction($conn); $comp = jqGridDB::prepare($conn, "DELETE FROM company WHERE CompanyID= ?", array($cid)); $cont = jqGridDB::prepare($conn,"DELETE FROM contact WHERE CompanyID = ?", array($cid)); jqGridDB::execute($comp); jqGridDB::execute($cont); jqGridDB::commit($conn); } catch(Exception $e) { jqGridDB::rollBack($conn); echo $e->getMessage(); } } // Enable only deleting if(isset($_SESSION['login_admin'])) { $grid->setNavOptions('navigator', array("pdf"=>true, "excel"=>true,"add"=>false,"edit"=>true,"del"=>false,"view"=>true, "search"=>true)); } else $grid->setNavOptions('navigator', array("pdf"=>true, "excel"=>true,"add"=>false,"edit"=>false,"del"=>false,"view"=>true, "search"=>true)); // In order to enable the more complex search we should set multipleGroup option // Also we need show query roo $grid->setNavOptions('search', array( "multipleGroup"=>false, "showQuery"=>true )); // Set different filename $grid->exportfile = 'Company.xls'; // Close the dialog after editing $grid->setNavOptions('edit',array("closeAfterEdit"=>true,"editCaption"=>"Update Company","bSubmit"=>"Update","dataheight"=>"auto")); $grid->setNavOptions('add',array("closeAfterAdd"=>true,"addCaption"=>"Add New Company","bSubmit"=>"Update","dataheight"=>"auto")); $grid->setNavOptions('view',array("Caption"=>"View Company","dataheight"=>"auto","width"=>"1100")); ob_end_clean(); //solve TCPDF error // Enjoy $grid->renderGrid('#grid','#pager',true, null, null, true,true); $conn = null; ?> javascript code jQuery(document).ready(function ($) { jQuery('#grid').jqGrid({ "width": 1300, "hoverrows": true, "viewrecords": true, "jsonReader": { "repeatitems": false, "subgrid": { "repeatitems": false } }, "xmlReader": { "repeatitems": false, "subgrid": { "repeatitems": false } }, "gridview": true, "url": "session_ma_details.php", "editurl": "session_ma_details.php", "cellurl": "session_ma_details.php", "sortable": true, "rownumbers": true, "caption": "Group by Maintenance Agreement", "rowNum": 20, "height": "auto", "sortname": "maID", "rowList": [10, 20, 50], "footerrow": false, "userDataOnFooter": false, "grouping": true, "groupingView": { "groupField": ["CompanyName"], "groupColumnShow": [false], "groupText": ["<b> Company Name: {0}</b>"], "groupDataSorted": true, "groupSummary": [true] }, "onSelectRow": function (rowid, selected) { if (rowid != null) { jQuery("#detail").jqGrid('setGridParam', { postData: { CompanyID: rowid } }); jQuery("#detail").trigger("reloadGrid"); // Enable CRUD buttons in navigator when a row is selected jQuery("#add_detail").removeClass("ui-state-disabled"); jQuery("#edit_detail").removeClass("ui-state-disabled"); jQuery("#del_detail").removeClass("ui-state-disabled"); } }, "onSortCol": function (rowid, selected) { // clear the grid data and footer data jQuery("#detail").jqGrid('clearGridData', true); // Disable CRUD buttons in navigator when a row is not selected jQuery("#add_detail").addClass("ui-state-disabled"); jQuery("#edit_detail").addClass("ui-state-disabled"); jQuery("#del_detail").addClass("ui-state-disabled"); }, "onPaging": function (rowid, selected) { // clear the grid data and footer data jQuery("#detail").jqGrid('clearGridData', true); // Disable CRUD buttons in navigator when a row is not selected jQuery("#add_detail").addClass("ui-state-disabled"); jQuery("#edit_detail").addClass("ui-state-disabled"); jQuery("#del_detail").addClass("ui-state-disabled"); }, "datatype": "json", "colModel": [ { "name": "Action", "formatter": "actions", "editable": false, "sortable": false, "resizable": false, "fixed": true, "width": 60, "formatoptions": { "keys": true }, "search": false }, { "name": "CompanyID", "index": "CompanyID", "sorttype": "int", "label": "ID", "hidden": true, "width": 30, "editable": false, "editoptions": { "readonly": "readonly" } }, { "name": "CompanyCode", "index": "CompanyCode", "sorttype": "string", "label": "Company Code", "hidden": true, "width": 50, "align": "center", "editable": true }, { "name": "CompanyName", "index": "CompanyName", "sorttype": "string", "label": "Company Name", "hidden": true, "editable": false, "width": 150, "align": "center", "fixed": true, "edittype": "select", "editoptions": { "value": "Aquatex Industries:Aquatex Industries;Benithem Sdn Bhd:Benithem Sdn Bhd;Daily Bakery Sdn Bhd:Daily Bakery Sdn Bhd;Eurocor Asia Sdn Bhd:Eurocor Asia Sdn Bhd;Evergrown Technology:Evergrown Technology;Goldpar Precision:Goldpar Precision;MicroSun Technologies Asia:MicroSun Technologies Asia;NCI Industries Sdn Bhd:NCI Industries Sdn Bhd;PHHP Marketing:PHHP Marketing;Smart Touch Technology:Smart Touch Technology;THOSCO Treatech:THOSCO Treatech;YHL Trading (Johor) Sdn Bhd:YHL Trading (Johor) Sdn Bhd;Zenxin Agri-Organic Food:Zenxin Agri-Organic Food", "separator": ":", "delimiter": ";" }, "stype": "select", "searchoptions": { "value": ":All;Aquatex Industries:Aquatex Industries;Benithem Sdn Bhd:Benithem Sdn Bhd;Daily Bakery Sdn Bhd:Daily Bakery Sdn Bhd;Eurocor Asia Sdn Bhd:Eurocor Asia Sdn Bhd;Evergrown Technology:Evergrown Technology;Goldpar Precision:Goldpar Precision;MicroSun Technologies Asia:MicroSun Technologies Asia;NCI Industries Sdn Bhd:NCI Industries Sdn Bhd;PHHP Marketing:PHHP Marketing;Smart Touch Technology:Smart Touch Technology;THOSCO Treatech:THOSCO Treatech;YHL Trading (Johor) Sdn Bhd:YHL Trading (Johor) Sdn Bhd;Zenxin Agri-Organic Food:Zenxin Agri-Organic Food", "separator": ":", "delimiter": ";" } }, { "name": "Area", "index": "Area", "sorttype": "string", "width": 100, "hidden": true, "editable": false, "fixed": true, "edittype": "select", "editoptions": { "value": "Cemerlang:Cemerlang;Danga Bay:Danga Bay;Kulai:Kulai;Larkin:Larkin;Masai:Masai;Nusa Cemerlang:Nusa Cemerlang;Nusajaya:Nusajaya;Pasir Gudang:Pasir Gudang;Pekan Nenas:Pekan Nenas;Permas Jaya:Permas Jaya;Pontian:Pontian;Pulai:Pulai;Senai:Senai;Skudai:Skudai;Taman Gaya:Taman Gaya;Taman Johor Jaya:Taman Johor Jaya;Taman Molek:Taman Molek;Taman Pelangi:Taman Pelangi;Taman Sentosa:Taman Sentosa;Tebrau 4:Tebrau 4;Ulu Tiram:Ulu Tiram", "separator": ":", "delimiter": ";" }, "stype": "select", "searchoptions": { "value": ":All;Cemerlang:Cemerlang;Danga Bay:Danga Bay;Kulai:Kulai;Larkin:Larkin;Masai:Masai;Nusa Cemerlang:Nusa Cemerlang;Nusajaya:Nusajaya;Pasir Gudang:Pasir Gudang;Pekan Nenas:Pekan Nenas;Permas Jaya:Permas Jaya;Pontian:Pontian;Pulai:Pulai;Senai:Senai;Skudai:Skudai;Taman Gaya:Taman Gaya;Taman Johor Jaya:Taman Johor Jaya;Taman Molek:Taman Molek;Taman Pelangi:Taman Pelangi;Taman Sentosa:Taman Sentosa;Tebrau 4:Tebrau 4;Ulu Tiram:Ulu Tiram", "separator": ":", "delimiter": ";" } }, { "name": "OrderCode", "index": "OrderCode", "sorttype": "string", "label": "Order No.", "width": 110, "editable": false, "align": "center", "fixed": true }, { "name": "Date", "index": "Date", "sorttype": "date", "label": "Order Date", "width": 100, "editable": false, "align": "center", "fixed": true, "formatter": "date", "formatoptions": { "srcformat": "Y-m-d H:i:s", "newformat": "d M Y" }, "editoptions": { "dataInit": function(el) { setTimeout(function() { if (jQuery.ui) { if (jQuery.ui.datepicker) { jQuery(el).datepicker({ "disabled": false, "dateFormat": "dd M yy" }); jQuery('.ui-datepicker').css({ 'font-size': '75%' }); } } }, 100); } }, "searchoptions": { "dataInit": function(el) { setTimeout(function() { if (jQuery.ui) { if (jQuery.ui.datepicker) { jQuery(el).datepicker({ "disabled": false, "dateFormat": "dd M yy" }); jQuery('.ui-datepicker').css({ 'font-size': '75%' }); } } }, 100); } } }, { "name": "maID", "index": "maID", "sorttype": "int", "key": true, "hidden": true, "editable": true }, { "name": "System", "index": "System", "sorttype": "string", "width": 150, "fixed": true, "align": "center", "edittype": "select", "editoptions": { "value": "Payroll:Payroll;TMS:TMS;TMS & Payroll:TMS & Payroll", "separator": ":", "delimiter": ";" }, "stype": "select", "searchoptions": { "value": ":All;Payroll:Payroll;TMS:TMS;TMS & Payroll:TMS & Payroll", "separator": ":", "delimiter": ";" }, "editable": true }, { "name": "Status", "index": "Status", "sorttype": "string", "width": 70, "align": "center", "edittype": "select", "editoptions": { "value": "Yes:Yes;No:No" }, "fixed": true, "editable": true }, { "name": "StartDate", "index": "StartDate", "sorttype": "date", "label": "Start Date", "width": 120, "align": "center", "fixed": true, "formatter": "date", "formatoptions": { "srcformat": "Y-m-d H:i:s", "newformat": "d M Y" }, "editoptions": { "dataInit": function(el) { setTimeout(function() { if (jQuery.ui) { if (jQuery.ui.datepicker) { jQuery(el).datepicker({ "disabled": false, "dateFormat": "dd M yy" }); jQuery('.ui-datepicker').css({ 'font-size': '75%' }); } } }, 100); } }, "searchoptions": { "dataInit": function(el) { setTimeout(function() { if (jQuery.ui) { if (jQuery.ui.datepicker) { jQuery(el).datepicker({ "disabled": false, "dateFormat": "dd M yy" }); jQuery('.ui-datepicker').css({ 'font-size': '75%' }); } } }, 100); } }, "editable": true }, { "name": "EndDate", "index": "EndDate", "sorttype": "date", "label": "End Date", "width": 120, "align": "center", "fixed": true, "formatter": "date", "formatoptions": { "srcformat": "Y-m-d H:i:s", "newformat": "d M Y" }, "editoptions": { "dataInit": function(el) { setTimeout(function() { if (jQuery.ui) { if (jQuery.ui.datepicker) { jQuery(el).datepicker({ "disabled": false, "dateFormat": "dd M yy" }); jQuery('.ui-datepicker').css({ 'font-size': '75%' }); } } }, 100); } }, "searchoptions": { "dataInit": function(el) { setTimeout(function() { if (jQuery.ui) { if (jQuery.ui.datepicker) { jQuery(el).datepicker({ "disabled": false, "dateFormat": "dd M yy" }); jQuery('.ui-datepicker').css({ 'font-size': '75%' }); } } }, 100); } }, "editable": true }, { "name": "Type", "index": "Type", "sorttype": "string", "width": 530, "fixed": true, "edittype": "select", "editoptions": { "value": "Comprehensive MA:Comprehensive MA;FOC service, 20% spare part discount:FOC service, 20% spare part discount;Standard Package, FOC 1 time service, 20% spare part discount:Standard Package, FOC 1 time service, 20% spare part discount;Standard Package, FOC 2 time service, 20% spare part discount:Standard Package, FOC 2 time service, 20% spare part discount;Standard Package, FOC 3 time service, 20% spare part discount:Standard Package, FOC 3 time service, 20% spare part discount;Standard Package, FOC 4 time service, 20% spare part discount:Standard Package, FOC 4 time service, 20% spare part discount;Standard Package, FOC 6 time service, 20% spare part discount:Standard Package, FOC 6 time service, 20% spare part discount;Standard Package, no free:Standard Package, no free", "separator": ":", "delimiter": ";" }, "stype": "select", "searchoptions": { "value": ":All;Comprehensive MA:Comprehensive MA;FOC service, 20% spare part discount:FOC service, 20% spare part discount;Standard Package, FOC 1 time service, 20% spare part discount:Standard Package, FOC 1 time service, 20% spare part discount;Standard Package, FOC 2 time service, 20% spare part discount:Standard Package, FOC 2 time service, 20% spare part discount;Standard Package, FOC 3 time service, 20% spare part discount:Standard Package, FOC 3 time service, 20% spare part discount;Standard Package, FOC 4 time service, 20% spare part discount:Standard Package, FOC 4 time service, 20% spare part discount;Standard Package, FOC 6 time service, 20% spare part discount:Standard Package, FOC 6 time service, 20% spare part discount;Standard Package, no free:Standard Package, no free", "separator": ":", "delimiter": ";" }, "editable": true } ], "postData": { "oper": "grid" }, "prmNames": { "page": "page", "rows": "rows", "sort": "sidx", "order": "sord", "search": "_search", "nd": "nd", "id": "maID", "filter": "filters", "searchField": "searchField", "searchOper": "searchOper", "searchString": "searchString", "oper": "oper", "query": "grid", "addoper": "add", "editoper": "edit", "deloper": "del", "excel": "excel", "subgrid": "subgrid", "totalrows": "totalrows", "autocomplete": "autocmpl" }, "loadError": function(xhr, status, err) { try { jQuery.jgrid.info_dialog(jQuery.jgrid.errors.errcap, '<div class="ui-state-error">' + xhr.responseText + '</div>', jQuery.jgrid.edit.bClose, { buttonalign: 'right' } ); } catch(e) { alert(xhr.responseText); } }, "pager": "#pager" }); jQuery('#grid').jqGrid('navGrid', '#pager', { "edit": true, "add": false, "del": false, "search": true, "refresh": true, "view": true, "excel": true, "pdf": true, "csv": false, "columns": false }, { "drag": true, "resize": true, "closeOnEscape": true, "dataheight": "auto", "errorTextFormat": function (r) { return r.responseText; }, "closeAfterEdit": true, "editCaption": "Update Company", "bSubmit": "Update" }, { "drag": true, "resize": true, "closeOnEscape": true, "dataheight": "auto", "errorTextFormat": function (r) { return r.responseText; }, "closeAfterAdd": true, "addCaption": "Add New Company", "bSubmit": "Update" }, { "errorTextFormat": function (r) { return r.responseText; } }, { "drag": true, "closeAfterSearch": true, "multipleSearch": true }, { "drag": true, "resize": true, "closeOnEscape": true, "dataheight": "auto", "Caption": "View Company", "width": "1100" } ); jQuery('#grid').jqGrid('navButtonAdd', '#pager', { id: 'pager_excel', caption: '', title: 'Export To Excel', onClickButton: function (e) { try { jQuery("#grid").jqGrid('excelExport', { tag: 'excel', url: 'session_ma_details.php' }); } catch (e) { window.location = 'session_ma_details.php?oper=excel'; } }, buttonicon: 'ui-icon-newwin' }); jQuery('#grid').jqGrid('navButtonAdd', '#pager', { id: 'pager_pdf', caption: '', title: 'Export To Pdf', onClickButton: function (e) { try { jQuery("#grid").jqGrid('excelExport', { tag: 'pdf', url: 'session_ma_details.php' }); } catch (e) { window.location = 'session_ma_details.php?oper=pdf'; } }, buttonicon: 'ui-icon-print' }); jQuery('#grid').jqGrid('filterToolbar', { "stringResult": true, "searchOnEnter": false, "defaultSearch": "cn" }); jQuery("#getselected").click(function () { var selr = jQuery('#grid').jqGrid('getGridParam', 'selrow'); if (selr) { window.open('http://www.smartouch-cdms.com/order.php?CompanyID=' + selr); } else alert("No selected row"); return false; }); });

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  • SQL Server CLR stored procedures in data processing tasks - good or evil?

    - by Gart
    In short - is it a good design solution to implement most of the business logic in CLR stored procedures? I have read much about them recently but I can't figure out when they should be used, what are the best practices, are they good enough or not. For example, my business application needs to parse a large fixed-length text file, extract some numbers from each line in the file, according to these numbers apply some complex business rules (involving regex matching, pattern matching against data from many tables in the database and such), and as a result of this calculation update records in the database. There is also a GUI for the user to select the file, view the results, etc. This application seems to be a good candidate to implement the classic 3-tier architecture: the Data Layer, the Logic Layer, and the GUI layer. The Data Layer would access the database The Logic Layer would run as a WCF service and implement the business rules, interacting with the Data Layer The GUI Layer would be a means of communication between the Logic Layer and the User. Now, thinking of this design, I can see that most of the business rules may be implemented in a SQL CLR and stored in SQL Server. I might store all my raw data in the database, run the processing there, and get the results. I see some advantages and disadvantages of this solution: Pros: The business logic runs close to the data, meaning less network traffic. Process all data at once, possibly utilizing parallelizm and optimal execution plan. Cons: Scattering of the business logic: some part is here, some part is there. Questionable design solution, may encounter unknown problems. Difficult to implement a progress indicator for the processing task. I would like to hear all your opinions about SQL CLR. Does anybody use it in production? Are there any problems with such design? Is it a good thing?

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