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  • How can I see logs in a server after a kernel panic hang ?

    - by Low Kian Seong
    I am running a production gentoo Linux machine, and recently there was a situation where the server hung in my co-located premises and when I got there I noticed that the server was hung on what appeared to be a kernel panic hang. I rebooted the machine with a hard reboot and was disappointed to find out that I could not find a shred of evidence anywhere on why the machine hung. Is it true that when I do a hard reboot the messages itself will get lost or is there a setting I can do somewhere say in syslog-ng or maybe in sysctl to at least preserve the error log so that I can prevent such mishaps from happening in the future ? I am running a 2.6.x kernel by the way. Thanks in advance.

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  • Advice on designing a robust program to handle a large library of meta-information & programs

    - by Sam Bryant
    So this might be overly vague, but here it is anyway I'm not really looking for a specific answer, but rather general design principles or direction towards resources that deal with problems like this. It's one of my first large-scale applications, and I would like to do it right. Brief Explanation My basic problem is that I have to write an application that handles a large library of meta-data, can easily modify the meta-data on-the-fly, is robust with respect to crashing, and is very efficient. (Sorta like the design parameters of iTunes, although sometimes iTunes performs more poorly than I would like). If you don't want to read the details, you can skip the rest Long Explanation Specifically I am writing a program that creates a library of image files and meta-data about these files. There is a list of tags that may or may not apply to each image. The program needs to be able to add new images, new tags, assign tags to images, and detect duplicate images, all while operating. The program contains an image Viewer which has tagging operations. The idea is that if a given image A is viewed while the library has tags T1, T2, and T3, then that image will have boolean flags for each of those tags (depending on whether the user tagged that image while it was open in the Viewer). However, prior to being viewed in the Viewer, image A would have no value for tags T1, T2, and T3. Instead it would have a "dirty" flag indicating that it is unknown whether or not A has these tags or not. The program can introduce new tags at any time (which would automatically set all images to "dirty" with respect to this new tag) This program must be fast. It must be easily able to pull up a list of images with or without a certain tag as well as images which are "dirty" with respect to a tag. It has to be crash-safe, in that if it suddenly crashes, all of the tagging information done in that session is not lost (though perhaps it's okay to loose some of it) Finally, it has to work with a lot of images (10,000) I am a fairly experienced programmer, but I have never tried to write a program with such demanding needs and I have never worked with databases. With respect to the meta-data storage, there seem to be a few design choices: Choice 1: Invidual meta-data vs centralized meta-data Individual Meta-Data: have a separate meta-data file for each image. This way, as soon as you change the meta-data for an image, it can be written to the hard disk, without having to rewrite the information for all of the other images. Centralized Meta-Data: Have a single file to hold the meta-data for every file. This would probably require meta-data writes in intervals as opposed to after every change. The benefit here is that you could keep a centralized list of all images with a given tag, ect, making the task of pulling up all images with a given tag very efficient

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  • change default port of IIS and let another process to listen on port 80 (Windows Server 2008)

    - by aleroot
    I have an installation of Windows Server 2008 running IIS 6 with a website listening on port 8080, even though I have moved the website to listen on 8080, port 80 is still kept in use by IIS (for truth by the kernel process : System - ProcId : 4). I want to let another process listen on port 80 without uninstalling or disabling IIS, I want to keep IIS listening on port 8080 and another service on port 80, is there a way to do it? I saw another similar thread here on serverfault but the solution (using httpcfg.exe delete iplisten -i 0.0.0.0:80 ) can work only in 2003 because in 2008 the utility httpcfg.exe doesn't exist and it seems that it cannot be installed ... Does anyone have a solution to get rid of the kernel listening on port 80 in Windows Server 2008 with IIS running?

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  • PASS Summit 2012 PreCon - DBA-298-P Automate and Manage SQL Server with PowerShell

    - by AllenMWhite
    On Tuesday I presented an all-day pre-conference session on using PowerShell to automate and manage SQL Server. It was a very full day and we had a lot of great questions. One discussion in Module 6 was around scripting all the objects in a database, and I'd mentioned the script I wrote for the book The Red Gate Guide to SQL Server Team-based Development . When putting together the demos for the attendees to download I realized I'd placed that script in the Module 6 folder, so you don't need to go...(read more)

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  • Installation of MS SQL Database 2005 on Windows XP Home Sp3 fails with no specific error

    - by PiotrK
    I am trying to install MS SQL Database 2005 on Windows XP Home SP3. It fails giving no reason ("Database failed to install"), then exits. I had already installed MS SQL Database Express Edition 2008 during 2005 setup. But when I removed 2008 one and tried to install 2005 afterwards it still failed with same error. The error happens when I am trying to install Dragon Age Toolset or Visual 2008 Pro edition. I do not known which else informations may be valuable as I never before encountered problems with installing MS database

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  • Prioritize One Network Share Over Another And/Or Cap Network Share Traffic? (Windows Server 2008 R2 Enterprise)

    - by FullTimeCoderPartTimeSysAdmin
    One of my fileservers is a hyper v VM running Windows Server 2008 R2 Enterprise. The NIC in the VM maps to a 1 GB NIC on the host that is dedicated just to this VM. I have two shares on the file server. One is very important and used by a few users. The other is less important but used by many users. The issue I'm having: When a ton of users are accessing the unimportant share, it can choke out requests to the important share. What I'd like to do: I'd like to some prioritize requests for for file on the more important share, or even dedicate a portion of the NIC's bandwidth just to requests for files on that share. Is there any way to do that? Alternately, can I add another NIC and specify that all traffic to one share goes over one NIC and traffic to the other share goes over the other?

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  • problem with crating table on phpMyAdmin database

    - by tombull89
    Hello all, I'm running a phpMyAdmin Database on my web package on a 1and1-hosted server. I've managed to set up a database in the control panel, have uploaded all to root/phpmyadmin and changed the config.ini.php file to point at 1and1's database server (because that's the way they do it). I can go to the web interface and get to the main page, but all it shows is the database name and I can't find how to create any tables. I know it's a long shot but I'm almost out of ideas. Also, 1and1 have their own phpmyadmin panel, which is pretty annoying to use, and a 1and1 webdatabase which I have barely looked at. Help and suggestions much appriciated.

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  • SQL SERVER – Free eBook Download – EPUB, MOBI, PDF Format

    - by pinaldave
    Microsoft has released recently free eBooks on various Microsoft Technology. The best part is that all these books are available in ePub, Mobi and PDF. You can download them to your local machine or eBook reader and read them. This is a great start as many important subjects are now covered and converted into an eBook. I personally read through a few of the books and found they are very comprehensive and and detailed. The goal is not to cover complete technology in a single book but rather pick a single topic and discuss it in detail. The source of the book is white paper, Technet wiki as well book online and it is clearly listed right bellow the book title. Following are the books available for SQL Server Technology and I encourage all of you to have a look at them as they are great resources. Master Data Services Capacity Guidelines Microsoft SQL Server AlwaysOn Solutions Guide for High Availability and Disaster Recovery Microsoft SQL Server Analysis Services Multidimensional Performance and Operations Guide QuickStart: Learn DAX Basics in 30 Minutes SQL Server 2012 Transact-SQL DML Reference You can download above eBooks from here. This is indeed a great attempt as each book talks about the a single subject in depth keeping author focus on the single and simple subject. I have previously written two books by focusing on the same subject and I had great pleasure writing it as well. Writing on focus subjects gives complete freedom to author to explore the a single subject without having burden to cover everything which is associated with that technology at large. Just like eBooks mentioned earlier my SQL Server Wait Stats was inspired from my article series on SQL Wait Stats. The latest book SQL Server Interview Question and Answers was derived from my article series on SQL Interview Q and A. Writing book is an absolutely different concept than writing blog posts. When I was converting my blog posts to books, I ended up writing 50% new material and end up removing many repetitive content which shows up in blog series. It was indeed fun to focused book at the same time it was a great learning experience as an individual. Reference: TechNet Wiki, Pinal Dave (http://blog.SQLAuthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Documentation, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Should all foreign table references use foreign key constraints

    - by TecBrat
    Closely related to: Foreign key restrictions -> yes or no? I asked a question on SO and it led me to ask this here. If I'm faced with a choice of having a circular reference or just not enforcing the restraint, which is the better choice? In my particular case I have customers and addresses. I want an address to have a reference to a customer and I want each customer to have a default billing address id and a default shipping address id. I might query for all addresses that have a certain customer ID or I might query for the address with the ID that matches the default shipping or billing address ids. I'm not sure yet how the constraints (or lack of) will effect the system as my application and it's data age.

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  • Taking advantage of an "Intel Turbo Memory" card for swap or fast bootup

    - by Brian Ballsun-Stanton
    I have an X61 thinkpad (currently running 10.10) that I purchased 3 years ago. I splurged a little and got a Turbo Memory expansion to improve my windows boots. When I installed 10.04 (and subsquently upgraded to 10.10) there was no Turbo Memory support and there's an awful lot of noise on searches. 1) Is there any support for Intel Turbo Memory in 11.04 or trivially compilable into the kernel as swap, suspend, hibernate point, or boot partition? 2) If there is, should I bother trying to use it?

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  • SQL SERVER – Weekly Series – Memory Lane – #004

    - by pinaldave
    Here is the list of curetted articles of SQLAuthority.com across all these years. Instead of just listing all the articles I have selected a few of my most favorite articles and have listed them here with additional notes below it. Let me know which one of the following is your favorite article from memory lane. 2006 Auto Generate Script to Delete Deprecated Fields in Current Database In early career everytime I have to drop a column, I had hard time doing it because I was scared what if that column was needed somewhere in the code. Due to this fear I never dropped any column. I just renamed the column. If the column which I renamed was needed afterwards it was very easy to rename it back again. However, it is not recommended to keep the deleted column renamed in the database. At every interval I used to drop the columns which was prefixed with specific word. This script is 6 years old but still works. Give it a look, I am open for improvements. 2007 Shrinking Truncate Log File – Log Full – Part 2 Shrinking database or mdf file is indeed bad thing and it creates lots of problems. However, once in a while there is legit requirement to shrink the log file – a very rare one. In the rare occasion shrinking or truncating the log file may be the only solution. However, one should make sure to take backup before and after the truncate or shrink as in case of a disaster they can be very useful. Remember that truncating log file will break the log chain and while restore it can create major issue. Anyway, use this feature with caution. 2008 Simple Use of Cursor to Print All Stored Procedures of Database Including Schema This is a very interesting requirement I used to face in my early career days, I needed to print all the Stored procedures of my database. Interesting enough I had written a cursor to do so. Today when I look back at this stored procedure, I believe there will be a much cleaner way to do the same task, however, I still use this SP quite often when I have to document all the stored procedures of my database. Interesting Observation about Order of Resultset without ORDER BY In industry many developers avoid using ORDER BY clause to display the result in particular order thinking that Index is enforcing the order. In this interesting example, I demonstrate that without using ORDER BY, same table and similar query can return different results. Query optimizer always returns results using any method which is optimized for performance. The learning is There is no order unless ORDER BY is used. 2009 Size of Index Table – A Puzzle to Find Index Size for Each Index on Table I asked this puzzle earlier where I asked how to find the Index size for each of the tables. The puzzle was very well received and lots of interesting answers were received. To answer this question I have written following blog posts. I suggest this weekend you try to solve this problem and see if you can come up with a better solution. If not, well here are the solutions. Solution 1 | Solution 2 | Solution 3 Understanding Table Hints with Examples Hints are options and strong suggestions specified for enforcement by the SQL Server query processor on DML statements. The hints override any execution plan the query optimizer might select for a query. The SQL Server Query optimizer is a very smart tool and it makes a better selection of execution plan. Suggesting hints to the Query Optimizer should be attempted when absolutely necessary and by experienced developers who know exactly what they are doing (or in development as a way to experiment and learn). Interesting Observation – TOP 100 PERCENT and ORDER BY I have seen developers and DBAs using TOP very causally when they have to use the ORDER BY clause. Theoretically, there is no need of ORDER BY in the view at all. All the ordering should be done outside the view and view should just have the SELECT statement in it. It was quite common that to save this extra typing by including ordering inside of the view. At several instances developers want a complete resultset and for the same they include TOP 100 PERCENT along with ORDER BY, assuming that this will simulate the SELECT statement with ORDER BY. 2010 SQLPASS Nov 8-11, 2010-Seattle – An Alternative Look at Experience In year 2010 I attended most prestigious SQL Server event SQLPASS between Nov 8-11, 2010 at Seattle. I have only one expression for the event - Best Summit Ever. Instead of writing about my usual routine or the event, I wrote about the interesting things I did and how I felt about it! When I go back and read it, I feel that this is the best event I attended in year 2010. Change Database Access to Single User Mode Using SSMS Image says all. 2011 SQL Server 2012 has introduced new analytic functions. These functions were long awaited and I am glad that they are now here. Before when any of this function was needed, people used to write long T-SQL code to simulate these functions. But now there’s no need of doing so. Having available native function also helps performance as well readability. Function SQLAuthority MSDN CUME_DIST CUME_DIST CUME_DIST FIRST_VALUE FIRST_VALUE FIRST_VALUE LAST_VALUE LAST_VALUE LAST_VALUE LEAD LEAD LEAD LAG LAG LAG PERCENTILE_CONT PERCENTILE_CONT PERCENTILE_CONT PERCENTILE_DISC PERCENTILE_DISC PERCENTILE_DISC PERCENT_RANK PERCENT_RANK PERCENT_RANK Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Memory Lane, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Is there a good, free, online database application?

    - by andygrunt
    Google docs doesn't have a database app (yet) but can anyone point me to a good, free, online substitute? It'll be for simple things like a database of my DVD collection and I'd want to be able to import/export using standard file formats and add/edit fields of existing databses. By the way, I'm not interested in using a spreadsheet as a database.

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  • What is the advantage of a programmers VM apart from portability

    - by user619818
    I can understand the benefits of Java running on a JVM. Portability. Nice simple reason. But I have always been puzzled as to why Microsoft brought out their own version of a JVM - .NET. C# is supposed to be a fine language (haven't used myself) but could Microsoft have launched product to use native. ie to generate an exe? My colleague is learning F#. The reason it has to be a language which runs on .NET is because the Microsoft Lync API which will be used is only available on .NET. ie there is no C API for Lync. A cynical view may be that the reason is vendor lockin. F# will only run on a Microsoft platform (or C# for that matter) and so program is locked in. But maybe I am missing some other benefit of a VM platform?

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  • Developing a live video-streaming website

    - by cawecoy
    I'm a computer science student and know a little about some technology to start developing my website, like PHP, RubyOnRails and Python, and MySQL and PostgreSQL for Database. I need to know what are the best (secure, stable, low-price, etc) to get started, based on my business information: My website will be a live video-streaming one, similar to livestream.com We need to provide a secure service for our customers. They need to have a page to create and configure their own Live-Streaming-Videos, get statistics, etc. We work with Wowza Media Server ruuning on an Apache Server In addition, I would like to know some good practices for this kind of website development, as I am new to this. Thanks in advance!

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  • Relationships in a Chen ERD

    - by Nibroc A Rehpotsirhc
    I am working on a Chen ERD to model our organizations merchandise. Our central entity is a Style. We have supplemental entities of Color and Season. I am defining our assortment as the relationship between these three entities, and this relationship itself will have attributes and is defined by the three entities which participate in the mandatory relationship. The rules are; Many Styles can be offered in a Season, and a Style can be offered in many Seasons. Within a Season, a Style can be offered in Many Colors. I then have 2 other entities, one of which I believe is a weak entity, Climate, and the other may be weak, but I am not sure, this being Transaction Channel. I am thinking of these as relationships off of a relationship? Meaning, for a given Style/Color combination offered in a Season, it can be available through 1 or more Transaction Channels. Additionally, within a season, a given Style/Color combination can be intended for 1 or more Climates. Is it valid to have relationships off of relationships? Or does this requirement dictate that I should think of this Style/Color/Season relationship as an entity itself, and define the relationships to Climate and Transaction Channel off of this entity?

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  • How to setup Database Permissions on SqlServer Express 2008

    - by Timo Willemsen
    I'm using a code-first approach of using the Entity Framework. When I first run the application it will try to create the database matching my MVC models. However, it doesn't have permission to create it I think. I get the following error: CREATE DATABASE permission denied in database 'master'. What user is trying to access the SqlServer and how can I add it's permissions to let it work? This is the connectionstring I'm using (which should be right...) <add name="ContextDb" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;initial catalog=ContextDb" providerName="System.Data.SqlClient"/> Cheers

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  • Why many designs ignore normalization in RDBMS?

    - by Yosi
    I got to see many designs that normalization wasn't the first consideration in decision making phase. In many cases those designs included more than 30 columns, and the main approach was "to put everything in the same place" According to what I remember normalization is one of the first, most important things, so why is it dropped so easily sometimes? Edit: Is it true that good architects and experts choose a denormalized design while non-experienced developers choose the opposite? What are the arguments against starting your design with normalization in mind?

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  • windows server backup 2008 R2 - what is generating all the change data?

    - by bobjandal
    We have a small relatively idle windows server 2008 R2 installation that does basic filesharing and exchange for about 10 not very active users. When running a windows server backup, the incremental data daily is about 20GB. This is not coming from users shared files, nor from changes in their mailbox sizes. The total size of the installation is 249GB, which is mostly old files. Where is all this data coming from, and how can I reduce it ? Using online backup of the vhd file from the backup is taking a while because of this daily change. Is there some way I can at least see what files are changing and contributing to this data ? Options I can think of but am not sure about: 1) pagefile churning - altho the backup does not include the pagefile, perhaps the changed blocks left behind are included ? 2) logs or something ? but the installation size stays the same every day 3) should I zero free space using sdelete before backing up perhaps ?

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  • Advantage of Software Development [on hold]

    - by user93319
    The worth of a brand that a corporation carries is way too high than its physical presence. If you are venturing into an online business, you need to take special care about the corporate image of your business. Nowadays, it is very important for every organization to have its own website. To enhance the online presence of a company it is important to have a good website design as well as the blueprint of the design. A quality site can enhance organizational growth and it can lend a hand an in achieving company’s goals promptly. When websites have gained so much meaning, it is advisable for an organization to seek professional support for the construction of its own exclusive portals. Expert help may again is essential when one needs for a complete renovation on the Web. Any group is necessary to do a bit of introspection before it make a decision to look for the services of a professional web software development company. It is good to be completely clear-headed regarding one’s requirements. To start with, a business should be familiar with who its potential clientele are. Once this main factor has been give consideration, an association can go ahead and get its website designed accordingly. On approaching a corporation that offers software development services India to its customers, a client can make sure that their site is ready with all the most up-to-date features. Professional Assistance Matters Professional service supplier is identified to furnish a site with easy to use features that prompt visitors to come back again and again. Yet one more benefit of receiving aid from professionals is that they can let you know of the type of content that you should place on display over your site. For example, a business that wants to draw the interest of experts belong to the corporate world must make sure that the language used on its website is crisp and official.

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  • Create device receive SMS parse to text ( SMS Gateway )

    - by Chris Okyen
    I want to use a server as a device to run a script to parse a SMS text in the following way. I. The person types in a specific and special cell phone number (Similar to Facebook’s 32556 number used to post on your wall) II. The user types a text message. III. The user sends the text message. IV. The message is sent to some kind of Device (the server) or SMS Gateway and receives it. V. The thing described above that the message is sent to then parse the test message. I understand that these three question will mix Programming and Server Stuff and could reside here or at DBA.SE How would I make such a cell phone number (described in step I) that would be sent to the Device? How do I create the device that then would receive it? Finally, how do I Parse the text message? I don't want to pay for cloud space, server scripting stuff or server space; I want to just use a free webserver to do this totally free - meaning I will have to do more on my own... My question can be seen in more depth in this visual flowchart

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  • Problem with creating table on phpMyAdmin database

    - by tombull89
    Hello all, I'm running a phpMyAdmin Database on my web package on a 1and1-hosted server. I've managed to set up a database in the control panel, have uploaded all to root/phpmyadmin and changed the config.ini.php file to point at 1and1's database server (because that's the way they do it). I can go to the web interface and get to the main page, but all it shows is the database name and I can't find how to create any tables. I know it's a long shot but I'm almost out of ideas. Also, 1and1 have their own phpmyadmin panel, which is pretty annoying to use, and a 1and1 webdatabase which I have barely looked at. Help and suggestions much appriciated.

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  • Vmware cpu allocation for a spiking database server

    - by user1552172
    I have a database server with many poorly written queries that causes the sql server to spike then drop constantly ( a massive start from scratch is happening). I need to know if the cpu allocation on the vm to expand as needed is best practice for a case like this. I am wondering if the esxi platform cant expand as fast as the spikes happen. I am curious what is best practice for vm cpu allocation on sql server (with horribly written queries)

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  • How can you predict the time it will take for two processes in two different machines in a cluster to communicate?

    - by Dokkat
    I am trying to develop a computing application which needs a lot of memory (500gb). Buying a single machine for that is overly expensive. I can, though, buy ~100 small instances on Digital Ocean or similar, divide the memory in blocks and use TCP to emulate shared memory between the instances. Now, my question is: how can I measure/predict the time it will take for two processes in two different machines like that to share information, in comparison to IPC and shared memory? Are there rules of thumb? I don't want exact values, but knowing more or less how much faster one is would be very helpful in visualising the feasibility of this approach.

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