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• String or binary data would be truncated -- Heisenberg problem

  - by harpo

  When you get this error, the first thing you ask is, which column? Unfortunately, SQL Server is no help here. So you start doing trial and error. Well, right now I have a statement like: INSERT tbl (A, B, C, D, E, F, G) SELECT A, B * 2, C, D, E, q.F, G FROM tbl ,othertable q WHERE etc etc Note that Some values are modified or linked in from another table, but most values are coming from the original table, so they can't really cause truncation going back to the same field (that I know of). Eliminating fields one at a time eventually makes the error go away, if I do it cumulatively, but — and here's the kicker — it doesn't matter which fields I eliminate. It's as if SQL Server is objecting to the total length of the row, which I doubt, since there are only about 40 fields in all, and nothing large. Anyone ever seen this before? Thanks. UPDATE: I have also done "horizontal" testing, by filtering out the SELECT, with much the same result. In other words, if I say WHERE id BETWEEN 1 AND 100: Error WHERE id BETWEEN 1 AND 50: No error WHERE id BETWEEN 50 AND 100: No error I tried many combinations, and it cannot be limited to a single row.

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• QNAP TS-419p as a VPN Gateway?

  - by heisenberg

  Hello, I am hoping one of you might be able to help. I want to make files stored on shared folders on a QNAP TS-409p available to users over a VPN link. How is the possible? Can someone explain what I need to do. What do I need to do at the router and what do I need to do on the QNAP NAS? Effectively, what I want do do is use the built in Windows vpn client to connect to my home network and then be able to browse the shared folders. Thanks in advance.

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• Can I use boost library for crossplatform application executing?

  - by Heisenberg

  Is there any WinAPI WinExec analog in boost (c++) libraries? I need to run executable from my program, and pass parameters to it. Should I use any other cross-platform libraries for this, or handle myself what OS my program is compiled for?

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• Private Cloud: Putting some method behind the madness

  - by Sudip Datta

  Finally, I decided to join the blogging community. And what could be a better time to start than the week after OpenWorld 2012. 50K+ attendees, demonstrations, speaker sessions and a whole lot of buzz on Oracle Cloud..It was raining clouds in this year's Openworld. I am not here to write about Oracle's cloud strategy in general, but on Enterprise Manager's cloud management capabilities. This year's Openworld was the first after we announced the 12c Cloud Control and we were happy to share the stage with quite a few early adopters. Stay tuned for videos from our customers and partners, I will post them as they get published. I met a number of platform administrators in Oracle-DBAs, Middleware Admins, SOA Admins...The cloud has affected them all, at least to the point where it beckoned more than just curiosity..Most IT infrastructure are already heavily virtualized (on VMWare and on others including Oracle VM), and some would claim they are already on “cloud” (at least their Sysadmins told them so). But none of them were confident of the benefits because their pain points continued to grow.. Isn't cloud supposed to ease those? Instead, they were chasing hundreds of databases running on hundreds of VMs, often with as much certainty propounded by Heisenberg. What happened to the age-old IT discipline around administration, compliance, configuration management? VMs are great for what they are. I personally think they have opened the doors to new approaches in which an application stack gets provisioned and updated. In fact, Enterprise Manager 12c is possibly the only tool out there that can provision full-fledged application as VM Assemblies. In this year's Openworld, customers talked on how they provisioned RAC and Siebel assemblies, which as the techies out there know, are not trivial (hearing provisioning time for Siebel down from weeks to hours was gratifying indeed). However, I do have an issue with a "one-size fits all" approach to cloud. In a week's span, I met several personas: Project owners requiring an EC2 like VM instance for their projects Admins needing the same for Sparc-Solaris. DBAs requiring dedicated databases for new projects APEX Developers needing just a ready-to-consume schema as a service Java Developers looking for a runtime platform QA engineers needing a fast clone of their production environment If you drill down further, you will end up peeling more layers of the details. For example, the requirements for Load testing and Functional testing are very different. For Load testing the test environment should ideally be the same as the production. You shouldn't run production on Exadata and load test on a VM; they will just not be good representations of one another. For Functional testing it does not possibly matter. DBAs seem to be at the worst affected of the lot. It seems they have been asked to choose between agile provisioning and  faster runtime performance. And in some cases, it is really a Hobson's choice, because their infrastructure provider made no distinction between the OLTP application and the Virtual desktop! Sad indeed. When one looks at the portfolio of services that we already offer (vanilla IaaS, VM Assembly based PaaS, DBaaS) or have announced (Java PaaS, Instant Cloning, Schema-aaS), one can possibly think that we are trying to be the "renaissance man" ! Well I would have possibly digested that had it not been for the various personas that I described above. Getting the use cases right is very important for an application such as cloud management. We iterate and iterate over these over and over again and re-validate them in CABs (Customer Advisory Boards). We consider over the major aspects of tenancy: service placement, resource isolation (can a tenant execute an expensive SQL and run away with all the resources), quota and security. We, in Engineering, keep reminding ourselves that we are dealing with enterprise clouds. We owe it to our customer base ! In the coming posts, I will drill down more into each of the services. In the meanwhile, here are some collateral and  demos for starters with EM 12c. http://www.oracle.com/technetwork/oem/cloud-mgmt/index.html Sudip Datta The views expressed here are my own and do not necessarily reflect the views of Oracle. Stay Connected: Twitter | Facebook | YouTube | Linkedin | Newsletter --

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• measure rendered html in javascript without affecting the measurement

  - by drawnonward

  I am doing pagination in javascript. This is typographic pagination, not chopping up database results. For the most part it works, but I have run into a heisenberg issue where I cannot quite measure text without affecting it. I am not trying to measure text before it is rendered. I want the actual position it shows up at on screen, so I can paginate to where it is naturally wrapped. I am measuring the vertical position of characters, not the horizontal width of strings. The way I do this is similar to this answer in that I am applying a style to a block of text, then measuring the position of the newly created span. If the span does not reach the end of the page, I clear it and make a new span in a linear search. The problem is that the anti-aliased sub-pixel text layout is different when the span is applied. In rare cases, this causes the text to wrap differently when I measure it. I have only seen this when wrapping at a hyphen, and I assume it would not happen when wrapping at white space. As a concrete example, "prepared-he" is the string I am having trouble with. When I measure up to "prepare" it appears, as expected, to be within the current page. When I measure "prepared" the whole phrase wraps down to the next line, moving it to the next page, so it looks like the "d" is the character to break at. I break the text between "prepare" and "d-he" and that is wrong. Trying to evaluate individual characters opens a whole can of worms I would rather avoid. The wrapping changes because, with the new span, the line is 1 pixel wider. A solution to my problem could either be a better way to measure text using javascript, or a way to wrap text in a new element without affecting layout. I have tried setting margin-right:-1px for the class of the span being created to wrap the text. This had no noticeable effect. I am doing this in a UIWebView on the iPhone. There are some measurement related calls that are available in normal WebKit that are not available here. For example, Range does not have getBoundingClientRect or support setting an offset other than 0 in setStart or setEnd. Thank you

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• Performance Optimization – It Is Faster When You Can Measure It

  - by Alois Kraus

  Performance optimization in bigger systems is hard because the measured numbers can vary greatly depending on the measurement method of your choice. To measure execution timing of specific methods in your application you usually use Time Measurement Method Potential Pitfalls Stopwatch Most accurate method on recent processors. Internally it uses the RDTSC instruction. Since the counter is processor specific you can get greatly different values when your thread is scheduled to another core or the core goes into a power saving mode. But things do change luckily: Intel's Designer's vol3b, section 16.11.1 "16.11.1 Invariant TSC The time stamp counter in newer processors may support an enhancement, referred to as invariant TSC. Processor's support for invariant TSC is indicated by CPUID.80000007H:EDX[8]. The invariant TSC will run at a constant rate in all ACPI P-, C-. and T-states. This is the architectural behavior moving forward. On processors with invariant TSC support, the OS may use the TSC for wall clock timer services (instead of ACPI or HPET timers). TSC reads are much more efficient and do not incur the overhead associated with a ring transition or access to a platform resource." DateTime.Now Good but it has only a resolution of 16ms which can be not enough if you want more accuracy.   Reporting Method Potential Pitfalls Console.WriteLine Ok if not called too often. Debug.Print Are you really measuring performance with Debug Builds? Shame on you. Trace.WriteLine Better but you need to plug in some good output listener like a trace file. But be aware that the first time you call this method it will read your app.config and deserialize your system.diagnostics section which does also take time.   In general it is a good idea to use some tracing library which does measure the timing for you and you only need to decorate some methods with tracing so you can later verify if something has changed for the better or worse. In my previous article I did compare measuring performance with quantum mechanics. This analogy does work surprising well. When you measure a quantum system there is a lower limit how accurately you can measure something. The Heisenberg uncertainty relation does tell us that you cannot measure of a quantum system the impulse and location of a particle at the same time with infinite accuracy. For programmers the two variables are execution time and memory allocations. If you try to measure the timings of all methods in your application you will need to store them somewhere. The fastest storage space besides the CPU cache is the memory. But if your timing values do consume all available memory there is no memory left for the actual application to run. On the other hand if you try to record all memory allocations of your application you will also need to store the data somewhere. This will cost you memory and execution time. These constraints are always there and regardless how good the marketing of tool vendors for performance and memory profilers are: Any measurement will disturb the system in a non predictable way. Commercial tool vendors will tell you they do calculate this overhead and subtract it from the measured values to give you the most accurate values but in reality it is not entirely true. After falling into the trap to trust the profiler timings several times I have got into the habit to Measure with a profiler to get an idea where potential bottlenecks are. Measure again with tracing only the specific methods to check if this method is really worth optimizing. Optimize it Measure again. Be surprised that your optimization has made things worse. Think harder Implement something that really works. Measure again Finished! - Or look for the next bottleneck. Recently I have looked into issues with serialization performance. For serialization DataContractSerializer was used and I was not sure if XML is really the most optimal wire format. After looking around I have found protobuf-net which uses Googles Protocol Buffer format which is a compact binary serialization format. What is good for Google should be good for us. A small sample app to check out performance was a matter of minutes: using ProtoBuf; using System; using System.Diagnostics; using System.IO; using System.Reflection; using System.Runtime.Serialization; [DataContract, Serializable] class Data { [DataMember(Order=1)] public int IntValue { get; set; } [DataMember(Order = 2)] public string StringValue { get; set; } [DataMember(Order = 3)] public bool IsActivated { get; set; } [DataMember(Order = 4)] public BindingFlags Flags { get; set; } } class Program { static MemoryStream _Stream = new MemoryStream(); static MemoryStream Stream { get { _Stream.Position = 0; _Stream.SetLength(0); return _Stream; } } static void Main(string[] args) { DataContractSerializer ser = new DataContractSerializer(typeof(Data)); Data data = new Data { IntValue = 100, IsActivated = true, StringValue = "Hi this is a small string value to check if serialization does work as expected" }; var sw = Stopwatch.StartNew(); int Runs = 1000 * 1000; for (int i = 0; i < Runs; i++) { //ser.WriteObject(Stream, data); Serializer.Serialize<Data>(Stream, data); } sw.Stop(); Console.WriteLine("Did take {0:N0}ms for {1:N0} objects", sw.Elapsed.TotalMilliseconds, Runs); Console.ReadLine(); } } The results are indeed promising: Serializer Time in ms N objects protobuf-net   807 1000000 DataContract 4402 1000000 Nearly a factor 5 faster and a much more compact wire format. Lets use it! After switching over to protbuf-net the transfered wire data has dropped by a factor two (good) and the performance has worsened by nearly a factor two. How is that possible? We have measured it? Protobuf-net is much faster! As it turns out protobuf-net is faster but it has a cost: For the first time a type is de/serialized it does use some very smart code-gen which does not come for free. Lets try to measure this one by setting of our performance test app the Runs value not to one million but to 1. Serializer Time in ms N objects protobuf-net 85 1 DataContract 24 1 The code-gen overhead is significant and can take up to 200ms for more complex types. The break even point where the code-gen cost is amortized by its faster serialization performance is (assuming small objects) somewhere between 20.000-40.000 serialized objects. As it turned out my specific scenario involved about 100 types and 1000 serializations in total. That explains why the good old DataContractSerializer is not so easy to take out of business. The final approach I ended up was to reduce the number of types and to serialize primitive types via BinaryWriter directly which turned out to be a pretty good alternative. It sounded good until I measured again and found that my optimizations so far do not help much. After looking more deeper at the profiling data I did found that one of the 1000 calls did take 50% of the time. So how do I find out which call it was? Normal profilers do fail short at this discipline. A (totally undeserved) relatively unknown profiler is SpeedTrace which does unlike normal profilers create traces of your applications by instrumenting your IL code at runtime. This way you can look at the full call stack of the one slow serializer call to find out if this stack was something special. Unfortunately the call stack showed nothing special. But luckily I have my own tracing as well and I could see that the slow serializer call did happen during the serialization of a bool value. When you encounter after much analysis something unreasonable you cannot explain it then the chances are good that your thread was suspended by the garbage collector. If there is a problem with excessive GCs remains to be investigated but so far the serialization performance seems to be mostly ok.  When you do profile a complex system with many interconnected processes you can never be sure that the timings you just did measure are accurate at all. Some process might be hitting the disc slowing things down for all other processes for some seconds as well. There is a big difference between warm and cold startup. If you restart all processes you can basically forget the first run because of the OS disc cache, JIT and GCs make the measured timings very flexible. When you are in need of a random number generator you should measure cold startup times of a sufficiently complex system. After the first run you can try again getting different and much lower numbers. Now try again at least two times to get some feeling how stable the numbers are. Oh and try to do the same thing the next day. It might be that the bottleneck you found yesterday is gone today. Thanks to GC and other random stuff it can become pretty hard to find stuff worth optimizing if no big bottlenecks except bloatloads of code are left anymore. When I have found a spot worth optimizing I do make the code changes and do measure again to check if something has changed. If it has got slower and I am certain that my change should have made it faster I can blame the GC again. The thing is that if you optimize stuff and you allocate less objects the GC times will shift to some other location. If you are unlucky it will make your faster working code slower because you see now GCs at times where none were before. This is where the stuff does get really tricky. A safe escape hatch is to create a repro of the slow code in an isolated application so you can change things fast in a reliable manner. Then the normal profilers do also start working again. As Vance Morrison does point out it is much more complex to profile a system against the wall clock compared to optimize for CPU time. The reason is that for wall clock time analysis you need to understand how your system does work and which threads (if you have not one but perhaps 20) are causing a visible delay to the end user and which threads can wait a long time without affecting the user experience at all. Next time: Commercial profiler shootout.

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• CodePlex Daily Summary for Tuesday, May 11, 2010

  CodePlex Daily Summary for Tuesday, May 11, 2010New ProjectsASP.NET MVC Extensions: ASP.NET MVC Extensions is developed on top of ASP.NET MVC extensibility point, which allows your IoC Container to rule everywhere.Best practices in .NET: NMA is a collection of knowledges that I learned from my co-worker and Internet. It's built on Domain Driven Design theories. I used Struture Map,...BioRider: Project participant of the 1st National Award for InteroperabilityBSoft: that's the project for bsoftClosedXML - The easy way to OpenXML: ClosedXML makes it easier for developers to create OpenXML files for Excel 2007. It provides a nice object oriented way to manipulate the files (si...Dragon Master: A tool for all D&D masters that need to create Dragon NPCsFacturator - Create invoices easy and fast: Windows forms application for creating invoices based on a Word template. Including a simple workflow for send, payed and finished invoices and a q...FreeEPG: An Australian EPG using the Freeview online guide. All Freeview regions are supported and data can be exported in either XMLTV or Microsoft Media ...GreedyRSS: Convert everything to RSS FeedHByte: In honor of the heisenberg uncertainty principle. This is an implementation of a type who has byte semantics, but who's value and location can not...JSON RPC 2.0 - Javascript/.NET Implementation: JSON RPC 2.0 - Javascript/.NET Implementation - NOT READY YETMjollnir - Supplemental Library for BCL: Mjollnir is Supplements Library for BCL. Mjollnir is Compatible with .NET Framework 4 (or maybe later).Money Spinner: MoneySpinnerMSPY 2010 Open Extended Dictionary Building Tool: A tool to create Open Extend Dictionary for Microsoft Pinyin IME 2010, it is develped in C#Sharepoint Data Store: This is a small library that lets SharePoint developers store and manage custom application information in SharePoint.SharePointSlim: We are going to use it in conjunction with the PowerSlim projectSSTA: A Tool to Compare SQL Database Schema Versionstbeasy: tbeasyNew Releases8085 Microprocessor simulator: 8085 Instruction Set Simulator with source code: 8085 Instruction set simulator with windows installer plus complete source code and examplesAutoArchive: Site Template...: Slightly off topic, but take a looK!BioRider: Uptiva Dreams IT Entry: ==================================== National Interoperability Award ==================================== TEAM: Uptiva Dreams IT PROJECT: BioRide...C# Developer Utility Library: ScrimpNet.Core Library May 2010: Initial upload of project library. Contains only source files. Recommend adding extracted files to your project as a project reference.Coot: Beta 1: To install the screen saver: Extract the contents of the zip file (all three files) to C:\Windows\System32 Go to screen saver properties, select ...Deploy Workflow Manager: Deploy Workflow Manager v1: Recommend you test on your development environment first before implementing into production. Criteria to run the workflow is assumed to be inclu...Expression Encoder 3 Visual Basic Samples: Encoder 3 VB Samples: Zip file contains the Encoder 3 samples written in Visual Basic.FreeEPG: Debug Release: Initial Release. Run the application from the command line for options. If you choose to run the client as a Windows Service, then you will need t...FSharpChess: Alpha Release 0.197: This is just the latest version of the binaries. Note that there are two excecutables: FSharpChess includes a UI partially written in C# FSharpCh...GreedyRSS: GreedyRSS V2: V2与V1相比： 改进了插件架构 用数据库取代XML配置文件 用Web Services暴露了部分功能Headspring Labs: ASP.NET MVC 2 tips and tricks (code): Contains example app that demonstrates techniques in the Tips & Tricks powerpointHeadspring Labs: ASP.NET MVC tips and tricks PPT: Powerpoint file for the ASP.NET MVC tips and tricks talk.HouseFly controls: HouseFly controls beta 1.0.0.0: HouseFly controls release 1.0.0.0 betaiTuner - The iTunes Companion: iTuner 1.2.3782: This production release of iTuner 1.2 allows you to synchronize one or more iTunes playlists to a USB MP3 player. It also provides the ability to ...JSON RPC 2.0 - Javascript/.NET Implementation: v0.7: Protocol implemented. Most of the extra features implemented.MapWindow6: MapWindow 6.0 msi May 10, 2010: This version fixes a reproject bug where false_easting from .prj files was not being correctly converted into meters when the projection was in feet.Mouse Zoom - Visual Studio Extension: MouseZoom 1.7: Version 1.7 fixes a bug that can cause the keys to stick when leaving focus (e.g. opening a VS dialog box).Mouse Zoom - Visual Studio Extension: MouseZoom 1.8: Override mouse wheel scroll functionality to always scroll 25% no matter what zoom level you are on (by default, scrolling with the mouse wheel bec...MSPY 2010 Open Extended Dictionary Building Tool: 20100511build: First release. 1. Installation After you download it to your local disk, create a new folder and unzip it to the new folder, that's it. 2. run ...MSPY 2010 Open Extended Dictionary Building Tool: 20100511build2: First release. 1. Installation After you download it to your local disk, create a new folder and unzip it to the new folder, that's it. 2. run ...Multiwfn: multiwfn1.3.2: multiwfn1.3.2NASA Space Shuttle TV Schedule Transfer to Outlook Calendar: NASA Space Shuttle TV Schedule Release v1.4.132.1: Warning!There is a problem with the latest version of the program and rev 0 of STS-132 mission schedule. I am looking into the problem when the yea...NASA Space Shuttle TV Schedule Transfer to Outlook Calendar: NASA Space Shuttle TV Schedule Release v1.4.132.2: This release fixes a problem with rev 0 of the STS-132 mission schedule in recognizing the year of launch. NASA changed the year of launch to a fo...Object/Relational Mapper & Code Generator in Net 2.0 for Relational & XML Schema: 2.8: Switched compliation options to always run in 32-bit mode, to ensure it can connect to MSAccess & MSExcel on 64-bit machines. Updated parameterised...Open NFSe: OpenNFSe-Salvador v1.0.0: Atualização do OpenNFSe-Salvador para o novo schema utilizado pela prefeitura de Salvador.OpenSLIM: OpenSLIM-v373b0-20100509-0: Here is the list of new additions and improvements that this new major release incorporates: Systems Decommissioning Management. Improvements on...Pcap.Net: Pcap.Net 0.6.0 (44468): Pcap.Net - May 2010 Release Pcap.Net is a .NET wrapper for WinPcap written in C++/CLI and C#. It Features almost all WinPcap features and includes ...PowerShell Community Extensions: 2.0 Production: PowerShell Community Extensions 2.0 Release NotesMay 10, 2010 The primary purpose of the Pscx 2.0 release is to convert from the previous approach...Scrum Sprint Monitor: v1.0.0.47921 (.NET 4-TFS 2010): What is new in this release? Minor version over 1.0.0.47911 introducing CEIP (Customer Experience Improvement Program). This is taking advantage of...Sharepoint Data Store: 1.0: First ReleaseSPVisualDev - SharePoint Developer Tool: Version 2.2.0: Visual Studio 2010 is now supported. Note that this is only intended to be used for MOSS 2007 / WSS 3.0 development and not for SP 2010. Package SP...SQL Server PowerShell Extensions: 2.2.1 Production: Release 2.2 re-implements SQLPSX as PowersShell version 2.0 modules. SQLPSX consists of 9 modules with 133 advanced functions, 2 cmdlets and 7 scri...VCC: Latest build, v2.1.30510.0: Automatic drop of latest buildVCC: Latest build, v2.1.30510.1: Automatic drop of latest buildVCC: Latest build, v2.1.30510.2: Automatic drop of latest buildVolumeMaster: Volume Master 2.0 Beta: First release of VolumeMaster. So if you're running Windows Vista / 7 you can have a handy Volume OSD and control your volume with the following sh...WabbitStudio Z80 Software Tools: SPASM2 32-Bit: A test release for SPASM2.Web Camera Shooter: 1.0.0.1: Video capturing: Touchless SDK -> AForge.Video. Main window shown in taskbar and not top most. Native images generated for all assemblies. Sm...Most Popular ProjectsWBFS ManagerRawrAJAX Control ToolkitMicrosoft SQL Server Product Samples: DatabaseSilverlight ToolkitWindows Presentation Foundation (WPF)patterns & practices – Enterprise LibraryMicrosoft SQL Server Community & SamplesASP.NETPHPExcelMost Active Projectspatterns & practices – Enterprise LibraryMirror Testing SystemThe Information Literacy Education Learning Environment (ILE)RawrCaliburn: An Application Framework for WPF and SilverlightwhiteBlogEngine.NETTweetSharpjQuery Library for SharePoint Web ServicesIonics Isapi Rewrite Filter

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