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• clamAV is slowing down my site, is there a solution or substitute?

  - by Scarface

  Hey guys quick question, I just installed clamAV (antivirus) on my apache server (running php and linux) and it is reducing the entire performance of my site drastically for some reason. Does anyone know why this may be or know of a better solution for scanning file uploads?

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• Is there a downside to adding an anonymous empty delegate on event declaration?

  - by serg10

  I have seen a few mentions of this idiom (including on SO): // Deliberately empty subscriber public event EventHandler AskQuestion = delegate {}; The upside is clear - it avoids the need to check for null before raising the event. However, I am keen to understand if there are any downsides. For example, is it something that is in widespread use and is transparent enough that it won't cause a maintenance headache? Is there any appreciable performance hit of the empty event subscriber call?

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• VB.Net Linq Datatable Exists

  - by LarsH

  I would like to use Linq instead of below function : Friend Function IsCollectionInTable2(ByVal apps As DataTable, ByVal collectionId As String) As Boolean For Each row As DataRow In apps.Rows If row("CollectionId").ToString = collectionId Then Return True Next Return False End Function The best I can do is below: Friend Function IsCollectionInTable(ByVal apps As DataTable, ByVal collectionId As String) As Boolean Return (From row In apps.AsEnumerable() Where (row.Field(Of String)("CollectionId") = collectionId) Select row.Field(Of String)("CollectionId")).Count > 0 End Function I would like to use Exists or Any in above function. Performance could be an issue,

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• Updating an atom with a single value

  - by mikera

  I have a number of atoms in my code where a common requirement is to update them to a new value, regardless of the current value. I therefore find myself writing something like this: (swap! atom-name (fn [_] (identity new-value))) This works but seems pretty ugly and presumably incurs a performance penalty for constructing the anonymous closure. Is there a better way?

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• Application Engineering and Number of Users

  - by Kramii

  Apart from performance concerns, should web-based applications be built differently according to the number of (concurrent) users? If so, what are the main differences for (say) 4, 40, 400 and 4000 users? I'm particularly interested in how logging, error handling, design patterns etc. would be be used according to the number of concurrent users.

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• Is there something faster than -drawInRect:withFont:lineBreakMode:alignment: ?

  - by mystify

  Shark shows me that this method takes a HUGE performance hit. Like 80% in my table view. All I do is draw two labels per cell (about 8 in total per page). During scrolling. I drawInRect: with that. Are there some better methods? Like drawing directly to some layer?

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• How to optimize an update SQL that runs on a Oracle table with 700M rows

  - by Bruno Rothgiesser

  UPDATE [TABLE] SET [FIELD]=0 WHERE [FIELD] IS NULL [TABLE] is an Oracle database table with more than 700 million rows. I cancelled the SQL execution after it had been running for 6 hours. Is there any SQL hint that could improve performance? Or any other solution to speed that up?

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• SQL Server 2008 - Query takes forever to finish even though work is actually done

  - by Brian

  Running the following simple query in SSMS: UPDATE tblEntityAddress SET strPostCode= REPLACE(strPostCode,' ','') The update to the data (at least in memory) is complete in under a minute. I verified this by performing another query with transaction isolation level read uncommitted. The update query, however, continues to run for another 30 minutes. What is the issue here? Is this caused by a delay to write to disk? TIA

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• How to log sql statements in grails

  - by damian

  Hi I want to log in the console or in a file, all the queries that Grails do, to check performance. I had configured [this][1] without success. Any idea would help. [1]: http://www.grails.org/FAQ#Q: How can I turn on logging for hibernate in order to see SQL statements, input parameters and output results?

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• Download pdf programatically...

  - by Perplexed

  Hi, How can I download a pdf and store to disk using vb.net or c#? The url (of the pdf) has some rediection going on before the final pdf is reached. I tried the below but the pdf seems corrupted when I attempt to open locally, Dim PdfFile As FileStream = File.OpenWrite(saveTo) Dim PdfStream As MemoryStream = GetFileStream(pdfURL) PdfStream.WriteTo(PdfFile) PdfStream.Flush() PdfStream.Close() PdfFile.Flush() PdfFile.Close() many thanks, KS

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• What's the best practice for single sign on at one web server?

  - by Jade.Wang

  We have some apps written in classic ASP, ASP.NET and PHP. They are all in one same web server. We want to transfer between the apps who is currently log in or none, we do not need to transfer everything in the session object. What is the best way? We need secure and high performance. Thanks.

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• Hadoop write directory

  - by FaultyJuggler

  Simple question but reading through documentation and configuration I can't quite seem to figure it out. How do I A) know where hadoop is writing to on the local disk and B) change that For initial testing I setup HDFS on a 20gb linux VM - to it we've added a 500gb networked drive for moving towards prototyping the full system. So now how do I point HDFS at that drive, or do I simply move the home directory/install with some slight change in setup and restart the process?

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• How important is it to unset variables in PHP?

  - by dd0x

  I am somewhat new to PHP and I am wondering: How important is it to unset variables in PHP? I know in languages like C we free the allocated memory to prevent leaks, etc. By using unset on variables when I am done with them, will this significantly increase performance of my applications? Also is there a benchmark anywhere that compares difference between using unset and not using unset?

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• Which library should I use for server-side image manipulation on Node.JS?

  - by Andrew

  I found a quite large list of available libraries on Node.JS wiki but I'm not sure which of those are more mature and provide better performance. Basically I want to do the following: load some images to a server from external sources put them onto one big canvas crop and mask them a bit apply a filter or two Resize the final image and give a link to it Big plus if the node package works on both Linux and Windows.

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• JavaScript Output to a File

  - by clops

  I am creating quite a bit of XML with JavaScript which is then processed by variuos components. I would like to send this XML to some file and prompt the user to save it on their disk (all this happens in the browser at the client, no server interaction whatsoever). Is this at all possible? Google is not a lot of help here :(

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• What does this random number do: /javascripts/rails.js?1271798101

  - by viatropos

  I think I remember reading that that has to do with telling the browser not to cache it or something. How does this impact browser caching and application performance in production? When does that number change? <script src="/javascripts/rails.js?1271798101" type="text/javascript"></script>

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• Does an XML schema or DTD exist for PerformancePoint's Xml Metadata?

  - by Athens

  I wrote several XQuery statements to shred existing KPI and Dashboard metadata but I would like to validate my queries by reviewing the corresponding Xml Schema or DTD if it exists. I searched online but could not find what i was looking for. The metadata is stored in Performance Point's back end Sql Server database in the dbo.FCObjects table's SerializedXml column.

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• Separate tables for just one field can be logical ?

  - by Freshblood

  If I have one table which has a City field and as expected this field will repeat itself so only separate it to another table can be ok for normalizing concepts? I mean separated table who has only one field can be meaningful and can help performance gaining?

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• Manipulate data in the DB query or in the code

  - by DrDro

  How do you decide on which side you perform your data manipulation when you can either do it in the code or in the query ? When you need to display a date in a specific format for example. Do you retrieve the desired format directly in the sql query or you retrieve the date then format it through the code ? What helps you to decide : performance, best practice, preference in SQL vs the code language, complexity of the task... ?

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• How to install Visual C++ 2008 Express' sdk manually for eclipse cdt ?

  - by Mask

  I run into a problem when trying to debug an opensource project, it requires Visual C++ 2008 Express' sdk to compile successfully,but I'm using cdt. Is there a way to manually install the sdk for cdt manually?(My disk space and memory are very limited...)

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• Python Logging across multiple classes and files; how to configure so as to be easily disabled?

  - by mellort

  Currently, I have osmething like this in all of my classes: # Import logging to log information import logging # Set up the logger LOG_FILENAME = 'log.txt' logging.basicConfig(filename=LOG_FILENAME,level=logging.DEBUG) This works well, and I get the output I want, but I would really like to have all this sort of information in one place, and be able to just do something like import myLogger and then start logging, and then hopefully be able to just go into that file and turn off logging when I need an extra performance boost. Thanks in advance

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• MvvmCross experiences, hindsight, limitations?

  - by Jason Steele

  I am considering using the MvvmCross framework for a cross platform mobile application that will target Android, iPhone and WP7. Does anyone have any experience with this framework they would like to share, and are they aware of any constraints or limitations that it would be useful to be aware of? For example, am I still able to use native page transitions of my choosing? Are there any performance or storage (app size) implications?

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• Visual C++ 9 compiler options to make the program run faster

  - by John Williams

  I have built an open-source application from the source code. Unfortunately, the original executable runs significantly faster. I tried to enable few compiler optimizations, but the result wasn't satisfactory enough. What else do I need to make in Visual Studio 2008 to increase the executable performance? Thanks!

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• What is the best way to copy a folder and all subfolders and files using c#

  - by karthik

  I need to copy a Folder from one drive to a removable Hard disk. The Folder which needs to be copied will have many sub folders and files in it. The input will be Source Path and Target Path. Like.. Source Path : "C:\SourceFolder" Target Path : "E:\" After copying is done, i shud be able to see the folder "SourceFolder" in my E: drive. Thanks.

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• INNER JOIN keywords | with and without using them

  - by cedar715

  SELECT * FROM TableA INNER JOIN TableB ON TableA.name = TableB.name SELECT * FROM TableA, TableB where TableA.name = TableB.name Which is the preferred way and why? Will there be any performance difference when keywords like JOIN is used? Thanks

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