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• What does xp_qv do in SQL Server?

  - by Chris

  Last night one of our SQL servers developed some major problems and after a colleague stopped, started, and all the usual things it started checking and rebuilding databases and is now running an extended stored procedure called "xp_qv". The internet seems to be very short of information on what this procedure does or anythign like that so I was hoping somebody here might be able to help. I should add that I assume it is meant to be running so the question isn't "Can I stop it" or anything like that, its just curiosity in what it is doing in the hope that it will help determine how long before things are usable again...

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• Load balancer - how to write one for a custom application?

  - by Poni

  Hi! I've written a simple server application which will run distributed on several machines. My question is how does a network load balancer works, in general? I've heard of round-robin and other algorithms, but what I haven't got answer to is how does the process really goes? In socket terms. The client connects to one of the load balancer machines, asks for a "free-to-connect-to" server and simply connects to it? That's the simpliest way I can think of. .. or, does it use the load balancer as a proxy (that implies that all the NBs must be always connected to the application servers, and data is transferred through them)? It's more of a general question. How would you do this? Thank you all!

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• UITableView becomes invisible after changing data in it

  - by Alexander Shemshurenko

  Hi I have application with TabBar that control several views. In one view i control connection to different servers.Each server provides different set of items. I display these items in UITableView on other view. I create table view like this UITableView * aTableView = [[UITableView alloc] initWithFrame:CGRectMake(X,Y,Width,Height) style:UITableViewStyleGrouped]; [[self view] addSubview:aTableView]; aTableView.da taSource = self; The problem is that Table view displayed ok first time , but if i go back to view number one and change server(changing list of items that should be displayed in table view), table view becomes invisible for some reason. If i tap on the screen in place where it should be, its becomes visible again. Ive tried to call to reloadData and setNeedDisplay in viewWillAppear of the UIViewController that hosts this table view, but without success. Any advice? Thanks

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• Setting up phpstorm 4 with XAMPP on Windows 7

  - by stirredo

  I need help setting up phpstorm (4.0) with XAMPP which is at the default location c:\htdocs. I create all my projects at c:\htdocs\projectname. Here are the things I have already done: Setup the PHP interpretator by going to settings and then PHP (main menu) Go to PHP Servers and then To setup run configuration I have the done the following: Now when I run using the above configuration it just takes me to localhost in my browser, instead of the file I am editing (http://localhost instead of localhost/myproject/myfile.php). What am I missing? I read the help topics of phpstorm and googled a lot but still couldn't figure it out.

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• IIS 7 - floats returning with commas instead of periods

  - by cc0

  I'm having trouble reading rows with float values, because these rows return for example 12,34 instead of 12.34 as it should. I suspect this is because both my IIS and SQL server is on a Norwegian Windows Server 2008. So I went to the regional settings and customized the default decimal symbol, then restarted my servers. The output in the database now shows the period decimal symbol, but when I request it through the IIS server it comes comma separated (the IIS server is on another computer, but that also has the default decimal symbol set to period). The IIS server is IIS7 and the SQL Server is 2008 Does anyone have any idea how to fix this? Any help would be greatly appreciated.

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• Segmentation fault when accessing a PHP page

  - by Justin Ethier

  Sometimes when one of our Apache web servers is restarted, we experience segmentation faults when any PHP page is subsequently accessed. The following line is printed in the httpd error_log: [Wed Jun 16 10:59:33 2010] [notice] child pid 31513 exit signal Segmentation fault (11) There will be one of these lines for each PHP page that is accessed. This appears to happen randomly - the "workaround" to-date is to restart httpd, which eventually fixes the problem (almost always after a single restart). Although we only see this happen rarely, it still happens frequently enough to be of concern. So my question is, why is this happening in the first place? Is this a known bug with the version of Apache / PHP / Linux / etc that we are using? Any ideas? The environment is: Fedora 11 Apache 2.2.15 (Default settings) PHP 5.2.13 I can provide more information if that would help narrow things down, since this error message is rather generic... Any help is appreciated.

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• How to transfer binary data through multiple http server?

  - by solotim

  Well, the question is not intended to be that big. Let me explain the scenario: I have two http servers. server A is accessible to end user by web browser, while server B is internal server which can only be accessed by server A. If server B generate some big jpeg image in local disk, obviously we can't just delivery those path to image to server A and eventually to end user. Then, how to let end user see those image without firstly storing those image data in server A temporarily? I run PHP on server A and perl on server B, but this should not matter. I need a general pattern for implementing this.

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• How to configure AutoMapper if not ASP.net Application?

  - by alex

  I'm using AutoMapper in a number of projects within my solution. These projects may be deployed independantly, across multiple servers. In the documentation for AutoMapper it says: If you're using the static Mapper method, configuration only needs to happen once per AppDomain. That means the best place to put the configuration code is in application startup, such as the Global.asax file for ASP.NET applications. Whilst some of the projects will be ASP.net - most of these are class libraries / windows services. Where should I be configuring my mappings in this case?

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• How to make software which will work like torrent?

  - by Nitz

  Hey guys How to make software work like torrent work? Bcz always when i see that torrent software then i am really amazed by their sizes and what they do in that sizes? How they managed the download by parts and then all together as soon as u downloaded full part? and as soon as you had great speed then your download speed automatically goes up? How to make software which will work like torrent means peer-to-peer? how to make this kind of software which can download from different servers and managed to know each users download and upload? and how they have pretty small size? which tech. they have used in that kind of software? Sorry i had asked many question. I know how downloading is happening means peer-to-peer all that.. but i don't know how they have built that kind of thing?

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• how do I detect OS X in my .vimrc file, so certain configurations will only apply to OS X?

  - by Brandon

  I use my .vimrc file on my laptop (OS X) and several servers (Solaris & Linux), and could hypothetically someday use it on a Windows box. I know how to detect unix generally, and windows, but how do I detect OS X? (And for that matter, is there a way to distinguish between Linux and Solaris, etc. And is there a list somewhere of all the strings that 'has' can take? My Google-fu turned up nothing.) For instance, I'd use something like this: if has("mac") " open a file in TextMate from vi: " nmap mate :w<CR>:!mate %<CR> elseif has("unix") " do stuff under linux and " elseif has("win32") " do stuff under windows " endif But clearly "mac" is not the right string, nor are any of the others I tried.

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• OptionParser python module - multiple entries of same variable?

  - by jduncan

  I'm writing a little python script to get stats from several servers or a single server, and I'm using OptionParser to parse the command line input. #!/usr/bin/python import sys from optparse import OptionParser ... parser.add_option("-s", "--server", dest="server", metavar="SERVER", type="string", help="server(s) to gather stats [default: localhost]") ... my GOAL is to be able to do something like #test.py -s server1 -s server2 and it would append both of those values within the options.server object in some way so that I could iterate through them, whether they have 1 value or 10. Any thoughts / help is appreciated. Thanks.

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• ObjectDataSource cannot find type when deployed to SharePoint

  - by Sean

  I'm receiving the following error when deploying a feature containing ASP.NET pages to our development SharePoint servers: System.InvalidOperationException: The type specified in the TypeName property of ObjectDataSource 'odsYears' could not be found. Our .dll is being deployed to the GAC and our pages are being deployed to the the respective Features directory in the 12 hive. We are not receiving this error on our Sandbox SharePoint server. I disassembled the .dll to be sure the class was being deployed and everything looked ok. Does anyone have any ideas on why this would not work on one of our SharePoint environments? Thanks.

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• Retreiving data from MySQL with html/javaScript on one domain and the PHP file on the other

  - by Mike

  I need to retrieve data from a MySQL database, and have it work one way for all types of servers. For example it should work on a server that runs no server side language, it should also work on LAMP, and IIS. I was thinking about using ajax and xmlhttprequest, but learned of the cross domain limitation. I also tried to just include the PHP in a tag, but it comes back with a syntax error in the HTML code created by the PHP file, even though it looks correct. Does anyone know how to fix either of these issues, or have a different way to go about it?

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• Create view or SP, only if the DB contains a pattern

  - by Randall Salas

  Hi all: I am working on a script, that needs to be run in many different SQL servers. Some of them, shared the same structure, in other words, they are identical, but the filegroups and the DB names are different. This is because is one per client. Anyway, I would like when running a script, If I chose the wrong DB, it should not be executed. I am trying to mantain a clean DB. here is my example, which only works for dropping a view if exists, but does not work for creating a new one. I also wonder how it would be for creating a stored procedure. Thx a lot. if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[ContentModDate]') and OBJECTPROPERTY(id, N'IsView') = 1) AND CHARINDEX('Content', DB_NAME()) 0 drop view [dbo].[ContentModDate] GO IF (CHARINDEX('Content', DB_NAME()) 0)BEGIN CREATE VIEW [dbo].[Rx_ContentModDate] AS SELECT 'Table1' AS TableName, MAX(ModDate) AS ModDate FROM Tabl1 WHERE ModDate IS NOT NULL UNION SELECT 'Table2', MAX(ModDate) AS ModDate FROM Table2 WHERE ModDate IS NOT NULL END END GO

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• Visual Studio Symbols stored/loaded from wrong place

  - by werty0u

  Hello, I'm rather new to symbol servers and I've been experimenting with them and Visual Studio 2008 running Windows XP(SP3). I've encountered a wierd problem as my symbols are not being cached locally in the directory I've specified all the time. The possible reasons I have found for this si that the symbols(.pdb's) are being written to VS's IDE directory and/or the symbols are somehow being written in with the .exe, which I find odd since it should be read only. The symbols are being sent to the "server" I've specified so that part of the system shouldn't be the problem. Has anyone else had this type of issue before and/or maybe a solution to this problem? Thanks :)

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• Load Balancing and Failover for Read-Only PostgreSQL Database

  - by Eric J.

  Scenario Multiple application servers host web services written in Java, running in SpringSource dm Server. To implement a new requirement, they will need to query a read-only PostgreSQL database. Issue To support redundancy, at least two PostgreSQL instances will be running. Access to PostgreSQL must be load balanced and must auto-fail over to currently running instances if an instance should go down. Auto-discovery of newly running instances is desirable but not required. Research I have reviewed the official PostgreSQL documentation on this issue. However, that focuses on the more general case of read/write access to the database. Top google results tend to lead to older newsgroup messages or dead projects such as Sequoia or DB Balancer, as well as one active project PG Pool II Question What are your real-world experiences with PG Pool II? What other simple and reliable alternatives are available?

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• Why does Silverlight provides webcam and microphone support without any encoding API?

  - by Shurup

  In the list of new features in Silverlight 4 you will find following: Webcam and microphone to allow sharing of video and audio for instance for chat or customer service applications. Silverlight captures an audio stream as raw pcm. So how would you realize for example audio/video chat or client/server audio recording application without any encoding on the client side, where there is no APIs in Silverlight available? Much less in a Silverlight you cannot use an unmanaged dll. You can use a com automation (a new feature of the Silverlight 4, I think only for Windows) but only if it was already installed on the client side (do you know any encoding COM servers that are installed with the windows). Otherwise, how would you deploy a custom COM server within you Silverlight application? The only way I found is either to deploy a command-line encoding and use it with COM AutomationFactory.CreateObject("WScript.Shell") or to implement an encoding to use it in your own AudioSink.

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• Can a war file be deployed on any server?

  - by Roshan

  Please pardon me if this question is silly. Suppose I develop a j2ee web application using srping framework and a MS SQL Server database, using a Webspphere application server. I later create a war file for this application. Can I deploy this war file on a tomcat server without any change in code? Or my question is can this be hosted by web hosting which provides only Tomcat servers? If yes, is there any change in code required? If it cannot be deployed, can you please suggest me what to do, because I havent developed any application on a tomcat server. All the applications that I have developed have been on Websphere App Server using RAD.

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• amazon design doubt

  - by praveen

  I was looking at the amazon website and was wondering how one of the feature would have been implemented. The feature : what customers buy after viewing a particular item. If i were to develop such a feature i would probably generate a session id for each user session and store the session id-page id combination in a log file. and if a book is bought set a separate flag for the session id-page id. A separate program can then be run on the log file periodically, to identify the groups that were bought together/viewed together and that information can be stored in a persistent file. This is ofcourse a simple solution without taking into consideration the distributed nature of the servers - but would this suffice or can you help me identify a better design.

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• Git branch strategy for small dev team

  - by Bilal Aslam

  We have a web app that we update and release almost daily. We use git as our VCS, and our current branching strategy is very simple and broken: we have a master branch and we check changes that we 'feel good about' into it. This works, but only until we check in a breaking change. Does anyone have a favorite git branch strategy for small teams which meets the following requirements: Works well for teams of 2 to 3 developers Lightweight, and not too much process Allows devs to isolate work on bug fixes and larger features with ease Allows us to keep a stable branch (for those 'oh crap' moments when we have to get our production servers working) Ideally, I'd love to see your step-by-step process for a dev working on a new bug

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• Copying Some from a PostgreSQL Server to Another

  - by whollychao

  I am in need of an application that can periodically transmit select rows from a PostgreSQL database across a network to a second PostgreSQL server. Typically these will be the most recent row added, pulled and transmitted every 10-30 seconds. The primary servers run in a MS Windows environment with a high-latency, and occasionally intermittent, network connection. Therefore, any application would have to be tolerant of this and ideally automatically reconnect / resend data that could not be transmitted. Due to the environment and the requirements, a full-blown replication package would be unnecessary. I appreciate any help anyone has with this problem.

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• Using protocol buffers for a comprehensive data strategy for Windows Mobile devices

  - by Steve

  I have started reading some of the posts related to protocol buffers. The serialization method seems very appropriate for the transfer of data to and from web servers. Has anyone considered using a method like this to save and retrieve data on the mobile device itself? (i.e. a replacement for a traditional database / orm layer) Where would the data be persisted? How would the data be queried? Would it make sense to store the data in a traditional database (SqlCE or SqlLite) with a few "searchable" columns and then one column for the serialized data? Thoughts? Am I out on a limb here? Thank you!

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• How to add SSL to subdomain that points to a different server?

  - by Travis

  I don't know much about secure certificates, so please bear with me... I've got a webserver that has a single domain SSL certificate https://secure.mysite.com I also have a couple of subdomains that point to different servers. http://www.mysite.com ( main server) http://subdomain.mysite.com (completely different server) I am wondering: What is the best way to add SSL to the subdomain: https://subdomain.mysite.com Is it possible to configure something like this with a wildcard certificate? Or is it better to purchase another single-domain certificate and install it on the seperate server? Are there any special considerations / pitfalls in doing something like this? Thanks, in advance, for your help.

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• How to bind a control to a singleton in Cocoa?

  - by SphereCat1

  I have a singleton in my FTP app designed to store all of the types of servers that the app can handle, such as FTP or Amazon S3. These types are plugins which are located in the app bundle. Their path is located by applicationWillFinishLoading: and sent to the addServerType: method inside the singleton to be loaded and stored in an NSMutableDictionary. My question is this: How do I bind an NSDictionaryController to the dictionary inside the singleton instance? Can it be done in IB, or do I have to do it in code? I need to be able to display the dictionary's keys in an NSPopupButton so the user can select a server type. Thanks in advance! SphereCat1

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• EJB3.1 Remote invocation - is it distributed automatically? is it expensive?

  - by Hank

  I'm building a JEE6 application with performance and scalability in the forefront of my mind. Business logic and JPA2-facade is held in stateless session beans (EJB3.1). As of right now, the SLSBs implement only @Remote-interfaces. When a bean needs to access another bean, it does so via RMI. My reasoning behind this is the assumption that, once the application runs on a bunch of clustered application servers, the RMI-part allows the execution to be distributed across the whole cluster automagically. Is that a correct assumption? I'm fine with dealing with the downsides of that (objects lose entityManager session, pass-by-value), at least I think so. But I am wondering if constant remote invocation isn't adding more load then necessary.

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