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  • Deleting huge chunks of data from mysql innodb

    - by ming yeow
    I need to delete a huge chunk of my data in my production database, which runs about 100GB in size. If possible, i would like to minimize my downtime. My selection criteria for deleting is likely to be DELETE * FROM POSTING WHERE USER.ID=5 AND UPDATED_AT<100 What is the best way to delete it? Build an index? Write a sequential script that deletes via paginating through the rows 1000 at a time?

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  • django: caching passwords for custom authentication

    - by gruszczy
    I am authenticating users in ldap, but this happens only once, when user is logging in. Afterwards I need to keep username and password, because before every ldap operation I need to make bind on ldap server before every operation. What is the safe way to cache this password (I can't store in the database or cookies) for as long as session persists.

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  • How to unit test django middleware?

    - by luc
    I've implemented a django middleware for getting pages from the database (something similar to the flatpage subframework) Unfortunately it seems that it is not possible to test it with the django testing framework. Any suggestion? Thanks in advance Update: maybe a mistake in my test but I can't get an object that should be returned by a middleware. I'll inverstigate more. Does anybody have unit-tested a middleware code?

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  • System architecture: simple approach for setting up background tasks behind a web application -- wil

    - by Tim Molendijk
    I have a Django web application and I have some tasks that should operate (or actually: be initiated) on the background. The application is deployed as follows: apache2-mpm-worker; mod_wsgi in daemon mode (1 process, 15 threads). The background tasks have the following characteristics: they need to operate in a regular interval (every 5 minutes or so); they require the application context (i.e. the application packages need to be available in memory); they do not need any input other than database access, in order to perform some not-so-heavy tasks such as sending out e-mail and updating the state of the database. Now I was thinking that the most simple approach to this problem would be simply to piggyback on the existing application process (as spawned by mod_wsgi). By implementing the task as part of the application and providing an HTTP interface for it, I would prevent the overhead of another process that is holding all of the application into memory. A simple cronjob can be setup that sends a request to this HTTP interface every 5 minutes and that would be it. Since the application process provides 15 threads and the tasks are quite lightweight and only running every 5 minutes, I figure they would not be hindering the performance of the web application's user-facing operations. Yet... I have done some online research and I have seen nobody advocating this approach. Many articles suggest a significantly more complex approach based on a full-blown messaging component (such as Celery, which uses RabbitMQ). Although that's sexy, it sounds like overkill to me. Some articles suggest setting up a cronjob that executes a script which performs the tasks. But that doesn't feel very attractive either, as it results in creating a new process that loads the entire application into memory, performs some tiny task, and destroys the process again. And this is repeated every 5 minutes. Does not sound like an elegant solution. So, I'm looking for some feedback on my suggested approach as described in the paragraph before the preceeding paragraph. Is my reasoning correct? Am I overlooking (potential) problems? What about my assumption that application's performance will not be impeded?

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  • Sugar SOAP set_entry

    - by Brian
    I am trying to add entries to a Sugar Contacts database with the following SOAP code in PHP. $set_entry_params = array( 'session' => $result_array->id, 'module_name' => 'Contacts', 'name_value_list'=>array( array('name'=>'Name','value'=>'Brian') ) ); $result = $soapClient->__soapCall('set_entry', $set_entry_params); An entry is made in the sugar db, but the name field is left blank and the Role field is labelled: Pre Sugar Roll Out does anyone know what is wrong here?

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  • best method to update the SQL table data from c# .NET 2005

    - by Jebli
    Hi , I have a dataset with some 30 records in it. I want to update it to the database tables. which is the best method to update the table. I am unable to use dataadapter.update() since i am using a procedure to populate the dataset. is there any efficient way to update other than iterating through EACH record and updating it Please help. Thanks.

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  • Ruby on Rails / PostgreSQL - Library not Loaded error when starting server- libq.5.dylib

    - by Mike McCoy
    I have app that is running Ruby 1.9.2, Rails 3, and postgreSQL 8.3. It was originally setup and working with postgreSQL 9.1, but I uninstalled 9.1 and installed and changed to 8.3 insure compatibility on a Heroku shared database setup. It was running ok, but it's not now Now, when working on this app, when I run a database upgrade I get this error: dlopen(/Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290/gems/pg-0.12.2/lib/pg_ext.bundle, 9): Library not loaded: libpq.5.dylib Referenced from: /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290/gems/pg-0.12.2/lib/pg_ext.bundle Reason: no suitable image found. Did find: /usr/lib/libpq.5.dylib: no matching architecture in universal wrapper - /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290/gems/pg-0.12.2/lib/pg_ext.bundle And when I try to run the server I get this error message: /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290/gems/pg-0.12.2/lib/pg.rb:4:in `require': dlopen(/Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290/gems/pg-0.12.2/lib/pg_ext.bundle, 9): Library not loaded: libpq.5.dylib (LoadError) Referenced from: /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290/gems/pg-0.12.2/lib/pg_ext.bundle Reason: no suitable image found. Did find: /usr/lib/libpq.5.dylib: no matching architecture in universal wrapper - /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290/gems/pg-0.12.2/lib/pg_ext.bundle from /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290/gems/pg-0.12.2/lib/pg.rb:4:in `<top (required)>' from /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:68:in `require' from /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:68:in `block (2 levels) in require' from /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:66:in `each' from /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:66:in `block in require' from /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:55:in `each' from /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290@global/gems/bundler-1.0.21/lib/bundler/runtime.rb:55:in `require' from /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290@global/gems/bundler-1.0.21/lib/bundler.rb:122:in `require' from /Users/michaeljmccoy/www/mikemccoy/config/application.rb:7:in `<top (required)>' from /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.0.rc2/lib/rails/commands.rb:53:in `require' from /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.0.rc2/lib/rails/commands.rb:53:in `block in <top (required)>' from /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.0.rc2/lib/rails/commands.rb:50:in `tap' from /Users/michaeljmccoy/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.0.rc2/lib/rails/commands.rb:50:in `<top (required)>' from script/rails:6:in `require' from script/rails:6:in `<main>' I know they are very similar errors and probably has to do with a missing path. However, when I add the path to my .profile file and restart the terminal window, I get the same errors.

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  • Retrieving Raw Data From RSS Feeds

    - by Rob
    I am trying to retrieve and use the raw data from RSS feeds. For example, trying to take a Yahoo Live Sports Scores RSS feed and taking the information and storing it in a database or displaying it on my web page for the games at interest. What is the best way to do this? I would prefer to use PHP to do this. Thank you in advance for your help!

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  • How do I extract data from a FoxPro memo field using .NET?

    - by Madhu kiran
    Hi, I'm writing a C# program to get FoxPro database into datatable everything works except the memo field is blank or some strange character. I'm using C# .Net 2.0. I tried the code posted by Jonathan Demarks dated Jan 12. I am able to get the index but i don't know how to use this index to fetch the data from memo file. Pleaese help me. Thanks Madhu

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  • MS SQL Index Scripting

    - by Fouad Masoud
    I'm using MS SQL 2008. Is it possible to create a script to loop over all tables in a database generating a set of index drop scripts and create scripts separately? What I have to do is drop all indexes on a set of databases to run a heavy data load process but then I want to re-enable all the indexes. I don't want to have to go through each table and script an index drop and then index create. Thanks!

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  • GQL how to select by UserProperty

    - by fmsf
    Hey I have this code but it doesn't work because it is expecting a string. How can I make it work? class Atable(BaseModel): owner = db.UserProperty() (...) --------- // -------------- query = "SELECT * FROM Atable WHERE owner=", users.get_current_user() results = db.GqlQuery(query) How can I fix that search? Thanks :) I've started with the appengine database yesterday so be gentle :)

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  • PostgreSQL custom exceptions?

    - by Steve F
    In Firebird we can declare custom exceptions like so: CREATE EXCEPTION EXP_CUSTOM_0 'Exception: Custom exception'; these are stored at the database level. In stored procedures, we can raise the exception like so: EXCEPTION EXP_CUSTOM_0 ; Is there an equivalent in PostgreSQL ?

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  • iGoogle Stack Overflow Gadget [closed]

    - by Charango
    Since SO's question database is becoming an excellent first point of call for finding answers to coding problems, some people (like me) might like to be able to fire up searches from their iGoogle home page, among the other searches you might launch from there. I've created a very simple gadget to do this, and put the source below. My hope is that this might provide a foundation on which community members with better ideas for performing this function, or ideas for enhancing it, can update it. Perhaps we could make it configurable to search via a site scope search from Google and / or a question search, for instance. I've hosted and registered this first version but if anyone makes changes and can host a new version / new pics elsewhere, please feel free. <?xml version="1.0" encoding="UTF-8"?> <Module> <ModulePrefs title="Stack Overflow Search" author="Community Wiki" author_email="[email protected]" author_affiliation="Stack Overflow" author_location="The Internet" author_aboutme="All sorts" author_link="http://stackoverflow.com" author_quote="Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's Law." description="Stack Overflow is rapidly becoming one of the best resources for finding answers to your programming questions. This gadget adds a question search box to your iGoogle homepage" screenshot="http://arkios-solutions.com/misc/sogadget/SOGadget.png" thumbnail="http://arkios-solutions.com/misc/sogadget/SOGadget_Thumbnail.png" singleton="true" title_url="http://stackoverflow.com" /> <Content type="html"><![CDATA[ <img src="http://i.stackoverflow.com/Content/Img/stackoverflow-logo-250.png" alt="Stackoverflow Logo"/> <div style="font-family:arial;font-size:0.8em;"> This gadget allows you to search the Stack Overflow question database. </div> <form name='SOQueryForm' action="http://stackoverflow.com/search" method="get" target="new"> <p>Your question: <input type='text' size='34' name='q' /></p> <p><input type='submit' value='Go' /></p> </form> ]]> </Content> </Module> The source / installable gadget xml are also hosted here.

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  • Django: Password protect photo url's?

    - by MikeN
    From my Django application I want to serve up secure photos. The photos are not for public consumption, I only want logged in users to have the ability to view them. I don't want to rely on obfuscated file id's (giving a photo a UUID of a long number) and count on that being hidden in my media folder. How would I store a photo securely on disk in my database and only stream it out to an authenticated session?

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  • Exception in MSAccess when adding datas with ' character

    - by Suryakavitha
    i am using windows forms application with MSAccess.... i got data from database table successfully but when i am trying to add data with (') character i got the exception that "OLEDB Exception: Syntax error(Missing Operator)inquery expression" ... Now how can i solve this problem? Plz tell me the solution of this problem.... all characters are accepted but apostrophe character only got error... Thanks in Advance

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  • XVal validation framework

    - by csetzkorn
    Hi, I started using this validation framework: http://blog.stevensanderson.com/2009/01/10/xval-a-validation-framework-for-aspnet-mvc/ Steve mentions that the DataAnnotationsValidationRunner implementation is slightly naive. Why is this and are there better implementations? I am also looking for a good example that uses this framework to validate database dependent business rules. Any pointers would be very much appreciated. Thanks. Christian

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  • How to use ASP .NET dropdown with ajax

    - by Poomjai
    Greeting, I'm beginer of ajax technology and now i need to create two dropdown in MVC project for example: First dropdown has the list of classroom [601,602,603] when i choose one then next dropdown will has the list of student belong to each class room. Now, I already create the repository class that has method GetStudentByClassroomName() and already connect to the database. Can anyone give me a suggestion how to create it or any technology to create the dropdown like this? Thank you very much ^_^

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  • java : writing large files ?

    - by umanga
    Greetings , I get huge number of records from database and write into a file.I was wondering what the best way to write huge files. (1Gb - 10Gb). Currently I am using BufferedWriter BufferedWriter mbrWriter=new BufferedWriter(new FileWriter(memberCSV)); while(done){ //do writings } mbrWriter.close();

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  • debugging JBoss 100% CPU usage

    - by NateS
    Originally posted on Server Fault, where it was suggested this question might better asked here. We are using JBoss to run two of our WARs. One is our web app, the other is our web service. The web app accesses a database on another machine and makes requests to the web service. The web service makes JMS requests to other machines, aggregates the data, and returns it. At our biggest client, about once a month the JBoss Java process takes 100% of all CPUs. The machine running JBoss has 8 CPUs. Our web app is still accessible during this time, however pages take about 3 minutes to load. Restarting JBoss restores everything to normal. The database machine and all the other machines are fine, only the machine running JBoss is affected. Memory usage is normal. Network utilization is normal. There are no suspect error messages in the JBoss logs. I have set up a test environment as close as possible to the client's production environment and I've done load testing with as much as 2x the number of concurrent users. I have not gotten my test environment to replicate the problem. Where do we go from here? How can we narrow down the problem? Currently the only plan we have is to wait until the problem occurs in production on its own, then do some debugging to determine the cause. So far people have just restarted JBoss when the problem occurred to minimize down time. Next time it happens they will get a developer to take a look. The question is, next time it happens, what can be done to determine the cause? We could setup a separate JBoss instance on the same box and install the web app separately from the web service. This way when the problem next occurs we will know which WAR has the problem (assuming it is our code). This doesn't narrow it down much though. Should I enable JMX remote? This way the next time the problem occurs I can connect with VisualVM and see which threads are taking the CPU and what the hell they are doing. However, is there a significant down side to enabling JMX remote in a production environment? Is there another way to see what threads are eating the CPU and to get a stacktrace to see what they are doing? Any other ideas? Thanks!

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  • Getting Facebook email/email hash.

    - by Zenzen
    I'll make it short: is it possible to get the user's facebook email adress (or a hashed email adress), so I can let's say compare his facebook email with his email in my database? I'm trying to get a FacebookUser and then use facebookUser.email_hash but that returns nothing.

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  • Convert String to java.util.Date

    - by Vinayak.B
    Hi Folks, I storing the date to SQLite database in the format d-MMM-yyyy,HH:mm:ss aaa And again retrieving it with the same format, the problem now is, I am gettin every thing fine exepth the Hour. Hour I am geting 00 every time, Here the print statement String date--->29-Apr-2010,13:00:14 PM After convrting Date--->1272479414000--Thu Apr 29 00:00:14 GMT+05:30 2010 Please where I am doing wrong. Cheers, Vinayak

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