Mysql Error - 32000 Cache Write Error In Cache Execute
so I thought I'd put this bread crumb out there for any others who might be experiencing the same problem. ADOdb is a database abstraction library for PHP and Python. I'm working in PHP in this case. The cache write error is being thrown when the project is under high load. After much investigation, it appears that this is a race condition within ADOdb when it is being used concurrently and the cache is enabled. Here's the scenario: The cache expires. Then two users attempt to access the service which makes a call to ADOdb to access the database. Both users make a request that executes the same SQL query with the same variables set. Two calls to the ADOdb cache execute function are made. Since the cache is expired, the cache execute function then calls the ADOdb cache write function. The cache write function uses the SQL query to generate a hash that determines the proper cache file to write to. Since both requests generated the same SQL query, each request attempts to write to the same file. The cache write function uses flock(), a PHP file locking function , to lock the cache file. One request will win the lock and successfully write the cache file. The other will fail to win the lock. This will cause the cache write function to return false. On seeing the return value of false, the cache execute function will then throw the cache write error for the user that made the request that failed to acquire the lock. This scenario can potentially play out every time the cache expires and two users make the same request concurrently. I have not been able to reproduce the error during testing, but I do believe this is what is happening in this instance. I recommend that if you want to examine this further and you're using ADOdb with PHP, that you read the php.net page on flock(), as there is a lot of information on how flock() works and what other users have experienced. I h
1Threaded Case StudyCisco 4Single Area OSPFPage 1Page 2Page 3Page 4Multi Area OSPFPage 1Page 2Page 3Routing RedundancyPage 1Page 2Page 3Page 4Cisco AVVIDPage 1Page 2Page 3Page 4Page 5Cisco CCSPProgrammingC#/MS-SQLInstalling a Dev EnvironmentPage 1Page 2Page 3A Simple Web AppPage 1Page 2Page 3Page 4Page 5Page 6Page 7Exploring LogicPage 1Page 2Page 3Page 4Page 5A Real Web AppPage 1Page 2Page 3Page 4Page 5Page 6Page 7Page 8Page 9Page 10Page 11Using Microsoft SQL ServerPage 1Page 2Page 3Page 4Page 5Page 6Page 7Page 8Mildly Advanced SQLPage 1Page 2Page 3Page 4Page 5A Blogging ApplicationPage 1Page 2Page 3Page 4Page 5Page 6Page 7Page 8Page 9Page 10Page 11Page 12Page 13Page 14Page 15Page http://www.programmersparadox.com/2008/10/23/adodb-cache-write-error/ 16Page 17PHP/MySQLInstalling PHPPage 1Page 2Page 3Page 4Page 5Page 6Page 7LinuxIP TablesFTPDOS FTPWS_FTPFrontpageGamesClankillerOblivionGuild WarsQuake IIIGTKRadiant TutorialInstallationYour First RoomPage 1Page 2ClippingPage 1Page 2Page 3The Flag RoomPage 1Page 2Three Point ClippingPage 1Page 2DetailsPage 1Page 2Main and BalconyPage 1Page 2MidfieldPage 1Page 2Page 3Page 4More DetailsPage 1Page 2Page 3Baldur's GateDual-Classing GuideFAQsGeneralShadows of AmnThrone of BhaalCleric/Druid SpellsCespenarGraphicsMayaArtBrycePrograms And ScriptsPHPPhpMySqlDumpJavascripttoolsBaldur's Gate FAQ : http://clankiller.com/games/bg/faq/index.php Overview3 Feb 2010 @ 11:38AM Updated: 5 Feb 2010 @ 08:44AMWelcome to the Baldur's Gate FAQ. This FAQ covers alot of the more common questions relating to Baldur's Gate, primarily Baldur's Gate 2: Shadows of Amn and the Throne of Bhaal expansion. The Baldur's Gate series is one of the most in-depth and involved games ever, including not dozens but literally hundreds of hours of potential game play. Due to the complex nature of the game, this FAQ has been compiled to help explain some of the less-understood aspects of the game, as well as to help overcome sometimes frustrating obstacles. For ease of use, the FAQ has been broken into three parts. Click on the folders for a list of questions, or on the FAQ name for the full FAQ.Comments (0)Part 1: General FAQThis covers general questions about the entire series of games, or questions that aren't applicable to a certain installmentWhat does THAC0 stand for?What are the lowest armor class and highest base sta
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