Another Look at MySQL 5.1’s SQL Diagnostic Tools


 
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Old 01-26-2009
Another Look at MySQL 5.1’s SQL Diagnostic Tools

Prior to MySQL 5.1, it wasn't all that easy to find the worst running SQL on a MySQL instance. And truth be told, MySQL still has a ways to go before it's an effortless process. But, the good news is there are some new aids in MySQL 5.1 and MySQL Enterprise that do make it more efficient to find and troubleshoot bad SQL code that's hiding inside a MySQL instance. Let's take a quick tour through these new features and see what help they provide.

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Apache::Session::Lock::MySQL(3pm)			User Contributed Perl Documentation			 Apache::Session::Lock::MySQL(3pm)

NAME
Apache::Session::Lock::MySQL - Provides mutual exclusion using MySQL SYNOPSIS
use Apache::Session::Lock::MySQL; my $locker = Apache::Session::Lock::MySQL->new(); $locker->acquire_read_lock($ref); $locker->acquire_write_lock($ref); $locker->release_read_lock($ref); $locker->release_write_lock($ref); $locker->release_all_locks($ref); DESCRIPTION
Apache::Session::Lock::MySQL fulfills the locking interface of Apache::Session. Mutual exclusion is achieved through the use of MySQL's GET_LOCK and RELEASE_LOCK functions. MySQL does not support the notion of read and write locks, so this module only supports exclusive locks. When you request a shared read lock, it is instead promoted to an exclusive write lock. CONFIGURATION
The module must know how to connect to your MySQL database to acquire locks. You must provide a datasource name, a user name, and a password. These options are passed in the usual Apache::Session style, and are very similar to the options for Apache::Session::Store::MySQL. Example: tie %hash, 'Apache::Session::MySQL', $id, { LockDataSource => 'dbi:mysql:database', LockUserName => 'database_user', LockPassword => 'K00l' }; Instead, you may pass in an already opened DBI handle to your database. tie %hash, 'Apache::Session::MySQL', $id, { LockHandle => $dbh }; AUTHOR
This module was written by Jeffrey William Baker <jwbaker@acm.org>. SEE ALSO
Apache::Session perl v5.10.1 2010-10-18 Apache::Session::Lock::MySQL(3pm)