A Quick Look at MySQL 5.4

 
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Old 04-21-2009
A Quick Look at MySQL 5.4

Although MySQL 5.1 was released in December of 2008, Sun Microsystems isn't wasting any time moving forward with a number of new and exciting enhancements for its next release, MySQL 5.4. The first item of note is that the MySQL Server will be returning to a release early/often paradigm. So, instead of waiting on a full set of previously agreed upon features to be ready, the goal will now be to adhere to time-controlled releases that include all features that are ready by an agreed-upon beta date, with any features not fully 'baked' simply rolling to the next release. This being the case, MySQL 5.4 won't include some large new features like the Falcon transactional storage engine and the new backup utility, but it will include a number of very desirable enhancements that help your database-driven systems scale better and run faster in many cases. Let's take a look at what's included...

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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)