A deep look at MySQL 5.5 partitioning enhancements

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12-24-2009

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A deep look at MySQL 5.5 partitioning enhancements

The release of MySQL 5.5 has brought several enhancements. While most of the coverage went, understandably, to the semi-synchronous replication, the enhancements of partitioning were neglected, and sometimes there was some degree of misunderstanding on their true meaning. With this article, we want to explain these cool enhancements, especially the parts that were not fully understood.

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apache::session::lock::mysql

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)

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