InnoDB Plugin
C.1.2. Changes in MySQL 5.1.38 (01 September 2009)
As of MySQL 5.1.38, the InnoDB Plugin is included in MySQL 5.1 releases, in addition to the built-in version of InnoDB that has been included in previous releases. This version of the InnoDB Plugin is 1.0.4 and is considered of Beta quality.
The InnoDB Plugin offers new features, improved performance and scalability, enhanced reliability and new capabilities for flexibility and ease of use. Among the features of the InnoDB Plugin are “Fast index creation,” table and index compression, file format management, new INFORMATION_SCHEMA tables, capacity tuning, multiple background I/O threads, and group commit.
For information about these features, see the InnoDB Plugin Manual at
http://www.innodb.com/products/innodb_plugin/plugin-documentation. For general information about using InnoDB in MySQL, see Section 13.6, “The InnoDB Storage Engine”.
The InnoDB Plugin is included in source and binary distributions, except RHEL3, RHEL4, SuSE 9 (x86, x86_64, ia64), and generic Linux RPM packages.
To use the InnoDB Plugin, you must disable the built-in version of InnoDB that is also included and instruct the server to use InnoDB Plugin instead. To accomplish this, use the following lines in your my.cnf file:
[mysqld]
ignore-builtin-innodb
plugin-load=innodb=ha_innodb_plugin.so
For the plugin-load option, innodb is the name to associate with the plugin and ha_innodb_plugin.so is the name of the shared object library that contains the plugin code. The extension of .so applies for Unix (and similar) systems. For HP-UX on HPPA (11.11) or Windows, the extension should be .sl or .dll, respectively, rather than .so.
If the server has problems finding the plugin when it starts up, specify the pathname to the plugin directory. For example, if plugins are located in the lib/mysql/plugin directory under the MySQL installation directory and you have installed MySQL at /usr/local/mysql, use these lines in your my.cnf file:
[mysqld]
ignore-builtin-innodb
plugin-load=innodb=ha_innodb_plugin.so
plugin_dir=/usr/local/mysql/lib/mysql/plugin
The previous examples show how to activate the storage engine part of InnoDB Plugin, but the plugin also implements several InnoDB-related INFORMATION_SCHEMA tables. (For information about these tables, see
http://www.innodb.com/doc/innodb_plugin-1.0/innodb-information-schema.html.) To enable these tables, include additional name=library pairs in the value of the plugin-load option:
[mysqld]
ignore-builtin-innodb
plugin-load=innodb=ha_innodb_plugin.so
;innodb_trx=ha_innodb_plugin.so
;innodb_locks=ha_innodb_plugin.so
;innodb_cmp=ha_innodb_plugin.so
;innodb_cmp_reset=ha_innodb_plugin.so
;innodb_cmpmem=ha_innodb_plugin.so
;innodb_cmpmem_reset=ha_innodb_plugin.so
The plugin-load option value as shown here is formatted on multiple lines for display purposes but should be written in my.cnf using a single line without spaces in the option value. On Windows, substitute .dll for each instance of the .so extension.
After the server starts up, verify that InnoDB Plugin has been loaded by using the SHOW PLUGINS statement. For example, if you have loaded the storage engine and the INFORMATION_SCHEMA tables, the output should include lines similar to these:
mysql> SHOW PLUGINS;
หัวข้อ: MySQL 5.1.38 >>>>>>>New (อ่าน 4043 ครั้ง)