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7.6.3.2 Thread Pool Installation

This section describes how to install MySQL Enterprise Thread Pool. For general information about installing plugins, see Section 7.6.1, “Installing and Uninstalling Plugins”.

To be usable by the server, the plugin library file must be located in the MySQL plugin directory (the directory named by the plugin_dir system variable). If necessary, configure the plugin directory location by setting the value of plugin_dir at server startup.

The plugin library file base name is thread_pool. The file name suffix differs per platform (for example, .so for Unix and Unix-like systems, .dll for Windows).

The thread pool monitoring tables are Performance Schema tables that are loaded and unloaded along with the thread pool plugin.

To enable thread pool capability, load the plugin by starting the server with the --plugin-load-add option. To do this, put these lines in the server my.cnf file, adjusting the .so suffix for your platform as necessary:

[mysqld]
plugin-load-add=thread_pool.so

To verify plugin installation, examine the Information Schema PLUGINS table or use the SHOW PLUGINS statement (see Section 7.6.2, “Obtaining Server Plugin Information”). For example:

mysql> SELECT PLUGIN_NAME, PLUGIN_STATUS
       FROM INFORMATION_SCHEMA.PLUGINS
       WHERE PLUGIN_NAME LIKE 'thread%';
+-----------------------+---------------+
| PLUGIN_NAME           | PLUGIN_STATUS |
+-----------------------+---------------+
| thread_pool           | ACTIVE        |
+-----------------------+---------------+

To verify that the Performance Schema monitoring tables are available, examine the Information Schema TABLES table or use the SHOW TABLES statement. For example:

mysql> SELECT TABLE_NAME
       FROM INFORMATION_SCHEMA.TABLES
       WHERE TABLE_SCHEMA = 'performance_schema'
       AND TABLE_NAME LIKE 'tp%';
+-----------------------+
| TABLE_NAME            |
+-----------------------+
| tp_thread_group_state |
| tp_thread_group_stats |
| tp_thread_state       |
+-----------------------+

If the server loads the thread pool plugin successfully, it sets the thread_handling system variable to loaded-dynamically.

If the plugin fails to initialize, check the server error log for diagnostic messages.