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5.6.3.2 Thread Pool Installation
This section describes how to install MySQL Enterprise Thread Pool. For general information about installing plugins, see Section 5.6.1, “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).
Thread Pool Installation as of MySQL 8.0.14
In MySQL 8.0.14 and higher, the thread pool monitoring tables
are Performance Schema tables that are loaded and unloaded
along with the thread pool plugin. The
INFORMATION_SCHEMA
versions of the tables
are deprecated but still available; they are installed per the
instructions in
Thread Pool Installation Prior to MySQL 8.0.14.
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 (adjust 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 5.6.2, “Obtaining Server Plugin Information”). For example:
- FROM INFORMATION_SCHEMA.PLUGINS
- +-----------------------+---------------+
- | 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
- +-----------------------+
- | 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.
Prior to MySQL 8.0.14, the thread pool monitoring tables are plugins separate from the thread pool plugin and can be installed separately.
To enable thread pool capability, load the plugins to be used
by starting the server with the
--plugin-load-add
option. For
example, if you name only the plugin library file, the server
loads all plugins that it contains (that is, the thread pool
plugin and all the INFORMATION_SCHEMA
tables). To do this, put these lines in the server
my.cnf
file (adjust the
.so
suffix for your platform as
necessary):
[mysqld]
plugin-load-add=thread_pool.so
That is equivalent to loading all thread pool plugins by naming them individually:
[mysqld]
plugin-load-add=thread_pool=thread_pool.so
plugin-load-add=tp_thread_state=thread_pool.so
plugin-load-add=tp_thread_group_state=thread_pool.so
plugin-load-add=tp_thread_group_stats=thread_pool.so
If desired, you can load individual plugins from the library
file. To load the thread pool plugin but not the
INFORMATION_SCHEMA
tables, use an option
like this:
[mysqld]
plugin-load-add=thread_pool=thread_pool.so
To load the thread pool plugin and only the
TP_THREAD_STATE
INFORMATION_SCHEMA
table, use options like
this:
[mysqld]
plugin-load-add=thread_pool=thread_pool.so
plugin-load-add=tp_thread_state=thread_pool.so
To verify plugin installation, examine the
INFORMATION_SCHEMA.PLUGINS
table
or use the SHOW PLUGINS
statement (see
Section 5.6.2, “Obtaining Server Plugin Information”). For example:
- FROM INFORMATION_SCHEMA.PLUGINS
- +-----------------------+---------------+
- | PLUGIN_NAME | PLUGIN_STATUS |
- +-----------------------+---------------+
- | thread_pool | ACTIVE |
- | TP_THREAD_STATE | ACTIVE |
- | TP_THREAD_GROUP_STATE | ACTIVE |
- | TP_THREAD_GROUP_STATS | ACTIVE |
- +-----------------------+---------------+
If the server loads the thread pool plugin successfully, it
sets the thread_handling
system variable to
loaded-dynamically
.
If a plugin fails to initialize, check the server error log for diagnostic messages.
Document created the 26/06/2006, last modified the 26/10/2018
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