21.2.1. Performance Schema Build Configuration

For the Performance Schema to be available, it must be configured into the MySQL server at build time. Binary MySQL distributions provided by Oracle Corporation are configured to support the Performance Schema. If you use a binary MySQL distribution from another provider, check with the provider whether the distribution has been appropriately configured.

If you build MySQL from a source distribution, enable the Performance Schema by running CMake with the WITH_PERFSCHEMA_STORAGE_ENGINE option enabled:

shell> cmake .
        -DWITH_PERFSCHEMA_STORAGE_ENGINE=1

Configuring MySQL with the -DWITHOUT_PERFSCHEMA_STORAGE_ENGINE=1 option prevents inclusion of the Performance Schema, so if you want it included, do not use this option. See Section 2.9.4, "MySQL Source-Configuration Options".

If you install MySQL over a previous installation that was configured without the Performance Schema (or with an older version of the Performance Schema that may not have all the current tables), run mysql_upgrade after starting the server to ensure that the performance_schema database exists with all current tables. Then restart the server. One indication that you need to do this is the presence of messages such as the following in the error log:

[ERROR] Native table 'performance_schema'.'events_waits_history'has the wrong structure[ERROR] Native table 'performance_schema'.'events_waits_history_long'has the wrong structure...

To verify whether a server was built with Performance Schema support, check its help output. If the Performance Schema is available, the output will mention several variables with names that begin with performance_schema:

shell> mysqld --verbose --help...  --performance_schema                      Enable the performance schema.  --performance_schema_events_waits_history_long_size=#                      Number of rows in events_waits_history_long....

You can also connect to the server and look for a line that names the PERFORMANCE_SCHEMA storage engine in the output from SHOW ENGINES:

mysql> SHOW ENGINES\G...      Engine: PERFORMANCE_SCHEMA     Support: YES     Comment: Performance SchemaTransactions: NO          XA: NO  Savepoints: NO...

If the Performance Schema was not configured into the server at build time, no row for PERFORMANCE_SCHEMA will appear in the output from SHOW ENGINES. You might see performance_schema listed in the output from SHOW DATABASES, but it will have no tables and you will not be able to use it.

A line for PERFORMANCE_SCHEMA in the SHOW ENGINES output means that the Performance Schema is available, not that it is enabled. To enable it, you must do so at server startup, as described in the next section.