The Performance Schema is mandatory and always compiled in. It is possible to exclude certain parts of the Performance Schema instrumentation. For example, to exclude stage and statement instrumentation, do this:
shell> cmake . \ -DDISABLE_PSI_STAGE=1 \ -DDISABLE_PSI_STATEMENT=1
For more information, see the descriptions of the
CMake options in
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was configured without the Performance Schema (or with an older version of the Performance Schema that has missing or out-of-date tables). One indication of this issue 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 correct that problem, perform the MySQL upgrade procedure. See Section 2.11, “Upgrading MySQL”.
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
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. ...
mysql> SHOW ENGINES\G ... Engine: PERFORMANCE_SCHEMA Support: YES Comment: Performance Schema Transactions: 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
SHOW ENGINES. You might
performance_schema listed in the output
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