18.104.22.168 The setup_actors Table
setup_actors table contains information that determines whether to enable monitoring and historical event logging for new foreground server threads (threads associated with client connections). This table has a maximum size of 100 rows by default. To change the table size, modify the
performance_schema_setup_actors_size system variable at server startup.
For each new foreground thread, the Performance Schema matches the user and host for the thread against the rows of the
setup_actors table. If a row from that table matches, its
HISTORY column values are used to set the
HISTORY columns, respectively, of the
threads table row for the thread. This enables instrumenting and historical event logging to be applied selectively per host, user, or account (user and host combination). If there is no match, the
HISTORY columns for the thread are set to
For background threads, there is no associated user.
YES by default and
setup_actors is not consulted.
The initial contents of the
setup_actors table match any user and host combination, so monitoring and historical event collection are enabled by default for all foreground threads:
mysql> SELECT * FROM performance_schema.setup_actors; +------+------+------+---------+---------+ | HOST | USER | ROLE | ENABLED | HISTORY | +------+------+------+---------+---------+ | % | % | % | YES | YES | +------+------+------+---------+---------+
Modifications to the
setup_actors table affect only foreground threads created subsequent to the modification, not existing threads. To affect existing threads, modify the
HISTORY columns of
threads table rows.
setup_actors table has these columns:
The host name. This should be a literal name, or
'%'to mean “any host.”
The user name. This should be a literal name, or
'%'to mean “any user.”
Whether to enable instrumentation for foreground threads matched by the row. The value is
Whether to log historical events for foreground threads matched by the row. The value is