sys Schema Stored Procedures Disable all mutex instruments: mysql>  CALL sys.ps_setup_disable_instrument(’wait/lock/metadata/sql/mdl’); mysql>  CALL sys.ps_setup_disable_instrument(’mutex’); +-----------------------+ | summary | +-----------------------+ | Disabled 1 instrument | +-----------------------+ +--------------------------+ | summary | +--------------------------+ | Disabled 177 instruments | +--------------------------+ +-------------------+ | summary | +-------------------+ | Disabled 1 thread | +-------------------+ +-------------------+ | summary | +-------------------+ | Disabled 1 thread | +-------------------+ mysql>  CALL sys.ps_setup_disable_thread(CONNECTION_ID()); mysql>  CALL sys.ps_setup_disable_thread(225); 28.4.4.7 The ps_setup_disable_thread() Procedure Parameters Example Given a connection ID, disables Performance Schema instrumentation for the thread. Produces a result set indicating how many threads were disabled. Already disabled threads do not count. • in_connection_id BIGINT : The connection ID. This is a value of the type given in the PROCESSLIST_ID  column of the Performance Schema  threads  table or the  Id  column of  SHOW PROCESSLIST  output. Disable a specific connection by its connection ID: Disable the current connection: Enables Performance Schema instrumentation for all background threads. Produces a result set indicating how many background threads were enabled. Already enabled threads do not count. None. 28.4.4.8 The ps_setup_enable_background_threads() Procedure Parameters Example 5187