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## 28.4.4.7 The ps_setup_disable_thread() Procedure 

mysql> CALL sys.ps_setup_disable_instrument(’wait/lock/metadata/sql/mdl’); 

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Disable all mutex instruments: 

mysql> CALL sys.ps_setup_disable_instrument(’mutex’); 

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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. 

## Parameters 

• 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. 

## Example 

Disable a specific connection by its connection ID: 

mysql> CALL sys.ps_setup_disable_thread(225); 

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Disable the current connection: 

mysql> CALL sys.ps_setup_disable_thread(CONNECTION_ID()); 

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## 28.4.4.8 The ps_setup_enable_background_threads() Procedure 

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. 

## Parameters 

## Example 

None. 

