Performance Schema memory_summary_by_thread_by_event_name Table

This table summarizes memory usage events aggregated by thread and event name, allowing for detailed memory profiling of individual threads.

The memory_summary_by_thread_by_event_name table is available from MariaDB 10.5.2.

There are five memory summary tables in the Performance Schema that share a number of fields in common. These include:

• memory_summary_by_account_by_event_name

• memory_summary_by_host_by_event_name

• memory_summary_by_thread_by_event_name

• memory_summary_by_user_by_event_name

• memory_global_by_event_name

The memory_summary_by_thread_by_event_name table contains memory usage statistics aggregated by thread and event.

The table contains the following columns:

Field	Type	Null	Default	Description
THREAD_ID	bigint(20) unsigned	NO	NULL	Thread id.
EVENT_NAME	varchar(128)	NO	NULL	Event name.
COUNT_ALLOC	bigint(20) unsigned	NO	NULL	Total number of allocations to memory.
COUNT_FREE	bigint(20) unsigned	NO	NULL	Total number of attempts to free the allocated memory.
SUM_NUMBER_OF_BYTES_ALLOC	bigint(20) unsigned	NO	NULL	Total number of bytes allocated.
SUM_NUMBER_OF_BYTES_FREE	bigint(20) unsigned	NO	NULL	Total number of bytes freed
LOW_COUNT_USED	bigint(20)	NO	NULL	Lowest number of allocated blocks (lowest value of CURRENT_COUNT_USED).
CURRENT_COUNT_USED	bigint(20)	NO	NULL	Currently allocated blocks that have not been freed (COUNT_ALLOC minus COUNT_FREE).
HIGH_COUNT_USED	bigint(20)	NO	NULL	Highest number of allocated blocks (highest value of CURRENT_COUNT_USED).
LOW_NUMBER_OF_BYTES_USED	bigint(20)	NO	NULL	Lowest number of bytes used.
CURRENT_NUMBER_OF_BYTES_USED	bigint(20)	NO	NULL	Current number of bytes used (total allocated minus total freed).
HIGH_NUMBER_OF_BYTES_USED	bigint(20)	NO	NULL	Highest number of bytes used.

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