> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/reference/system-tables/performance-schema/performance-schema-tables/performance-schema-memory_summary_by_thread_by_event_name-table.md).

# 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.

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](/docs/server/reference/system-tables/performance-schema/performance-schema-tables/performance-schema-memory_summary_by_account_by_event_name-table.md)
* [memory\_summary\_by\_host\_by\_event\_name](/docs/server/reference/system-tables/performance-schema/performance-schema-tables/performance-schema-memory_summary_by_host_by_event_name-table.md)
* memory\_summary\_by\_thread\_by\_event\_name
* [memory\_summary\_by\_user\_by\_event\_name](/docs/server/reference/system-tables/performance-schema/performance-schema-tables/performance-schema-memory_summary_by_user_by_event_name-table.md)
* [memory\_global\_by\_event\_name](/docs/server/reference/system-tables/performance-schema/performance-schema-tables/performance-schema-memory_summary_global_by_event_name-table.md)

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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