Performance Schema table_io_waits_summary_by_table Table - Source

Revision: 109871
User: Ian Gilfillan
Date: 2021-09-07 09:29

The ##table_io_waits_summary_by_table## table records table I/O waits by table.

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|= Column |= Description |
| ##OBJECT_TYPE## | Since this table records waits by table, always set to ##TABLE##. |
| ##OBJECT_SCHEMA## | Schema name. |
| ##OBJECT_NAME## | Table name. |
| ##COUNT_STAR## | Number of summarized events and the sum of the ##x_READ## and ##x_WRITE## columns. |
| ##SUM_TIMER_WAIT## | Total wait time of the summarized events that are timed. |
| ##MIN_TIMER_WAIT## | Minimum wait time of the summarized events that are timed. | 
| ##AVG_TIMER_WAIT## | Average wait time of the summarized events that are timed. |
| ##MAX_TIMER_WAIT## | Maximum wait time of the summarized events that are timed. |
| ##COUNT_READ## | Number of all read operations, and the sum of the equivalent ##x_FETCH## columns. |
| ##SUM_TIMER_READ## | Total wait time of all read operations that are timed. |
| ##MIN_TIMER_READ## | Minimum wait time of all read operations that are timed. |
| ##AVG_TIMER_READ## | Average wait time of all read operations that are timed. |
| ##MAX_TIMER_READ## | Maximum wait time of all read operations that are timed. |
| ##COUNT_WRITE## | Number of all write operations, and the sum of the equivalent ##x_INSERT##, ##x_UPDATE## and ##x_DELETE## columns.|
| ##SUM_TIMER_WRITE## | Total wait time of all write operations that are timed. |
| ##MIN_TIMER_WRITE## | Minimum wait time of all write operations that are timed. |
| ##AVG_TIMER_WRITE## | Average wait time of all write operations that are timed. |
| ##MAX_TIMER_WRITE## | Maximum wait time of all write operations that are timed. |
| ##COUNT_FETCH## | Number of all fetch operations. |
| ##SUM_TIMER_FETCH## | Total wait time of all fetch operations that are timed. |
| ##MIN_TIMER_FETCH## | Minimum wait time of all fetch operations that are timed. |
| ##AVG_TIMER_FETCH## | Average wait time of all fetch operations that are timed. |
| ##MAX_TIMER_FETCH## | Maximum wait time of all fetch operations that are timed. |
| ##COUNT_INSERT## | Number of all insert operations. |
| ##SUM_TIMER_INSERT## | Total wait time of all insert operations that are timed. |
| ##MIN_TIMER_INSERT## | Minimum wait time of all insert operations that are timed. |
| ##AVG_TIMER_INSERT## | Average wait time of all insert operations that are timed. |
| ##MAX_TIMER_INSERT## | Maximum wait time of all insert operations that are timed. |
| ##COUNT_UPDATE## | Number of all update operations. |
| ##SUM_TIMER_UPDATE## | Total wait time of all update operations that are timed. |
| ##MIN_TIMER_UPDATE## | Minimum wait time of all update operations that are timed. |
| ##AVG_TIMER_UPDATE## | Average wait time of all update operations that are timed. |
| ##MAX_TIMER_UPDATE## | Maximum wait time of all update operations that are timed. |
| ##COUNT_DELETE## | Number of all delete operations. |
| ##SUM_TIMER_DELETE## | Total wait time of all delete operations that are timed. |
| ##MIN_TIMER_DELETE## | Minimum wait time of all delete operations that are timed. |
| ##AVG_TIMER_DELETE## | Average wait time of all delete operations that are timed. |
| ##MAX_TIMER_DELETE## | Maximum wait time of all delete operations that are timed. |
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You can [[truncate-table|TRUNCATE]] the table, which will reset all counters to zero. Truncating this table will also truncate the [[performance-schema-table_io_waits_summary_by_index_usage-table|table_io_waits_summary_by_index_usage]] table.

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