# Performance Schema table\_io\_waits\_summary\_by\_table Table

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

| 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.                                                |

You can [TRUNCATE](/docs/server/reference/sql-statements/table-statements/truncate-table.md) the table, which will reset all counters to zero. Truncating this table will also truncate the [table\_io\_waits\_summary\_by\_index\_usage](/docs/server/reference/system-tables/performance-schema/performance-schema-tables/performance-schema-table_io_waits_summary_by_index_usage-table.md) table.

<sub>*This page is licensed: CC BY-SA / Gnu FDL*</sub>

{% @marketo/form formId="4316" %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://mariadb.com/docs/server/reference/system-tables/performance-schema/performance-schema-tables/performance-schema-table_io_waits_summary_by_table-table.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.