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Refine slow log description (#18366) #18650

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merged 5 commits into from
Aug 20, 2024
Merged

Refine slow log description (#18366) #18650

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322d130
This is an automated cherry-pick of #18366
lilin90 Aug 20, 2024
72c81f3
Update system-variables.md
lilin90 Aug 20, 2024
fd0a7fc
Update tidb-configuration-file.md
lilin90 Aug 20, 2024
789384a
Merge branch 'cherry-pick-18366-to-release-6.1' of https://github.com…
lilin90 Aug 20, 2024
e882c29
Update tidb-configuration-file.md
lilin90 Aug 20, 2024
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2 changes: 1 addition & 1 deletion system-variables.md
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Expand Up @@ -2865,7 +2865,7 @@ Query OK, 0 rows affected, 1 warning (0.00 sec)
- Default value: `300`
- Range: `[-1, 9223372036854775807]`
- Unit: Milliseconds
- This variable is used to output the threshold value of the time consumed by the slow log. When the time consumed by a query is larger than this value, this query is considered as a slow log and its log is output to the slow query log.
- This variable outputs the threshold value of the time consumed by the slow log, and is set to 300 milliseconds by default. When the time consumed by a query is larger than this value, this query is considered as a slow query and its log is output to the slow query log. Note that when the output level of [`log.level`](https://docs.pingcap.com/tidb/v6.1/tidb-configuration-file#level) is `"debug"`, all queries are recorded in the slow query log, regardless of the setting of this variable.

### tidb_max_tiflash_threads <span class="version-mark">New in v6.1.0</span>

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6 changes: 4 additions & 2 deletions tidb-configuration-file.md
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Expand Up @@ -231,7 +231,8 @@ Configuration items related to log.
- Outputs the threshold value of consumed time in the slow log.
- Default value: `300`
- Unit: Milliseconds
- If the value in a query is larger than the default value, it is a slow query and is output to the slow log.
- When the time consumed by a query is larger than this value, this query is considered as a slow query and its log is output to the slow query log. Note that when the output level of [`log.level`](#level) is `"debug"`, all queries are recorded in the slow query log, regardless of the setting of this parameter.
- Since v6.1.0, the threshold value of consumed time in the slow log is specified by the TiDB configuration item [`instance.tidb_slow_log_threshold`](#tidb_slow_log_threshold) or the system variable [`tidb_slow_log_threshold`](/system-variables.md#tidb_slow_log_threshold). `slow-threshold` still takes effect. But if `slow-threshold` and `instance.tidb_slow_log_threshold` are set at the same time, the latter takes effect.

### `record-plan-in-slow-log`

Expand Down Expand Up @@ -743,10 +744,11 @@ Configuration items related to read isolation.

### `tidb_slow_log_threshold`

- This configuration is used to output the threshold value of the time consumed by the slow log. When the time consumed by a query is larger than this value, this query is considered as a slow log and its log is output to the slow query log.
- Outputs the threshold value of the time consumed by the slow log.
- Default value: `300`
- Range: `[-1, 9223372036854775807]`
- Unit: Milliseconds
- When the time consumed by a query is larger than this value, this query is considered as a slow query and its log is output to the slow query log. Note that when the output level of [`log.level`](#level) is `"debug"`, all queries are recorded in the slow query log, regardless of the setting of this parameter.
- Before v6.1.0, this configuration is set by `slow-threshold`.

### `tidb_expensive_query_time_threshold`
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