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system-variables: update from generated source #6451

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Sep 14, 2021
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system-variables: update from generated source #6451

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system-variables: update from generated source
morgo Sep 10, 2021
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Update system-variables.md
morgo Sep 14, 2021
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8 changes: 5 additions & 3 deletions system-variables.md
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Expand Up @@ -1201,7 +1201,7 @@ SET tidb_query_log_max_len = 20

### tidb_replica_read <span class="version-mark">New in v4.0</span>

- Scope: SESSION
- Scope: SESSION | GLOBAL
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From pingcap/tidb#27622

- Default value: `leader`
- Possible values: `leader`, `follower`, `leader-and-follower`
- This variable is used to control where TiDB reads data. Here are three options:
Expand Down Expand Up @@ -1320,7 +1320,8 @@ SET tidb_slow_log_threshold = 200;
- Scope: SESSION | GLOBAL
- Default value: `1800`
- Range: `[1, 2147483647]`
- This variable is used to set the refresh time of [statement summary tables](/statement-summary-tables.md). The unit is second.
- Unit: Seconds
- This variable is used to set the refresh time of [statement summary tables](/statement-summary-tables.md).

### tidb_store_limit <span class="version-mark">New in v3.0.4 and v4.0</span>

Expand Down Expand Up @@ -1358,7 +1359,8 @@ SET tidb_slow_log_threshold = 200;
- Scope: SESSION
- Default value: `300`
- Range: `[1, 2147483647]`
- This variable is used to set the timeout for executing the `SPLIT REGION` statement. The unit is second. If a statement is not executed completely within the specified time value, a timeout error is returned.
- Unit: Seconds
- This variable is used to set the timeout for executing the `SPLIT REGION` statement. If a statement is not executed completely within the specified time value, a timeout error is returned.

### tidb_window_concurrency <span class="version-mark">New in v4.0</span>

Expand Down