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Apr 21, 2020
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reference: add a description of max-index-length #2303

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reference: add a description of max-index-length
TomShawn Apr 16, 2020
1d0da80
Merge branch 'master' into max-index-length
ran-huang Apr 21, 2020
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19 changes: 13 additions & 6 deletions reference/configuration/tidb-server/configuration-file.md
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Expand Up @@ -104,6 +104,19 @@ The TiDB configuration file supports more options than command-line parameters.
- Default value: []
- The list is empty by default. This means that there are no bad tables that need to be repaired.

### `max-server-connections`

- The maximum number of concurrent client connections allowed in TiDB. It is used to control resources.
- Default value: `0`
- By default, TiDB does not set limit on the number of concurrent client connections. When the value of this configuration item is greater than `0` and the number of actual client connections reaches this value, the TiDB server rejects new client connections.

### `max-index-length`

- Sets the maximum allowable length of the newly created index.
- Default value: `3072`
- Unit: byte
- Currently, the valid value range is `[3072, 3072*4]`. MySQL and TiDB (version < v3.0.11) do not have this configuration item, but both limit the length of the newly created index. This limit in MySQL is `3072`. In TiDB (version =< 3.0.7), this limit is `3072*4`. In TiDB (3.0.7 < version < 3.0.11), this limit is `3072`. This configuration is added to be compatible with MySQL and earlier versions of TiDB.

## Log

Configuration items related to log.
Expand Down Expand Up @@ -157,12 +170,6 @@ Configuration items related to log.
- Default value: `4096`
- When the length of the statement is longer than `query-log-max-len`, the statement is truncated to output.

### `max-server-connections`

- The maximum number of concurrent client connections allowed in TiDB. It is used to control resources.
- Default value: `0`
- By default, TiDB does not set limit on the number of concurrent client connections. When the value of this configuration item is greater than `0` and the number of actual client connections reaches this value, the TiDB server rejects new client connections.

## log.file

Configuration items related to log files.
Expand Down