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reference: add a description of max-index-length (#2303) #2352

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Apr 21, 2020
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reference: add a description of max-index-length (#2303) #2352

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c152da8
cherry pick #2303 to release-3.0
TomShawn Apr 21, 2020
feaca9c
resolve conflict
TomShawn Apr 21, 2020
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7 changes: 7 additions & 0 deletions reference/configuration/tidb-server/configuration-file.md
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Expand Up @@ -80,6 +80,13 @@ The TiDB configuration file supports more options than command-line parameters.
+ Default value: ""
+ By default, the format of the TiDB version string is `5.7.${mysql_latest_minor_version}-TiDB-${tidb_version}`.

### `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

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