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reference: add a description of max-index-length (#2748) #2765

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Apr 15, 2020
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reference: add a description of max-index-length (#2748) #2765

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97529a4
cherry pick #2748 to release-3.1
zimulala Apr 15, 2020
af0307d
*: fix conflicts
zimulala Apr 15, 2020
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7 changes: 7 additions & 0 deletions reference/configuration/tidb-server/configuration-file.md
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Expand Up @@ -79,6 +79,13 @@ TiDB 配置文件比命令行参数支持更多的选项。你可以在 [config/
+ 默认值：""
+ 默认情况下，TiDB 版本号格式为：`5.7.${mysql_latest_minor_version}-TiDB-${tidb_version}`。

### `max-index-length`

+ 用于设置新建索引的长度限制。
+ 默认值：3072
+ 单位：byte。
+ 目前的合法值范围 `[3072, 3072*4]`。MySQL 和 TiDB v3.0.11 之前版本（不包含 v3.0.11）没有此配置项，不过都对新建索引的长度做了限制。MySQL 对此的长度限制为 `3072`，TiDB 在 v3.0.7 以及之前版本该值为 `3072*4`，在 v3.0.7 之后版本（包含 v3.0.8、v3.0.9 和 v3.0.10）的该值为 `3072`。为了与 MySQL 和 TiDB 之前版本的兼容，添加了此配置项。

## log

日志相关的配置项。
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