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sql: add retry-time #764

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Jun 13, 2018
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sql: add retry-time #764

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sql: add retry-time
zimulala Jun 13, 2018
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sql: address comment
zimulala Jun 13, 2018
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8 changes: 8 additions & 0 deletions sql/tidb-specific.md
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Expand Up @@ -277,6 +277,14 @@ TiDB 在 MySQL 的基础上，定义了一些专用的系统变量和语法用

这个变量用来设置是否启用 Streaming。

### tidb_retry_limit

作用域：SESSION | GLOBAL

默认值：10

这个变量用来设置最多可重试次数, 即在一个事务执行中遇到可重试的错误(例如事务冲突、TiKV 繁忙等)时，这个事务可以被重新执行，这个变量值表明最多可重试的次数。

## Optimizer Hint

TiDB 在 MySQL 的 Optimizer Hint 语法上，增加了一些 TiDB 专有的 Hint 语法, 使用这些 Hint 的时候，TiDB 优化器会尽量使用指定的算法，在某些场景下会比默认算法更优。
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