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cached table: clarify usage scenarios (#15926) #15930

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Dec 27, 2023
Merged

cached table: clarify usage scenarios (#15926) #15930

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cached table: clarify usage scenarios
Oreoxmt Dec 27, 2023
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Oreoxmt Dec 27, 2023
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6 changes: 3 additions & 3 deletions cached-tables.md
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Expand Up @@ -13,9 +13,9 @@ TiDB 在 v6.0.0 版本中引入了缓存表功能。该功能适用于频繁被

TiDB 缓存表功能适用于以下特点的表：

- 表的数据量不大
- 只读表，或者几乎很少修改
- 表的访问很频繁，期望有更好的读性能
- 表的数据量不大，例如 4 MiB 以下
- 只读表，或者几乎很少修改，例如写入 QPS 低于每分钟 10 次
- 表的访问很频繁，期望有更好的读性能，例如在直接读取 TiKV 时遇到小表热点瓶颈

当表的数据量不大，访问又特别频繁的情况下，数据会集中在 TiKV 一个 Region 上，形成热点，从而影响性能。因此，TiDB 缓存表的典型使用场景如下：

Expand Down