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Update system-variables.md
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Co-authored-by: Roger Song <[email protected]>
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qw4990 and songrijie committed Sep 18, 2024
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Expand Up @@ -3004,7 +3004,7 @@ v5.0 后,用户仍可以单独修改以上系统变量(会有废弃警告)
- 是否受 Hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value) 控制:否
- 类型:整数型
- 默认值:`125829120`(即 120 MiB)
- 这个变量用于设置 Instance Plan Cache 的最大内存使用量。
- 这个变量用于设置 Instance Plan Cache 的最大内存使用量,单位是字节

### `tidb_isolation_read_engines` <span class="version-mark">从 v4.0 版本开始引入</span>

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