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Update system-variables.md
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Co-authored-by: Grace Cai <[email protected]>
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JinheLin and qiancai committed Feb 5, 2025
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Expand Up @@ -693,7 +693,7 @@ mysql> SHOW GLOBAL VARIABLES LIKE 'max_prepared_stmt_count';
- `0`:兼容所有 TiDB 集群版本,MPP 版本大于 `0` 的新特性均不会生效。
- `1`:从 v6.6.0 版本开始引入,用于开启 TiFlash 带压缩的数据交换,详情参见 [MPP Version 和 Exchange 数据压缩](/explain-mpp.md#mpp-version-和-exchange-数据压缩)
- `2`:从 v7.3.0 版本开始引入,用于确保在 TiFlash 执行出错的情况下,获取到准确的报错信息。
- `3`:从 v9.0.0 版本开始引入,用于开启 TiFlash 新的字符串数据交换格式,以提升字符串的序列化和反序列化性能
- `3`:从 v9.0.0 版本开始引入,用于开启 TiFlash 新的字符串数据交换格式,以提高字符串的序列化和反序列化效率,从而提升查询性能

### `password_history` <span class="version-mark">从 v6.5.0 版本开始引入</span>

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