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Update system-variables.md
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Co-authored-by: Grace Cai <[email protected]>
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2 people authored and ti-chi-bot committed Dec 10, 2024
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Expand Up @@ -1253,7 +1253,7 @@ MPP 是 TiFlash 引擎提供的分布式计算框架,允许节点之间的数
- 默认值:`0`
- 范围:`[0, 1125899906842624]`(即最大可设置为 1 PiB)
- 这个变量用于限制每个 TiKV 节点写入的带宽,仅在开启添加索引加速功能时生效(由变量 [`tidb_ddl_enable_fast_reorg`](#tidb_ddl_enable_fast_reorg-从-v630-版本开始引入) 控制)。在数据量特别大的情况下(如数十亿行数据),降低加索引时写入 TiKV 节点的带宽可以有效减少对业务负载的影响。
- 默认值 `0` 表示不限制写入带宽。默认单位为字节每秒,也可以通过 `'1GiB'``256MiB` 等格式设置该变量。
- 默认值 `0` 表示不限制写入带宽。默认单位为字节每秒,也可以通过 `'1GiB'``'256MiB'` 等格式设置该变量。
### `tidb_ddl_reorg_worker_cnt`
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