Update description of MAX_WRITE_SPEED
#20258
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May 7, 2025
| @@ -146,7 +146,7 @@ SET 表达式左侧只能引用 `ColumnNameOrUserVarList` 中没有的列名。 | |||
| | `DISK_QUOTA='<string>'` | 所有文件格式 | 指定数据排序期间可使用的磁盘空间阈值。默认值为 TiDB [临时目录](/tidb-configuration-file.md#temp-dir-从-v630-版本开始引入)所在磁盘空间的 80%。如果无法获取磁盘总大小，默认值为 50 GiB。当显式指定 `DISK_QUOTA` 时，该值同样不能超过 TiDB [临时目录](/tidb-configuration-file.md#temp-dir-从-v630-版本开始引入)所在磁盘空间的 80%。 | | |||
| | `DISABLE_TIKV_IMPORT_MODE` | 所有文件格式 | 指定是否禁止导入期间将 TiKV 切换到导入模式。默认不禁止。如果当前集群存在正在运行的读写业务，为避免导入过程对这部分业务造成影响，可开启该参数。 | | |||
| | `THREAD=<number>` | 所有文件格式、`SELECT` 语句的查询结果 | 指定导入的并发度。对于 `IMPORT INTO ... FROM FILE`，`THREAD` 默认值为 TiDB 节点的 CPU 核数的 50%，最小值为 `1`，最大值为 CPU 核数；对于 `IMPORT INTO ... FROM SELECT`，`THREAD` 默认值为 `2`，最小值为 `1`，最大值为 TiDB 节点的 CPU 核数的 2 倍。如需导入数据到一个空集群，建议可以适当调大该值，以提升导入性能。如果目标集群已经用于生产环境，请根据业务要求按需调整该参数值。 | | |||
| | `MAX_WRITE_SPEED='<string>'` | 所有文件格式 | 控制写入到单个 TiKV 的速度，默认无速度限制。例如设置为 `1MiB`，则限制写入速度为 1 MiB/s。| | |||
| | `MAX_WRITE_SPEED='<string>'` | 所有文件格式 | 控制每个 TiDB 节点向 TiKV 的写入速度，默认无速度限制。例如设置为 `1MiB`，则限制写入速度为 1 MiB/s。| | |||
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MAX_WRITE_SPEEDdocs#20852Do your changes match any of the following descriptions?