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Add description for tidb_distsql_scan_concurrency (#5035) (#5085)
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ti-srebot authored Dec 14, 2020
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Expand Up @@ -443,6 +443,7 @@ SET GLOBAL tidb_distsql_scan_concurrency = 10;
- 默认值:15
- 这个变量用来设置 scan 操作的并发度。
- AP 类应用适合较大的值,TP 类应用适合较小的值。对于 AP 类应用,最大值建议不要超过所有 TiKV 节点的 CPU 核数。
- 若表的分区较多可以适当调小该参数,避免 TiKV 内存溢出 (OOM)。

### `tidb_hash_join_concurrency`

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