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ti-chi-bot merged 2 commits into from
Sep 28, 2025
Merged

include storage engines in slow query logs and statements summary #20676

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include storage engines in slow query logs and statements summary
Oreoxmt Jul 18, 2025
2107d15
add new in v9.0.0
Oreoxmt Jul 18, 2025
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5 changes: 5 additions & 0 deletions identify-slow-queries.md
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Expand Up @@ -168,6 +168,11 @@ Slow Query 基础信息：
* `Request_unit_write`：执行语句消耗的总写 RU。
* `Time_queued_by_rc`：执行语句过程中等待可用资源的总耗时。

和存储引擎相关的字段：

- `Storage_from_kv`：表示该语句是否从 TiKV 读取数据。
- `Storage_from_mpp`：表示该语句是否从 TiFlash 读取数据。

## 相关系统变量

* [tidb_slow_log_threshold](/system-variables.md#tidb_slow_log_threshold)：设置慢日志的阈值，执行时间超过阈值的 SQL 语句将被记录到慢日志中。默认值是 300 ms。
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5 changes: 5 additions & 0 deletions statement-summary-tables.md
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Expand Up @@ -385,6 +385,11 @@ SQL 的基础信息：
- `SUM_UNPACKED_BYTES_SENT_TIFLASH_CROSS_ZONE`：SQL 语句向跨可用区 TiFlash 发送的字节数（包含 TiFlash 节点之间跨可用区发送的字节数）
- `SUM_UNPACKED_BYTES_RECEIVED_TIFLASH_CROSS_ZONE`：SQL 语句从跨可用区 TiFlash 接收的字节数（包含 TiFlash 节点之间跨可用区接收的字节数）

和存储引擎相关的字段：

- `STORAGE_KV`：表示该类 SQL 语句上一次执行是否从 TiKV 读取了数据。
- `STORAGE_MPP`：表示该类 SQL 语句上一次执行是否从 TiFlash 读取了数据。

### `statements_summary_evicted` 字段介绍

- `BEGIN_TIME`: 记录的开始时间；
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