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v8.5.5: include storage engines in slow query logs and statements summary (#20676) #21226

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v8.5.5: include storage engines in slow query logs and statements summary (#20676) #21226

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5133a44
This is an automated cherry-pick of #20676
Oreoxmt Sep 28, 2025
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Oreoxmt Dec 31, 2025
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5 changes: 5 additions & 0 deletions identify-slow-queries.md
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Original file line number Diff line number Diff line change
Expand Up @@ -167,6 +167,11 @@ 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`：从 v9.0.0 开始引入，表示该语句是否从 TiKV 读取数据。
- `Storage_from_mpp`：从 v9.0.0 开始引入，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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19 changes: 19 additions & 0 deletions statement-summary-tables.md
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Expand Up @@ -373,6 +373,25 @@ SQL 的基础信息：
- `MAX_QUEUED_RC_TIME`：执行 SQL 语句等待可用 RU 的最大耗时
- `RESOURCE_GROUP`：执行 SQL 语句绑定的资源组

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和网络流量相关的字段：

- `SUM_UNPACKED_BYTES_SENT_TIKV_TOTAL`：SQL 语句向 TiKV 发送的总字节数
- `SUM_UNPACKED_BYTES_RECEIVED_TIKV_TOTAL`：SQL 语句从 TiKV 接收的总字节数
- `SUM_UNPACKED_BYTES_SENT_TIKV_CROSS_ZONE`：SQL 语句向跨可用区 TiKV 发送的字节数
- `SUM_UNPACKED_BYTES_RECEIVED_TIKV_CROSS_ZONE`：SQL 语句从跨可用区 TiKV 接收的字节数
- `SUM_UNPACKED_BYTES_SENT_TIFLASH_TOTAL`：SQL 语句向 TiFlash 发送的总字节数（包含 TiFlash 节点之间发送的字节数）
- `SUM_UNPACKED_BYTES_RECEIVED_TIFLASH_TOTAL`：SQL 语句从 TiFlash 接收的总字节数（包含 TiFlash 节点之间接收的字节数）
- `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`：从 v9.0.0 开始引入，表示该类 SQL 语句上一次执行是否从 TiKV 读取了数据。
- `STORAGE_MPP`：从 v9.0.0 开始引入，表示该类 SQL 语句上一次执行是否从 TiFlash 读取了数据。

>>>>>>> 18121a08dd (include storage engines in slow query logs and statements summary (#20676))
### `statements_summary_evicted` 字段介绍

- `BEGIN_TIME`: 记录的开始时间；
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