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slow-query: add Warnings field to slow log and the slow query table #12638

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Feb 10, 2023
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slow-query: add Warnings field to slow log and the slow query table #12638

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Merge remote-tracking branch 'upstream/master' into s13-add-warning-t…
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Update identify-slow-queries.md
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Oreoxmt Feb 1, 2023
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1 change: 1 addition & 0 deletions identify-slow-queries.md
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,7 @@ Slow Query 基础信息：
* `Backoff_total`：表示这个语句在执行过程中所有 backoff 花费的时间。
* `Write_sql_response_total`：表示这个语句把结果发送回客户端花费的时间。
* `Result_rows`：表示这个语句查询结果的行数。
* `Warnings`：以 JSON 格式表示的该语句执行过程中产生的警告。通常和 [`SHOW WARNINGS`](/sql-statements/sql-statement-show-warnings.md) 语句的输出结果一致，但是可能会包含 [`SHOW WARNINGS`](/sql-statements/sql-statement-show-warnings.md) 中没有出现的警告来提供更多诊断信息。这类警告将被标记为 `IsExtra: true`。
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* `IsExplicitTxn`：表示这个语句是否在一个明确声明的事务中。如果是 `false`，表示这个语句的事务是 `autocommit=1`，即语句执行完成后就自动提交的事务。

和事务执行相关的字段：
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6 changes: 4 additions & 2 deletions information-schema/information-schema-slow-query.md
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Expand Up @@ -78,6 +78,7 @@ DESC slow_query;
| Backoff_total | double | YES | | NULL | |
| Write_sql_response_total | double | YES | | NULL | |
| Result_rows | bigint(22) | YES | | NULL | |
| Warnings | longtext | YES | | NULL | |
| Backoff_Detail | varchar(4096) | YES | | NULL | |
| Prepared | tinyint(1) | YES | | NULL | |
| Succ | tinyint(1) | YES | | NULL | |
Expand All @@ -92,7 +93,7 @@ DESC slow_query;
| Prev_stmt | longtext | YES | | NULL | |
| Query | longtext | YES | | NULL | |
+-------------------------------+---------------------+------+------+---------+-------+
73 rows in set (0.000 sec)
74 rows in set (0.001 sec)
```

## CLUSTER_SLOW_QUERY table
Expand Down Expand Up @@ -170,6 +171,7 @@ desc cluster_slow_query;
| Backoff_total | double | YES | | NULL | |
| Write_sql_response_total | double | YES | | NULL | |
| Result_rows | bigint(22) | YES | | NULL | |
| Warnings | longtext | YES | | NULL | |
| Backoff_Detail | varchar(4096) | YES | | NULL | |
| Prepared | tinyint(1) | YES | | NULL | |
| Succ | tinyint(1) | YES | | NULL | |
Expand All @@ -184,7 +186,7 @@ desc cluster_slow_query;
| Prev_stmt | longtext | YES | | NULL | |
| Query | longtext | YES | | NULL | |
+-------------------------------+---------------------+------+------+---------+-------+
74 rows in set (0.000 sec)
75 rows in set (0.001 sec)
```

查询集群系统表时，TiDB 也会将相关计算下推给其他节点执行，而不是把所有节点的数据都取回来，可以查看执行计划，如下：
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