SHOW ANALYZE STATUS

SHOW ANALYZE STATUS 语句提供 TiDB 正在执行的统计信息收集任务以及有限条历史任务记录。

从 TiDB v6.1.0 起,执行 SHOW ANALYZE STATUS 语句将显示集群级别的任务,且 TiDB 重启后仍能看到重启之前的任务记录。在 TiDB v6.1.0 之前,执行 SHOW ANALYZE STATUS 语句仅显示实例级别的任务,且 TiDB 重启后任务记录会被清空。

从 TiDB v6.1.0 起,你可以通过系统表 mysql.analyze_jobs 查看过去 7 天内的历史记录。

语法图

ShowAnalyzeStatusStmt
SHOWANALYZESTATUSShowLikeOrWhereOpt
ShowLikeOrWhereOpt
LIKESimpleExprWHEREExpression

示例

mysql> create table t(x int, index idx(x)) partition by hash(x) partitions 2;
Query OK, 0 rows affected (0.69 sec)

mysql> set @@tidb_analyze_version = 1;
Query OK, 0 rows affected (0.00 sec)

mysql> analyze table t;
Query OK, 0 rows affected (0.20 sec)

mysql> show analyze status;
+--------------+------------+----------------+-------------------+----------------+---------------------+---------------------+----------+-------------+----------------+------------+
| Table_schema | Table_name | Partition_name | Job_info          | Processed_rows | Start_time          | End_time            | State    | Fail_reason | Instance       | Process_ID |
+--------------+------------+----------------+-------------------+----------------+---------------------+---------------------+----------+-------------+----------------+------------+
| test         | t          | p1             | analyze index idx |              0 | 2022-05-27 11:29:46 | 2022-05-27 11:29:46 | finished | NULL        | 127.0.0.1:4000 |       NULL |
| test         | t          | p0             | analyze index idx |              0 | 2022-05-27 11:29:46 | 2022-05-27 11:29:46 | finished | NULL        | 127.0.0.1:4000 |       NULL |
| test         | t          | p1             | analyze columns   |              0 | 2022-05-27 11:29:46 | 2022-05-27 11:29:46 | finished | NULL        | 127.0.0.1:4000 |       NULL |
| test         | t          | p0             | analyze columns   |              0 | 2022-05-27 11:29:46 | 2022-05-27 11:29:46 | finished | NULL        | 127.0.0.1:4000 |       NULL |
+--------------+------------+----------------+-------------------+----------------+---------------------+---------------------+----------+-------------+----------------+------------+
4 rows in set (0.01 sec)

mysql> set @@tidb_analyze_version = 2;
Query OK, 0 rows affected (0.00 sec)

mysql> analyze table t;
Query OK, 0 rows affected, 2 warnings (0.03 sec)

mysql> show analyze status;
+--------------+------------+----------------+--------------------------------------------------------------------+----------------+---------------------+---------------------+----------+-------------+----------------+------------+
| Table_schema | Table_name | Partition_name | Job_info                                                           | Processed_rows | Start_time          | End_time            | State    | Fail_reason | Instance       | Process_ID |
+--------------+------------+----------------+--------------------------------------------------------------------+----------------+---------------------+---------------------+----------+-------------+----------------+------------+
| test         | t          | p1             | analyze table all columns with 256 buckets, 500 topn, 1 samplerate |              0 | 2022-05-27 11:30:12 | 2022-05-27 11:30:12 | finished | NULL        | 127.0.0.1:4000 |       NULL |
| test         | t          | p0             | analyze table all columns with 256 buckets, 500 topn, 1 samplerate |              0 | 2022-05-27 11:30:12 | 2022-05-27 11:30:12 | finished | NULL        | 127.0.0.1:4000 |       NULL |
| test         | t          | p1             | analyze index idx                                                  |              0 | 2022-05-27 11:29:46 | 2022-05-27 11:29:46 | finished | NULL        | 127.0.0.1:4000 |       NULL |
| test         | t          | p0             | analyze index idx                                                  |              0 | 2022-05-27 11:29:46 | 2022-05-27 11:29:46 | finished | NULL        | 127.0.0.1:4000 |       NULL |
| test         | t          | p1             | analyze columns                                                    |              0 | 2022-05-27 11:29:46 | 2022-05-27 11:29:46 | finished | NULL        | 127.0.0.1:4000 |       NULL |
| test         | t          | p0             | analyze columns                                                    |              0 | 2022-05-27 11:29:46 | 2022-05-27 11:29:46 | finished | NULL        | 127.0.0.1:4000 |       NULL |
+--------------+------------+----------------+--------------------------------------------------------------------+----------------+---------------------+---------------------+----------+-------------+----------------+------------+
6 rows in set (0.00 sec)

MySQL 兼容性

该语句是 TiDB 对 MySQL 语法的扩展。

另请参阅

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