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