統計_ヒストグラムを表示

このステートメントは、 ANALYZEステートメントによって収集されたヒストグラム情報を表示します。

あらすじ

ShowStmt

ShowStmt

ShowTargetFiltertable

ShowTargetFilterable

ShowLikeOrWhereOpt

ShowLikeOrWhereOpt

show stats_histograms;
+---------+------------+----------------+-------------+----------+---------------------+----------------+------------+--------------+-------------+ | Db_name | Table_name | Partition_name | Column_name | Is_index | Update_time | Distinct_count | Null_count | Avg_col_size | Correlation | +---------+------------+----------------+-------------+----------+---------------------+----------------+------------+--------------+-------------+ | test | t | | a | 0 | 2020-05-25 19:20:00 | 7 | 0 | 1 | 1 | | test | t2 | | a | 0 | 2020-05-25 19:20:01 | 6 | 0 | 8 | 0 | | test | t2 | | b | 0 | 2020-05-25 19:20:01 | 6 | 0 | 1.67 | 1 | +---------+------------+----------------+-------------+----------+---------------------+----------------+------------+--------------+-------------+ 3 rows in set (0.00 sec)
show stats_histograms where table_name = 't2';
+---------+------------+----------------+-------------+----------+---------------------+----------------+------------+--------------+-------------+ | Db_name | Table_name | Partition_name | Column_name | Is_index | Update_time | Distinct_count | Null_count | Avg_col_size | Correlation | +---------+------------+----------------+-------------+----------+---------------------+----------------+------------+--------------+-------------+ | test | t2 | | b | 0 | 2020-05-25 19:20:01 | 6 | 0 | 1.67 | 1 | | test | t2 | | a | 0 | 2020-05-25 19:20:01 | 6 | 0 | 8 | 0 | +---------+------------+----------------+-------------+----------+---------------------+----------------+------------+--------------+-------------+ 2 rows in set (0.00 sec)

MySQL の互換性

このステートメントは、MySQL 構文に対する TiDB 拡張です。

こちらもご覧ください