diff --git a/sql-statements/sql-statement-drop-stats.md b/sql-statements/sql-statement-drop-stats.md index 00e5a5cec68cc..980d9333bada0 100644 --- a/sql-statements/sql-statement-drop-stats.md +++ b/sql-statements/sql-statement-drop-stats.md @@ -65,11 +65,11 @@ SHOW STATS_META WHERE db_name='test' and table_name='t'; ``` ``` -+---------+------------+----------------+---------------------+--------------+-----------+ -| Db_name | Table_name | Partition_name | Update_time | Modify_count | Row_count | -+---------+------------+----------------+---------------------+--------------+-----------+ -| test | t | | 2020-05-25 20:34:33 | 0 | 0 | -+---------+------------+----------------+---------------------+--------------+-----------+ ++---------+------------+----------------+---------------------+--------------+-----------+-------------------+ +| Db_name | Table_name | Partition_name | Update_time | Modify_count | Row_count | Last_analyze_time | ++---------+------------+----------------+---------------------+--------------+-----------+-------------------+ +| test | t | | 2020-05-25 20:34:33 | 0 | 0 | NULL | ++---------+------------+----------------+---------------------+--------------+-----------+-------------------+ 1 row in set (0.00 sec) ``` @@ -81,12 +81,19 @@ DROP STATS t; Query OK, 0 rows affected (0.00 sec) ``` +`DROP STATS` deletes statistics such as TopN and histogram buckets of the table, but does not delete the record of the table from `STATS_META`. Therefore, after you execute `DROP STATS`, `SHOW STATS_META` still returns the `Modify_count` and `Row_count` information of the table. + ```sql SHOW STATS_META WHERE db_name='test' and table_name='t'; ``` ``` -Empty set (0.00 sec) ++---------+------------+----------------+---------------------+--------------+-----------+-------------------+ +| Db_name | Table_name | Partition_name | Update_time | Modify_count | Row_count | Last_analyze_time | ++---------+------------+----------------+---------------------+--------------+-----------+-------------------+ +| test | t | | 2020-05-25 20:34:33 | 0 | 0 | NULL | ++---------+------------+----------------+---------------------+--------------+-----------+-------------------+ +1 row in set (0.00 sec) ``` ## MySQL compatibility