标签：统计信息 warnings class mat inno dex com and record
1.在world数据库中新建一个名为city_temp的表，该表示city表的副本，将city表的内容插入city_temp表中。
mysql> create table city_temp like city; Query OK, 0 rows affected (0.10 sec) mysql> insert into city_temp select * from city; Query OK, 4080 rows affected (0.46 sec) Records: 4080 Duplicates: 0 Warnings: 0
2.通过使用id列删除city_temp表数据中的多个行来创建‘洞’（删除或更新产生的行间隔）。
mysql> delete from city_temp where id between 1001 and 2000; Query OK, 1000 rows affected (0.18 sec)
mysql> show table status like ‘city_temp‘\G *************************** 1. row *************************** Name: city_temp Engine: InnoDB Version: 10 Row_format: Compact Rows: 3080 Avg_row_length: 106 Data_length: 327680 Max_data_length: 0 Index_length: 98304 Data_free: 0 Auto_increment: 4081 Create_time: 2016-11-05 04:18:28 Update_time: NULL Check_time: NULL Collation: latin1_swedish_ci Checksum: NULL Create_options: Comment: 1 row in set (0.00 sec)
3.通过对city_temp表运行analize table 来更新表的统计信息，确认已经分析。
mysql> analyze table city_temp; +-----------------+---------+----------+----------+ | Table | Op | Msg_type | Msg_text | +-----------------+---------+----------+----------+ | world.city_temp | analyze | status | OK | +-----------------+---------+----------+----------+ 1 row in set (0.07 sec)
标签：统计信息 warnings class mat inno dex com and record
原文地址：http://www.cnblogs.com/tomatoes-/p/6031610.html
