MySQL的數(shù)據(jù)表狀態(tài)記錄表是一個(gè)非常重要的系統(tǒng)表,它主要用于記錄MySQL數(shù)據(jù)庫中的所有數(shù)據(jù)表的狀態(tài)信息。這個(gè)表可以在MySQL中創(chuàng)建,但是由于它的特殊作用,通常只有系統(tǒng)管理員或開發(fā)人員才能夠訪問和使用。
MySQL的數(shù)據(jù)表狀態(tài)記錄表中包含了非常豐富的信息,比如數(shù)據(jù)表的名稱、引擎類型、數(shù)據(jù)量、碎片數(shù)量、索引數(shù)量、空間占用率等等,這些信息對(duì)于數(shù)據(jù)庫的管理以及性能優(yōu)化都非常有幫助。
mysql>SHOW TABLE STATUS; +----------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+-------------------+----------+----------------+---------+ | Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment | +----------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+-------------------+----------+----------------+---------+ | user_department| InnoDB | 10 | Compact | 2 | 25 | 50 | 0 | 32768 | 7340032 | 1 | 2021-12-09 16:53:38 | NULL | NULL | utf8_general_ci | NULL | | | | user_info | InnoDB | 10 | Compact | 1 | 25 | 25 | 0 | 32768 | 7340032 | 1 | 2021-12-09 16:59:58 | NULL | NULL | utf8_general_ci | NULL | | | | user_project | InnoDB | 10 | Compact | 2 | 25 | 50 | 0 | 32768 | 7340032 | 1 | 2021-12-09 17:00:45 | NULL | NULL | utf8_general_ci | NULL | | | +----------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+-------------------+----------+----------------+---------+
上面是一個(gè)簡單的示例,在MySQL執(zhí)行SHOW TABLE STATUS命令時(shí),返回了所有數(shù)據(jù)表的狀態(tài)信息,這些信息可以幫助我們更好地管理MySQL中的數(shù)據(jù)表。