MySQL查看數據庫、表的佔用空間大小

•查看各庫的大小

代碼以下	複製代碼
SELECT SUM(DATA_LENGTH)+SUM(INDEX_LENGTH) FROM information_schema.tables WHERE TABLE_SCHEMA='database_name';

結果是以字節爲單位，除1024爲K，除1048576爲M。

•查看各表的大小

代碼以下	複製代碼
SELECT TABLE_NAME,DATA_LENGTH+INDEX_LENGTH,TABLE_ROWS FROM information_schema.tables WHERE TABLE_SCHEMA='database_name' AND TABLE_NAME='table_name';

•查看錶的最後修改時間

代碼以下	複製代碼
sELECT TABLE_NAME,UPDATE_TIME FROM information_schema.tables where TABLE_SCHEMA='database_name';  LOG

information_schema 庫的 TABLES 表，主要字段分別是：

TABLE_SCHEMA : 數據庫名
TABLE_NAME：表名
ENGINE：所使用的存儲引擎
TABLES_ROWS：記錄數
DATA_LENGTH：數據大小
INDEX_LENGTH：索引大小

本身應用的一個實例

代碼以下

複製代碼

//先進去MySQL自帶管理庫：information_schema  //本身的數據庫：dbwww58com_kuchecarlib  //本身的表：t_carmodelparamvalue mysql> use information_schema; Database changed mysql> select data_length,index_length     -> from tables where     -> table_schema='dbwww58com_kuchecarlib'     -> and table_name = 't_carmodelparamvalue'; +-------------+--------------+ | data_length | index_length | +-------------+--------------+ |   166379520 |    235782144 | +-------------+--------------+ 1 row in set (0.02 sec) mysql> select concat(round(sum(data_length/1024/1024),2),'MB') as data_length_MB,     -> concat(round(sum(index_length/1024/1024),2),'MB') as index_length_MB     -> from tables where     -> table_schema='dbwww58com_kuchecarlib'     -> and table_name = 't_carmodelparamvalue'; +----------------+-----------------+ | data_length_MB | index_length_MB | +----------------+-----------------+ | 158.67MB       | 224.86MB        | +----------------+-----------------+ 1 row in set (0.03 sec)