查看mysql库大小，表大小，索引大小
说明：
通过MySQL的 information_schema 数据库，可查询数据库中每个表占用的空间、表记录的行数；该库中有一个 TABLES 表，这个表主要字段分别是：
TABLE_SCHEMA : 数据库名
TABLE_NAME：表名
ENGINE：所使用的存储引擎
TABLES_ROWS：记录数
DATA_LENGTH：数据大小
INDEX_LENGTH：索引大小
其他字段请参考MySQL的手册，查看一个表占用空间的大小，那就相当于是 数据大小 + 索引大小 。
查看所有库的大小
select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES;
+----------+
| data |
+----------+
| 104.21MB |
+----------+
1 row in set (0.11 sec)
查看指定库的大小
select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES where table_schema='jishi';
+---------+
| data |
+---------+
| 26.17MB |
+---------+
1 row in set (0.01 sec)</pre>
查看指定库的指定表的大小
select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES where table_schema='jishi' and table_name='a_ya';
+--------+
| data |
+--------+
| 0.02MB |
+--------+
1 row in set (0.00 sec)
查看指定库的索引大小
SELECT CONCAT(ROUND(SUM(index_length)/(1024*1024), 2), ' MB') AS 'Total Index Size' FROM TABLES WHERE table_schema = 'jishi';
+------------------+
| Total Index Size |
+------------------+
| 0.94 MB |
+------------------+
1 row in set (0.01 sec)
查看指定库的指定表的索引大小
SELECT CONCAT(ROUND(SUM(index_length)/(1024*1024), 2), ' MB') AS 'Total Index Size' FROM TABLES WHERE table_schema = 'test' and table_name='a_yuser';
+------------------+
| Total Index Size |
+------------------+
| 21.84 MB |
+------------------+
1 row in set (0.00 sec)
show create table test.a_yuser
*************************** 1. row ***************************
Table: a_yuser Create Table: CREATE TABLE `a_yuser` (
`email` varchar(60) NOT NULL DEFAULT '',
`user_name` varchar(60) NOT NULL DEFAULT '', KEY `cc` (`email`(5)), KEY `ccb` (`user_name`(5)), KEY `ccbc` (`email`(5),`user_name`(5))
) ENGINE=MyISAM DEFAULT CHARSET=utf8
1 row in set (0.00 sec)
ERROR:
No query specified
mysql> select count(*) from test.a_yuser;
+----------+
| count(*) |
+----------+
| 1073607 |
+----------+
1 row in set (0.00 sec)
查看一个库中的情况
SELECT CONCAT(table_schema,'.',table_name) AS 'Table Name', CONCAT(ROUND(table_rows/1000000,4),'M') AS 'Number of Rows', CONCAT(ROUND(data_length/(1024*1024*1024),4),'G') AS 'Data Size', CONCAT(ROUND(index_length/(1024*1024*1024),4),'G') AS 'Index Size', CONCAT(ROUND((data_length+index_length)/(1024*1024*1024),4),'G') AS'Total'FROM information_schema.TABLES WHERE table_schema LIKE 'test';
+---------------+----------------+-----------+------------+---------+
| Table Name | Number of Rows | Data Size | Index Size | Total |
+---------------+----------------+-----------+------------+---------+
| test.a_br | 0.4625M | 0.0259G | 0.0171G | 0.0431G |
| test.a_skuclr | 0.7099M | 0.0660G | 0.0259G | 0.0919G |
| test.a_yuser | 1.0736M | 0.0497G | 0.0213G | 0.0710G |
| test.test | 0.0000M | 0.0000G | 0.0000G | 0.0000G |
+---------------+----------------+-----------+------------+---------+
4 rows in set (0.13 sec)
