查看mysql数据库容量大小
第一种情况：
查询所有数据库的总大小
，方法如下：
mysql> use information_schema;
mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),"MB") as data from TABLES;
+-----------+
| data |
+-----------+
| 3052.76MB |
+-----------+
1 row in set (0.02 sec)
统计一下所有库数据量
每张表数据量=AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH
SELECT
SUM(AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)/1024/1024 AS total_mb
FROM information_schema.TABLES
统计每个库大小：
SELECT
table_schema,SUM(AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)/1024/1024 AS total_mb
FROM information_schema.TABLES group by table_schema;
第二种情况：
查看指定数据库的大小
，比如说：数据库test，方法如下：
mysql> use information_schema;
mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),"MB") as data from TABLES where table_schema="
test
";
+----------+
| data |
+----------+
| 142.84MB |
+----------+
1 row in set (0.00 sec)
1.查看所有数据库各容量大小
select
table_schema as "数据库",
sum(table_rows) as "记录数",
sum(truncate(data_length/1024/1024, 2)) as "数据容量(MB)",
sum(truncate(index_length/1024/1024, 2)) as "索引容量(MB)"
from information_schema.tables
group by table_schema
order by sum(data_length) desc, sum(index_length) desc;
2.查看所有数据库各表容量大小
select
table_schema as "数据库",
table_name as "表名",
table_rows as "记录数",
truncate(data_length/1024/1024, 2) as "数据容量(MB)",
truncate(index_length/1024/1024, 2) as "索引容量(MB)"
from information_schema.tables
order by data_length desc, index_length desc;
3.查看指定数据库容量大小
例：查看mysql库容量大小
select
table_schema as "数据库",
sum(table_rows) as "记录数",
sum(truncate(data_length/1024/1024, 2)) as "数据容量(MB)",
sum(truncate(index_length/1024/1024, 2)) as "索引容量(MB)"
from information_schema.tables
where table_schema="mysql";
4.查看指定数据库各表容量大小
例：查看mysql库各表容量大小
select
table_schema as "数据库",
table_name as "表名",
table_rows as "记录数",
truncate(data_length/1024/1024, 2) as "数据容量(MB)",
truncate(index_length/1024/1024, 2) as "索引容量(MB)"
from information_schema.tables
where table_schema="mysql"
order by data_length desc, index_length desc;
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