查看mysql数据库容量大小

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 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zabbix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=\'zabbix\'; 
 
4.查看指定数据库各表容量大小
例:查看zabbix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=\'zabbix\'
order by data_length desc, index_length desc;
 
转载于https://www.cnblogs.com/--smile/p/11451238.html

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