Mysql 查询数据库容量大小的方法步骤

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)

每张表数据量=AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH

SELECTSUM(AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)/1024/1024 AS total_mbFROM information_schema.TABLES

SELECTtable_schema,SUM(AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)/1024/1024 AS total_mbFROM information_schema.TABLES group by table_schema;

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)

selecttable_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.tablesgroup by table_schemaorder by sum(data_length) desc, sum(index_length) desc;

selecttable_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.tablesorder by data_length desc, index_length desc;

例：查看mysql库容量大小selecttable_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.tableswhere table_schema='mysql';

例：查看mysql库各表容量大小selecttable_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.tableswhere table_schema='mysql'order by data_length desc, index_length desc;

直接用shell命令统计mysql data目录中的大小（注意只有库，不包含数据库日志大小）

备注：

data_length ：存储数据大小

data_length/1024/1024：将字节转换为MB

round(sum(data_length/1024/1024),2)：取两位小数

concat(round(sum(data_length/1024/1024),2),'MB') ：给计算结果追加单位 “MB”

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