查詢所有數據庫的總大小

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)

統計一下所有庫數據量

每張表數據量=AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH

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

統計每個庫大?。?/p>

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

第二種情況：查看指定數據庫的大小，比如說：數據庫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.查看所有數據庫各容量大小

selecttable_schema as ’數據庫’,sum(table_rows) as ’記錄數’,sum(truncate(data_length/1024/1024, 2)) as ’數據容量(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;

2.查看所有數據庫各表容量大小

selecttable_schema as ’數據庫’,table_name as ’表名’,table_rows as ’記錄數’,truncate(data_length/1024/1024, 2) as ’數據容量(MB)’,truncate(index_length/1024/1024, 2) as ’索引容量(MB)’from information_schema.tablesorder by data_length desc, index_length desc;

3.查看指定數據庫容量大小

例：查看mysql庫容量大小selecttable_schema as ’數據庫’,sum(table_rows) as ’記錄數’,sum(truncate(data_length/1024/1024, 2)) as ’數據容量(MB)’,sum(truncate(index_length/1024/1024, 2)) as ’索引容量(MB)’from information_schema.tableswhere table_schema=’mysql’;　

4.查看指定數據庫各表容量大小

例：查看mysql庫各表容量大小selecttable_schema as ’數據庫’,table_name as ’表名’,table_rows as ’記錄數’,truncate(data_length/1024/1024, 2) as ’數據容量(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;

題外方法

直接用shell命令統計mysql data目錄中的大小（注意只有庫，不包含數據庫日志大小）

備注 ：

data_length ：存儲數據大小

data_length/1024/1024：將字節轉換為MB

round(sum(data_length/1024/1024),2)：取兩位小數

concat(round(sum(data_length/1024/1024),2),’MB’) ：給計算結果追加單位 “MB”

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