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
SELECT SUM(AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)/1024/1024 AS total_mb FROM information_schema.TABLES
統計每個庫大小:
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
select table_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.tables group by table_schema order by sum(data_length) desc, sum(index_length) desc;
2.查看所有數據庫各表容量大小
select table_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.tables order 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 select table_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.tables where 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 select table_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.tables where 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,不包含數據庫日誌大小)
備註 :
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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