如何確定特定MySQL表佔用了多少磁盤空間？

Question

有沒有一種快速確定特定MySQL表佔用多少磁盤空間的方法？該表可能是MyISAM或Innodb。

Answer 1

對於表mydb.mytable運行本作：

BYTES

SELECT (data_length+index_length) tablesize 
FROM information_schema.tables 
WHERE table_schema='mydb' and table_name='mytable'; 

KILOBYTES

SELECT (data_length+index_length)/power(1024,1) tablesize_kb 
FROM information_schema.tables 
WHERE table_schema='mydb' and table_name='mytable'; 

MEGABYTES

SELECT (data_length+index_length)/power(1024,2) tablesize_mb 
FROM information_schema.tables 
WHERE table_schema='mydb' and table_name='mytable'; 

GIGABYTES

SELECT (data_length+index_length)/power(1024,3) tablesize_gb 
FROM information_schema.tables 
WHERE table_schema='mydb' and table_name='mytable'; 

GENERIC

下面是一個通用查詢，其中最大單元顯示爲TB（兆兆字節）

SELECT 
    CONCAT(FORMAT(DAT/POWER(1024,pw1),2),' ',SUBSTR(units,pw1*2+1,2)) DATSIZE, 
    CONCAT(FORMAT(NDX/POWER(1024,pw2),2),' ',SUBSTR(units,pw2*2+1,2)) NDXSIZE, 
    CONCAT(FORMAT(TBL/POWER(1024,pw3),2),' ',SUBSTR(units,pw3*2+1,2)) TBLSIZE 
FROM 
(
    SELECT DAT,NDX,TBL,IF(px>4,4,px) pw1,IF(py>4,4,py) pw2,IF(pz>4,4,pz) pw3 
    FROM 
    (
     SELECT data_length DAT,index_length NDX,data_length+index_length TBL, 
     FLOOR(LOG(IF(data_length=0,1,data_length))/LOG(1024)) px, 
     FLOOR(LOG(IF(index_length=0,1,index_length))/LOG(1024)) py, 
     FLOOR(LOG(IF(data_length+index_length=0,1,data_length+index_length))/LOG(1024)) pz 
     FROM information_schema.tables 
     WHERE table_schema='mydb' 
     AND table_name='mytable' 
    ) AA 
) A,(SELECT 'B KBMBGBTB' units) B; 

試試看!!!

Answer 2

從How do I check how much disk space my database is using?

兩者您可以通過點擊數據庫名稱在左框架 和讀取尺寸表中那裏看着phpMyAdmin在 您的控制面板檢查MySQL表的大小正確的框架。

下面的查詢會也有助於得到bytes

select SUM(data_length) + SUM(index_length) as total_size 
from information_schema.tables 
where table_schema = 'db_name' 
and table_name='table_name'; 

Answer 3

也許你可以看看文件的大小相同的信息...

每個表存儲在幾個單獨的文件在命名爲您所謂的數據庫的文件夾內。這些文件夾存儲在mysql數據目錄中。

從那裏你可以做一個'du -sh。*'來獲得磁盤上表的大小。

Answer 4

在Linux中默認安裝的MySQL：

[you@yourbox]$ ls -lha /var/lib/mysql/<databasename> 

基於NIXCRAFT's mysql db location

Answer 5

這會不會是準確的InnoDB表。磁盤上的大小實際上大於通過查詢報告的大小。

請參閱此鏈接從Percona獲取更多信息。

http://www.mysqlperformanceblog.com/2008/12/16/how-much-space-does-empty-innodb-table-take/

Answer 6

基礎上RolandMySQLDBA的答案，我想我們可以用上面得到每個模式的尺寸表：

SELECT table_schema, SUM((data_length+index_length)/power(1024,1)) tablesize_kb 
    FROM information_schema.tables GROUP BY table_schema; 

真的很喜歡它！

Answer 7

我只想用「mysqldiskusage」工具，遵循SQL的

$ mysqldiskusage --server=user:password@localhost mydbname 
# Source on localhost: ... connected. 

# Database totals: 
+------------+----------------+ 
| db_name |   total | 
+------------+----------------+ 
| mydbaname | 5,403,033,600 | 
+------------+----------------+ 

Total database disk usage = 5,403,033,600 bytes or 5.03 GB 

Answer 8

快一點，以獲得以MB爲排名前20位最大的表。

SELECT table_schema, table_name, 
    ROUND((data_length+index_length)/POWER(1024,2),2) AS tablesize_mb 
FROM information_schema.tables 
ORDER BY tablesize_mb DESC LIMIT 20; 

希望對某人有用！