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Mysql 查詢數(shù)據(jù)庫容量大小的方法步驟

更新時間：2020年06月09日 11:08:50 作者：Jevic

這篇文章主要介紹了Mysql 查詢數(shù)據(jù)庫容量大小的方法步驟，文中通過示例代碼介紹的非常詳細(xì)，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

查詢所有數(shù)據(jù)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(tǒng)計一下所有庫數(shù)據(jù)量

每張表數(shù)據(jù)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(tǒng)計每個庫大?。?br />

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(shù)據(jù)庫的大小，比如說：數(shù)據(jù)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(shù)據(jù)庫各容量大小

select
table_schema as '數(shù)據(jù)庫',
sum(table_rows) as '記錄數(shù)',
sum(truncate(data_length/1024/1024, 2)) as '數(shù)據(jù)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(shù)據(jù)庫各表容量大小

select
table_schema as '數(shù)據(jù)庫',
table_name as '表名',
table_rows as '記錄數(shù)',
truncate(data_length/1024/1024, 2) as '數(shù)據(jù)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(shù)據(jù)庫容量大小

例：查看mysql庫容量大小
select
table_schema as '數(shù)據(jù)庫',
sum(table_rows) as '記錄數(shù)',
sum(truncate(data_length/1024/1024, 2)) as '數(shù)據(jù)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(shù)據(jù)庫各表容量大小

例：查看mysql庫各表容量大小

select
table_schema as '數(shù)據(jù)庫',
table_name as '表名',
table_rows as '記錄數(shù)',
truncate(data_length/1024/1024, 2) as '數(shù)據(jù)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(tǒng)計mysql data目錄中的大?。ㄗ⒁庵挥袔欤话瑪?shù)據(jù)庫日志大?。?/p>

備注：

data_length ：存儲數(shù)據(jù)大小

data_length/1024/1024：將字節(jié)轉(zhuǎn)換為MB

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

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

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