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(jì)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(jì)每個(gè)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(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(jì)mysql data目錄中的大小（注意只有庫，不包含數(shù)據(jù)庫日志大小）
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(jì)算結(jié)果追加單位 “MB”
到此這篇關(guān)于Mysql 查詢數(shù)據(jù)庫容量大小的方法步驟的文章就介紹到這了,更多相關(guān)Mysql 查詢數(shù)據(jù)庫容量大小內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！
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