前言在mysql中有乙個預設的資料表information_schema，information_schema這張資料表儲存了mysql伺服器所有資料庫的資訊。如資料庫名，資料庫的表，表欄的資料型別與訪問許可權等。
再簡單點，這台mysql伺服器上，到底有哪些資料庫、各個資料庫有哪些表，每張表的字段型別是什麼，各個資料庫要什麼許可權才能訪問，等等資訊都儲存在information_schema表裡面，所以請勿刪改此表。
**1，切換資料庫
use information_schema;
2，檢視資料庫使用大小
select concat(round(sum(data_length/1024/1024),2),』mb』) as data from tables wheretable_schema=』db_name』 ;
3，檢視表使用大小
select concat(round(sum(data_length/1024/1024),2),』mb』) as data from tables wheretable_schema=』db_name』 andtable_name=』table_name』;
網上找的乙個，親測可用:
先進去mysql自帶管理庫：information_schema
然後查詢 data_length,index_length
你自己的資料庫名：dbname
你自己的表名：tablename
mysql>use information_schema;
database changed
mysql>select data_length,index_length
->from tables where
->table_schema='dbname'
->andtable_name='tablename';
| data_length | index_length |
| 166379520 | 235782144 |
row in set (0.02 sec)
mysql>select concat(round(sum(data_length/1024/1024),2),'mb') as data_length_mb,
->concat(round(sum(index_length/1024/1024),2),'mb') as index_length_mb
->from tables where
->table_schema='dbname'
->andtable_name='tablename';
| data_length_mb | index_length_mb |
| 158.67mb | 224.86mb |
row in set (0.03 sec)
1.檢視所有資料庫容量大小
select
table_schema as '資料庫',
sum(table_rows) as '記錄數',
sum(truncate(data_length/1024/1024, 2)) as '資料容量(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.檢視所有資料庫各表容量大小
```sql
select
table_schema as '資料庫',
table_name as '表名',
table_rows as '記錄數',
truncate(data_length/1024/1024, 2) as '資料容量(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.檢視指定資料庫容量大小
例：檢視mysql庫容量大小
select
table_schema as '資料庫',
sum(table_rows) as '記錄數',
sum(truncate(data_length/1024/1024, 2)) as '資料容量(mb)',
sum(truncate(index_length/1024/1024, 2)) as '索引容量(mb)'
from information_schema.tables
where table_schema='mysql';
4.檢視指定資料庫各表容量大小
例：檢視mysql庫各表容量大小
select
table_schema as '資料庫',
table_name as '表名',
table_rows as '記錄數',
truncate(data_length/1024/1024, 2) as '資料容量(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;
select concat(round(sum(data_length/1024/1024),2),'mb') as data_length_mb, concat(round(sum(index_length/1024/1024),2),'mb') as index_length_mb
from tables
where table_schema='passport'andtable_name='tb_user_info';
-- 569.98mb 141.98mb
select concat(round(sum(data_length/1024/1024),2),'mb') as data_length_mb, concat(round(sum(index_length/1024/1024),2),'mb') as index_length_mb
from tables
where table_schema='passport_v2'andtable_name='tb_user_info';
-- 2128.94mb 285.00mb
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