查詢所有數(shù)據(jù)庫(kù)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(kù)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(kù)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(kù)的大小，比如說(shuō)：數(shù)據(jù)庫(kù)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(kù)各容量大小
select
table_schema as '數(shù)據(jù)庫(kù)',
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(kù)各表容量大小
select
table_schema as '數(shù)據(jù)庫(kù)',
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(kù)容量大小
例：查看mysql庫(kù)容量大小
select
table_schema as '數(shù)據(jù)庫(kù)',
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(kù)各表容量大小
例：查看mysql庫(kù)各表容量大小
select
table_schema as '數(shù)據(jù)庫(kù)',
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?。ㄗ⒁庵挥袔?kù)，不包含數(shù)據(jù)庫(kù)日志大?。?/p>
備注 ：
data_length ：存儲(chǔ)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(kù)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(kù)容量大小內(nèi)容請(qǐng)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！
您可能感興趣的文章:- mysql如何查詢?nèi)掌谂c時(shí)間
- MySQL數(shù)據(jù)庫(kù)高級(jí)查詢和多表查詢
- 淺談mysql通配符進(jìn)行模糊查詢的實(shí)現(xiàn)方法
- 淺談MySQL使用笛卡爾積原理進(jìn)行多表查詢
- MySQL中SQL分頁(yè)查詢的幾種實(shí)現(xiàn)方法及優(yōu)缺點(diǎn)
- 一篇文章掌握MySQL的索引查詢優(yōu)化技巧
- python pymysql鏈接數(shù)據(jù)庫(kù)查詢結(jié)果轉(zhuǎn)為Dataframe實(shí)例
- 淺談pymysql查詢語(yǔ)句中帶有in時(shí)傳遞參數(shù)的問(wèn)題
- MySQL 多表關(guān)聯(lián)一對(duì)多查詢實(shí)現(xiàn)取最新一條數(shù)據(jù)的方法示例
- MySQL查詢語(yǔ)法匯總
