查詢所有數據庫的總大小
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)
統計一下所有庫數據量
每張表數據量=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
統計每個庫大小：
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：查看指定數據庫的大小，比如說：數據庫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.查看所有數據庫各容量大小
select
table_schema as '數據庫',
sum(table_rows) as '記錄數',
sum(truncate(data_length/1024/1024, 2)) as '數據容量(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.查看所有數據庫各表容量大小
select
table_schema as '數據庫',
table_name as '表名',
table_rows as '記錄數',
truncate(data_length/1024/1024, 2) as '數據容量(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.查看指定數據庫容量大小
例：查看mysql庫容量大小
select
table_schema as '數據庫',
sum(table_rows) as '記錄數',
sum(truncate(data_length/1024/1024, 2)) as '數據容量(MB)',
sum(truncate(index_length/1024/1024, 2)) as '索引容量(MB)'
from information_schema.tables
where table_schema='mysql';
4.查看指定數據庫各表容量大小
例：查看mysql庫各表容量大小
select
table_schema as '數據庫',
table_name as '表名',
table_rows as '記錄數',
truncate(data_length/1024/1024, 2) as '數據容量(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命令統計mysql data目錄中的大小（注意只有庫，不包含數據庫日志大小）
備注 ：
data_length ：存儲數據大小
data_length/1024/1024：將字節轉換為MB
round(sum(data_length/1024/1024),2)：取兩位小數
concat(round(sum(data_length/1024/1024),2),'MB') ：給計算結果追加單位 “MB”
到此這篇關于Mysql 查詢數據庫容量大小的方法步驟的文章就介紹到這了,更多相關Mysql 查詢數據庫容量大小內容請搜索腳本之家以前的文章或繼續瀏覽下面的相關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如何查詢日期與時間
- MySQL數據庫高級查詢和多表查詢
- 淺談mysql通配符進行模糊查詢的實現方法
- 淺談MySQL使用笛卡爾積原理進行多表查詢
- MySQL中SQL分頁查詢的幾種實現方法及優缺點
- 一篇文章掌握MySQL的索引查詢優化技巧
- python pymysql鏈接數據庫查詢結果轉為Dataframe實例
- 淺談pymysql查詢語句中帶有in時傳遞參數的問題
- MySQL 多表關聯一對多查詢實現取最新一條數據的方法示例
- MySQL查詢語法匯總
