關於Mysql(MariaDB)的基本操作命令指南
阿新 • • 發佈:2018-05-23
MariaDB MysqlMYSQL基本命令操作
1.登錄方法:
mysql -u root -p
2.顯示所有數據庫:
show databases;
3.操作指定數據庫(以information_schema為例)
use information_schema
4.顯示所有的表
show tables;
5.顯示表結構(以users表為例)
discribe tables;
6.查詢所有數據庫的大小:
select concat(round(sum(data_length/1024/1024),2),‘MB‘) as data from tables;
7.查詢指定數據庫的大小(以zabbix為例):
select concat(round(sum(data_length/1024/1024),2),‘MB‘) as data from tables where table_schema=‘zabbix‘;
8.查詢指定數據庫中所有表的大小(以zabbix為例):
SELECT TABLE_NAME,DATA_LENGTH+INDEX_LENGTH,TABLE_ROWS,concat(round((DATA_LENGTH+INDEX_LENGTH)/1024/1024,2), ‘MB‘) as data
FROM information_schema.tables WHERE TABLE_SCHEMA=‘zabbix‘ ORDER BY DATA_LENGTH+INDEX_LENGTH desc;
9.查詢指定數據庫中指定表的大小(以zabbix數據庫的history表為例):
select concat(round(sum(data_length/1024/1024),2),‘MB‘) as data from tables where table_schema=‘zabbix‘ and table_name=‘history‘;``
關於Mysql(MariaDB)的基本操作命令指南