快速体验MyCAT

D:\mycat\bin>mysql -utest -ptest -P9066 -Dtestdb
		mysql> show @@help;      -- 获取有关管理的相关命令
		mysql> show @@database;  -- 查看逻辑数据库
		+----------+
		| DATABASE |
		+----------+
		| testdb   |
		+----------+


mysql> show @@datanode;  --查看分片节点
+------+-------------------+-------+-------+--------+------+------+---------+------------+----------+---------+---------------+
| NAME | DATHOST           | INDEX | TYPE  | ACTIVE | IDLE | SIZE | EXECUTE | TOTAL_TIME | MAX_TIME | MAX_SQL | RECOVERY_TIME |
+------+-------------------+-------+-------+--------+------+------+---------+------------+----------+---------+---------------+
| dn1  | 192.168.1.204/db1 |     0 | mysql |      0 |   10 | 1000 |     152 |          0 |        0 |       0 |            -1 |
| dn2  | 192.168.1.143/db2 |     0 | mysql |      0 |    0 | 1000 |       0 |          0 |        0 |       0 |            -1 |
+------+-------------------+-------+-------+--------+------+------+---------+------------+----------+---------+---------------+


	mysql> show @@server;   --查看服务器状态
	+---------------+-------------+--------------+------------+---------------+---------------+---------+--------+-----------------------+
	| UPTIME        | USED_MEMORY | TOTAL_MEMORY | MAX_MEMORY | RELOAD_TIME   | ROLLBACK_TIME | CHARSET | STATUS | AVG_BUFPOOL_ITEM_SIZE |
	+---------------+-------------+--------------+------------+---------------+---------------+---------+--------+-----------------------+
	| 23m 50s 344ms |   344386624 |   2058878976 | 2058878976 | 1443150953033 |            -1 | gbk     | ON     |                  1878 |
	+---------------+-------------+--------------+------------+---------------+---------------+---------+--------+-----------------------+


		mysql> show @@version;  --查看版本
		+----------------------------------------+
		| VERSION                                |
		+----------------------------------------+
		| 5.5.8-mycat-1.4-RELEASE-20150922233010 |
		+----------------------------------------+


		--基于数据端口演示，分别创建连接用户及数据库
		(root@192.168.1.204) [(none)]> grant all privileges on *.* to ‘mycat‘@‘192.168.%.%‘ identified by ‘pwd‘;
		Query OK, 0 rows affected (0.00 sec)


		(root@192.168.1.204) [(none)]> create database db1;
		Query OK, 1 row affected (0.00 sec)
		
		(root@192.168.1.143) [(none)]> grant all privileges on *.* to ‘mycat‘@‘192.168.%.%‘ identified by ‘pwd‘;
		Query OK, 0 rows affected (0.00 sec)
		
		(root@192.168.1.143) [(none)]> create database db2;
		D:\mycat\bin>mysql -utest -ptest -P8066 -Dtestdb


		D:\mycat\bin>mysql -utest -ptest -P8066 -Dtestdb
		mysql> select database();
		+------------+
		| DATABASE() |
		+------------+
		| testdb     |
		+------------+


		mysql> show tables;
		+------------------+
		| Tables in testdb |
		+------------------+
		| goods            |
		+------------------+


		mysql> desc goods;
		ERROR 1146 (42S02): Table ‘db2.goods‘ doesn‘t exist


		mysql> explain create table goods(id int auto_increment not null primary key,val varchar(20));
		+-----------+--------------------------------------------------------------------------------+
		| DATA_NODE | SQL                                                                            |
		+-----------+--------------------------------------------------------------------------------+
		| dn1       | create table goods(id int auto_increment not null primary key,val varchar(20)) |
		| dn2       | create table goods(id int auto_increment not null primary key,val varchar(20)) |
		+-----------+--------------------------------------------------------------------------------+


		mysql> create table goods(id int auto_increment not null primary key,val varchar(20));
		Query OK, 0 rows affected (0.05 sec)


		mysql> insert into goods(val) values(‘apple‘);


		mysql> explain select * from goods;
		+-----------+-------------------------------+
		| DATA_NODE | SQL                           |
		+-----------+-------------------------------+
		| dn2       | SELECT * FROM goods LIMIT 100 | --此处可知，select查询会直接查询第二个分片
		+-----------+-------------------------------+
		
		mysql> select ‘Leshami‘ as author,‘http://blog.csdn.net/leshami‘ as Blog;
		+---------+------------------------------+
		| author  | Blog                         |
		+---------+------------------------------+
		| Leshami | http://blog.csdn.net/leshami |
		+---------+------------------------------+


		mysql> select * from goods;
		+----+-------+
		| id | val   |
		+----+-------+
		|  1 | apple |
		+----+-------+


		D:\mycat\bin>mysql -umycat -ppwd -h192.168.1.143 -P3307 -e "select * from db2.goods"
		Warning: Using a password on the command line interface can be insecure.
		+----+-------+
		| id | val   |
		+----+-------+
		|  1 | apple |
		+----+-------+


		D:\mycat\bin>mysql -umycat -ppwd -h192.168.1.204 -P3306 -e "select * from db1.goods"
		Warning: Using a password on the command line interface can be insecure.
		+----+-------+
		| id | val   |
		+----+-------+
		|  1 | apple |
		+----+-------+
		
		D:\mycat\bin>mysql -uuser -puser -P8066 -Dtestdb  --只读用户连接
		mysql> use testdb;
		Database changed
		mysql> show tables;
		+------------------+
		| Tables in testdb |
		+------------------+
		| goods            |
		+------------------+


		mysql> desc goods;
		ERROR 1495 (HY000): User readonly   --提示用户只读

快速体验MyCAT

原文：http://blog.csdn.net/leshami/article/details/48968691