MyCat 学习笔记 第十三篇.数据分片 之 通过HINT执行存储过程

1 环境说明

VM 模拟3台MYSQL 5.6 服务器

   VM1 192.168.31.187:3307

   VM2 192.168.31.212:3307

   VM3 192.168.31.150:  3307

 

MYCAT 1.5 服务部署在宿主机上

  MYCAT 192.168.31.207 :8806【SQL执行端口】 / 9066【管理端口】

 

2 应用场景

2.0 MYCAT配置

schema.xml

<schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100">
  <table name="t_demo_travel_record" dataNode="dn1,dn2,dn3" rule="auto-sharding-long" />
  <table name="t_demo_travel_record_child" dataNode="dn1,dn2,dn3" rule="auto-sharding-long" />
</schema>

<dataNode name="dn1" dataHost="vm1" database="test" />
<dataNode name="dn2" dataHost="vm2" database="test" />
<dataNode name="dn3" dataHost="vm3" database="test" />

<dataHost name="vm1" maxCon="1000" minCon="10" balance="0"
  writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
  <heartbeat>select user()</heartbeat>
  <writeHost host="vm1M1" url="192.168.31.187:3307" user="root" password="root123"></writeHost>
</dataHost>

<dataHost name="vm2" maxCon="1000" minCon="10" balance="0"
  writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
  <heartbeat>select user()</heartbeat>
  <writeHost host="vm2M1" url="192.168.31.212:3307" user="root" password="root123"></writeHost>

</dataHost>

<dataHost name="vm3" maxCon="1000" minCon="10" balance="0"
  writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
  <heartbeat>select user()</heartbeat>
  <writeHost host="vm3M1" url="192.168.31.150:3307" user="root" password="root123"></writeHost>

</dataHost>

 

rule.xml

 

<tableRule name="auto-sharding-long">
  <rule>
    <columns>id</columns>
    <algorithm>rang-long</algorithm>
  </rule>
</tableRule>

 

<function name="rang-long"
  class="org.opencloudb.route.function.AutoPartitionByLong">
  <property name="mapFile">autopartition-long.txt</property>
  <property name="defaultNode">0</property>
</function>

 

autopartition-long.txt

# range start-end ,data node index
# K=1000,M=10000.
0-500M=0
500M-1000M=1
1000M-1500M=2

 

2.1 hint

第一次知道并使用 hint 是在用oracle数据库调优的时候。

08年的时候,看到生产环境程序的SQL语句有 /* xxxx */ select xxx from table ,当初不知道何为hint,就一把删了。结果被 TPM 批了一顿~~~

MYCAT 中也可以hint ,这里主要讲一下如何通过 hint 指定物理数据库执行存储过程。

 

2.2 Mysql 存储过程 ,传参形式没有验证成功,不知道是否是mycat这个版本目前还不支持

DELIMITER ;

DROP PROCEDURE `test`.`p_travel_recrod_sum`;

DELIMITER //
CREATE PROCEDURE `p_travel_recrod_sum` ()
BEGIN

declare m_id_sum varchar(45);

select sum(id) into m_id_sum from t_demo_travel_record ;

update t_demo_travel_record t set t.context = t.context + m_id_sum ;

END //

DELIMITER ;

grant execute on procedure p_travel_recrod_sum to 'root'@'%';

flush privileges;

 

2.3 MYCAT 通过 hint 执行存储过程,根据分片规则ID=1的数据应该是在DN1结点上执行 p_travel_record_sum()

mysql> DELIMITER //

mysql> /*!mycat:sql=select * from t_demo_travel_record where id = 1;*/ call p_travel_recrod_sum() //

Query OK, 748003 rows affected, 64 warnings (9.57 sec)

 

查看下物理库的情况 DN1结点

mysql> select * from t_demo_travel_record limit 100,10;

+-------+---------------+

| id    | context       |

+-------+---------------+

| 10099 | 1870567757749 |

| 10100 | 1870567757749 |

| 10101 | 1870567757749 |

| 10102 | 1870567757749 |

| 10103 | 1870567757749 |

| 10104 | 1870567757749 |

| 10105 | 1870567757749 |

| 10106 | 1870567757749 |

| 10107 | 1870567757749 |

| 10108 | 1870567757749 |

+-------+---------------+

10 rows in set (0.00 sec)

 

DN2结点

mysql>  select * from t_demo_travel_record limit 100,10;

+---------+-----------------+

| id      | context         |

+---------+-----------------+

| 5000101 | context_5000101 |

| 5000102 | context_5000102 |

| 5000103 | context_5000103 |

| 5000104 | context_5000104 |

| 5000105 | context_5000105 |

| 5000106 | context_5000106 |

| 5000107 | context_5000107 |

| 5000108 | context_5000108 |

| 5000109 | context_5000109 |

| 5000110 | context_5000110 |

+---------+-----------------+

10 rows in set (0.00 sec)

 

 

到此为止,通过 hint 执行 指定数据库 procedure 验证完成。

 

 

 

posted @ 2016-02-03 02:16  kaye0110  阅读(2365)  评论(0编辑  收藏  举报