mycat1.6.5分片规则（热数据）

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mycat one群：106088787。

分片规则：字符串拆分hash

一、conf/schema.xml文件

<mycat:schema xmlns:mycat="http://io.mycat/">
	<schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100">
		<table name="partition_by_hotdate" primaryKey="id" dataNode="dn$0-2"
			   rule="sharding-by-date" />
	</schema>
	<dataNode name="dn0" dataHost="dh-1" database="db0"/>
	<dataNode name="dn1" dataHost="dh-1" database="db1"/>
	<dataNode name="dn2" dataHost="dh-1" database="db2"/>

	<dataHost name="dh-1" maxCon="1000" minCon="10" balance="0"
			  writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
		<heartbeat>select user()</heartbeat>
		<writeHost host="hostM1" url="localhost:3306" user="root"
				   password="123456">
		</writeHost>
	</dataHost>
</mycat:schema>

二、 conf/rule.xml文件

<tableRule name="sharding-by-date">
		<rule>
		<columns>create_time</columns>
		<algorithm>sharding-by-hotdate</algorithm>
	</rule>
	</tableRule>
	<function name="sharding-by-hotdate" class="io.mycat.route.function.PartitionByHotDate">
		<property name="dateFormat">yyyy-MM-dd</property>
		<property name="sLastDay">10</property>
		<property name="sPartionDay">30</property>
	</function>

三、规则文件信息

无

四、测试用到的sql

=============按照 热数据分片================
CREATE TABLE  partition_by_hotdate  (create_time   timestamp NULL ON UPDATE CURRENT_TIMESTAMP  ,`db_nm`  varchar(20) NULL);
INSERT INTO partition_by_hotdate (create_time,db_nm) VALUES ('2017-10-01', database());
INSERT INTO partition_by_hotdate (create_time,db_nm) VALUES ('2017-10-10', database());
INSERT INTO partition_by_hotdate (create_time,db_nm) VALUES ('2017-10-11', database());
INSERT INTO partition_by_hotdate (create_time,db_nm) VALUES ('2017-10-21', database());
INSERT INTO partition_by_hotdate (create_time,db_nm) VALUES ('2017-10-31', database());
INSERT INTO partition_by_hotdate (create_time,db_nm) VALUES ('2017-11-30', database());
select * from partition_by_hotdate;

五、注意事项

1、数据的及时移动

六、参数说明

1、dataFormat：时间格式化

2、sLastDay:热数据的天数

3、sPartionDay:冷数据的分片天数（按照天数分片）