1，按日期（天）分片
按日期（天）分片：从開始日期算起，依照天数来分片
比如，从2016-01-01。每10天一个分片 注意事项：须要提前将分片规划好，建好。否则有可能日期超出实际配置分片数2，加入配置文件
在function.xml里面进行配置：
yyyy-MM-dd 2016-01-01 10 CREATE_TIME sharding-by-date
在schema.xml里面进行配置：
3。建表而且录入数据
CREATE TABLE ORDER0402(ID INT NOT NULL AUTO_INCREMENT PRIMARY KEY,PROVINCE VARCHAR(16),SN VARCHAR(64),CREATE_TIME DATETIME); mysql> CREATE TABLE ORDER0402(ID INT NOT NULL AUTO_INCREMENT PRIMARY KEY,PROVINCE VARCHAR(16),SN VARCHAR(64),CREATE_TIME DATETIME); Query OK, 0 rows affected (0.05 sec) mysql> INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(10001,'shanghai','shanghai10006_2016-01-03','2016-01-03'); INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(5000001,'shanghai','shanghai10006_2016-01-13','2016-01-13'); mysql> CREATE TABLE ORDER0402(ID INT NOT NULL AUTO_INCREMENT PRIMARY KEY,PROVINCE VARCHAR(16),SN VARCHAR(64),CREATE_TIME DATETIME); Query OK, 0 rows affected (0.06 sec) mysql> explain INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(10001,'shanghai','shanghai10006_2016-01-03','2016-01-03'); +-----------+--------------------------------------------------------------------------------------------------------------------+ | DATA_NODE | SQL | +-----------+--------------------------------------------------------------------------------------------------------------------+ | dn21 | INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(10001,'shanghai','shanghai10006_2016-01-03','2016-01-03') | +-----------+--------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.11 sec) mysql> INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(10001,'shanghai','shanghai10006_2016-01-03','2016-01-03'); Query OK, 1 row affected (0.00 sec) mysql> mysql> explain INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(5000001,'shanghai','shanghai10006_2016-01-13','2016-01-13'); +-----------+----------------------------------------------------------------------------------------------------------------------+ | DATA_NODE | SQL | +-----------+----------------------------------------------------------------------------------------------------------------------+ | dn22 | INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(5000001,'shanghai','shanghai10006_2016-01-13','2016-01-13') | +-----------+----------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.01 sec) mysql> INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(5000001,'shanghai','shanghai10006_2016-01-13','2016-01-13'); Query OK, 1 row affected (0.01 sec) mysql>
4，对insert操作流程进行分析，參考mycat.log对路由过程做完整的分析
查看后台mycat.log分析例如以下：
開始获取连接： 02/12 22:23:26.386 DEBUG [$_NIOREACTOR-2-RW] (ServerQueryHandler.java:56) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(5000001,'shanghai','shanghai10006_2016-01-13','2016-01-13')開始路由匹配： 02/12 22:23:26.388 DEBUG [$_NIOREACTOR-2-RW] (NonBlockingSession.java:113) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(5000001,'shanghai','shanghai10006_2016-01-13','2016-01-13'), route={ 1 -> dn22{ INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(5000001,'shanghai','shanghai10006_2016-01-13','2016-01-13')}匹配好路由后，直接往相应的dn22节点開始运行insert数据录入操作： 02/12 22:23:26.403 DEBUG [$_NIOREACTOR-1-RW] (NonBlockingSession.java:229) -release connection MySQLConnection [id=17, lastTime=1455287006372, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=90, charset=latin1, txIsolation=3, autocommit=true, attachment=dn22{ INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(5000001,'shanghai','shanghai10006_2016-01-13','2016-01-13')}, respHandler=SingleNodeHandler [node=dn22{ INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(5000001,'shanghai','shanghai10006_2016-01-13','2016-01-13')}, packetId=0], host=13.23.1.11, port=3327, statusSync=null, writeQueue=0, modifiedSQLExecuted=true]操作完毕，開始释放连接： 02/12 22:23:26.404 DEBUG [$_NIOREACTOR-1-RW] (PhysicalDatasource.java:403) -release channel MySQLConnection [id=17, lastTime=1455287006372, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=90, charset=latin1, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=13.23.1.11, port=3327, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] 5，运行简单的查询，假设指定分片字段ID字段。则走分片查询单个分片节点
mycat命令台显示结果：
mysql> explain select * from ORDER0402 t1 where t1.CREATE_TIME='2016-01-03'; +-----------+--------------------------------------------------------------------------+ | DATA_NODE | SQL | +-----------+--------------------------------------------------------------------------+ | dn21 | SELECT * FROM ORDER0402 t1 WHERE t1.CREATE_TIME = '2016-01-03' LIMIT 100 | +-----------+--------------------------------------------------------------------------+ 1 row in set (0.04 sec) mysql> select * from ORDER0402 t1 where t1.CREATE_TIME='2016-01-03'; +-------+----------+--------------------------+---------------------+ | ID | PROVINCE | SN | CREATE_TIME | +-------+----------+--------------------------+---------------------+ | 10001 | shanghai | shanghai10006_2016-01-03 | 2016-01-03 00:00:00 | +-------+----------+--------------------------+---------------------+ 1 row in set (0.00 sec) mysql>
查看后台mycat日志信息：
02/12 22:44:13.773 DEBUG [$_NIOREACTOR-2-RW] (ServerQueryHandler.java:56) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]explain select * from ORDER0402 t1 where t1.CREATE_TIME='2016-01-03' 02/12 22:44:13.774 DEBUG [$_NIOREACTOR-2-RW] (EnchachePool.java:76) -SQLRouteCache miss cache ,key:TESTDB select * from ORDER0402 t1 where t1.CREATE_TIME='2016-01-03' 02/12 22:44:13.812 DEBUG [$_NIOREACTOR-2-RW] (EnchachePool.java:59) -SQLRouteCache add cache ,key:TESTDB select * from ORDER0402 t1 where t1.CREATE_TIME='2016-01-03' value:select * from ORDER0402 t1 where t1.CREATE_TIME='2016-01-03', route={ 1 -> dn21{ SELECT * FROM ORDER0402 t1 WHERE t1.CREATE_TIME = '2016-01-03' LIMIT 100} } 6。假设分片字段范围的查询。则走全部节点去检索，哪怕仅仅有一条数据在一个分片上，route路由也是走全部的分片进行检索查询
mysql> explain select * from ORDER0402 t1 where t1.CREATE_TIME<'2016-01-04'; +-----------+--------------------------------------------------------------------------+ | DATA_NODE | SQL | +-----------+--------------------------------------------------------------------------+ | dn21 | SELECT * FROM ORDER0402 t1 WHERE t1.CREATE_TIME < '2016-01-04' LIMIT 100 | | dn22 | SELECT * FROM ORDER0402 t1 WHERE t1.CREATE_TIME < '2016-01-04' LIMIT 100 | +-----------+--------------------------------------------------------------------------+ 2 rows in set (0.01 sec) mysql>
7，假设不走分片字段的查询，即使是单个数据，也要route路由全部的分片。走全部的分片进行查询
mysql> explain select * from ORDER0402 t1 where t1.SN='shanghai10006_2016-01-03'; +-----------+-------------------------------------------------------------------------------+ | DATA_NODE | SQL | +-----------+-------------------------------------------------------------------------------+ | dn21 | SELECT * FROM ORDER0402 t1 WHERE t1.SN = 'shanghai10006_2016-01-03' LIMIT 100 | | dn22 | SELECT * FROM ORDER0402 t1 WHERE t1.SN = 'shanghai10006_2016-01-03' LIMIT 100 | +-----------+-------------------------------------------------------------------------------+ 2 rows in set (0.01 sec) mysql>