mycat 连续分片 -> 按日期（天）分片
1，按日期（天）分片
按日期（天）分片：从开始日期算起，按照天数来分片
例如，从2016-01-01，每10天一个分片
注意事项：需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，添加配置文件
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，建表并且录入数据
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，参考mycat.log对路由过程做完整的分析
查看后台mycat.log分析如下：
开始获取连接：
02/12 22:23:26.386 DEBUG [$_NIOREACTOR-2-RW] (ServerQueryHandler.java:56) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(5000001,'shanghai','shanghai10006_2016-01-13','2016-01-13')
开始路由匹配：
02/12 22:23:26.388 DEBUG [$_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，直接往对应的dn22节点开始执行insert数据录入操作：
02/12 22:23:26.403 DEBUG [$_NIOREACTOR-1-RW] (NonBlockingSession.java:229) -release connection MySQLConnection [id=17, lastTime=1455287006372, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=90, charset=latin1, txIsolation=3, autocommit=true, attachment=dn22{INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(5000001,'shanghai','shanghai10006_2016-01-13','2016-01-13')}, respHandler=SingleNodeHandler [node=dn22{INSERT INTO ORDER0402(ID,PROVINCE,SN,CREATE_TIME) VALUES(5000001,'shanghai','shanghai10006_2016-01-13','2016-01-13')}, packetId=0], host=13.23.1.11, port=3327, statusSync=null, writeQueue=0, modifiedSQLExecuted=true]
操作完成，开始释放连接：
02/12 22:23:26.404 DEBUG [$_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，执行简单的查询，如果指定分片字段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，如果分片字段范围的查询，则走所有节点去检索，哪怕只有一条数据在一个分片上，route路由也是走所有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，如果不走分片字段的查询，即使是单个数据，也要route路由所有的分片，走所有的分片进行查询
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>