执行 select * from travelrecord ，分析Debug日志，说明整个执行逻辑，包括连接获取，连接同步信息，数据合并，数据返回，连接释放

新增一个分片表 T_VOTE (ID,PROVINCE),PROVINCE用hash分片，并用reload命令方式重载生效，截图和文字说明整个过程。

MySQL Server里Server端字符集UTF8情况下，当客户端字符集配置为latin 与UTF8的情况下，，通过MySQL客户端登录Mycat，执行select操作，通过日志分析，看看MyCAT的执行过程有哪些差别。

1:

mysql> select * from travelrecord;

ERROR 2006 (HY000): MySQL server has gone away

No connection. Trying to reconnect...

Connection id: 6

Current database: TESTDB

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

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

| 1 | wang | 2014-01-05 | 511 | 3 |

| 7000001 | wang | 2014-01-05 | 511 | 3 |

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

2 rows in set (0.26 sec)

[mysql@hongquan ~]$ mysql -usystem -pmysql -P9066 -h10.0.1.134 -DTESTDB

mysql> show @@cache;

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

| CACHE | MAX | CUR | ACCESS | HIT | PUT | LAST_ACCESS | LAST_PUT |

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

| ER_SQL2PARENTID | 1000 | 0 | 0 | 0 | 0 | 0 | 0 |

| SQLRouteCache | 10000 | 1 | 7 | 0 | 2 | 1478596909351 | 1478596909353 |

| TableID2DataNodeCache.TESTDB_ORDERS | 50000 | 0 | 0 | 0 | 0 | 0 | 0 |

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

执行查询

mysql> select * from company;

mysql> select * from travelrecord;

mysql> show @@cache;

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

| CACHE | MAX | CUR | ACCESS | HIT | PUT | LAST_ACCESS | LAST_PUT |

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

| ER_SQL2PARENTID | 1000 | 0 | 0 | 0 | 0 | 0 | 0 |

| SQLRouteCache | 10000 | 1 | 12 | 3 | 2 | 1478596994245 | 1478596909353 |

| TableID2DataNodeCache.TESTDB_ORDERS | 50000 | 0 | 0 | 0 | 0 | 0 | 0 |

debug 日志

2016-11-08 00:33:29.115 INFO [$_NIOREACTOR-0-RW] (io.mycat.net.handler.FrontendAuthenticator.success(FrontendAuthenticator.java:194)) - ServerConnection [id=6, schema=TESTDB, host=10.0.1.134, user=system,txIsolation=3, autocommit=true, schema=TESTDB]'system' login success

2016-11-08 00:33:29.121 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.net.FrontendConnection.query(FrontendConnection.java:288)) - ServerConnection [id=6, schema=TESTDB, host=10.0.1.134, user=system,txIsolation=3, autocommit=true, schema=TESTDB] show databases

2016-11-08 00:33:29.122 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.server.ServerQueryHandler.query(ServerQueryHandler.java:57)) - ServerConnection [id=6, schema=TESTDB, host=10.0.1.134, user=system,txIsolation=3, autocommit=true, schema=TESTDB]show databases

2016-11-08 00:33:29.127 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.net.FrontendConnection.query(FrontendConnection.java:288)) - ServerConnection [id=6, schema=TESTDB, host=10.0.1.134, user=system,txIsolation=3, autocommit=true, schema=TESTDB] show tables

2016-11-08 00:33:29.127 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.server.ServerQueryHandler.query(ServerQueryHandler.java:57)) - ServerConnection [id=6, schema=TESTDB, host=10.0.1.134, user=system,txIsolation=3, autocommit=true, schema=TESTDB]show tables

2016-11-08 00:33:29.130 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.net.FrontendConnection.query(FrontendConnection.java:288)) - ServerConnection [id=6, schema=TESTDB, host=10.0.1.134, user=system,txIsolation=3, autocommit=true, schema=TESTDB] select * from travelrecord

2016-11-08 00:33:29.130 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.server.ServerQueryHandler.query(ServerQueryHandler.java:57)) - ServerConnection [id=6, schema=TESTDB, host=10.0.1.134, user=system,txIsolation=3, autocommit=true, schema=TESTDB]select * from travelrecord

2016-11-08 00:33:29.130 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.cache.impl.EnchachePool.get(EnchachePool.java:77)) - SQLRouteCache miss cache ,key:TESTDBselect * from travelrecord

2016-11-08 00:33:29.188 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.cache.impl.EnchachePool.putIfAbsent(EnchachePool.java:60)) - SQLRouteCache add cache ,key:TESTDBselect * from travelrecord value:select * from travelrecord, route={

1 -> dn1{SELECT *

FROM travelrecord

LIMIT 100}

2 -> dn2{SELECT *

FROM travelrecord

LIMIT 100}

3 -> dn3{SELECT *

FROM travelrecord

LIMIT 100}

}

2016-11-08 00:33:29.189 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.server.NonBlockingSession.execute(NonBlockingSession.java:119)) - ServerConnection [id=6, schema=TESTDB, host=10.0.1.134, user=system,txIsolation=3, autocommit=true, schema=TESTDB]select * from travelrecord, route={

1 -> dn1{SELECT *

FROM travelrecord

LIMIT 100}

2 -> dn2{SELECT *

FROM travelrecord

LIMIT 100}

3 -> dn3{SELECT *

FROM travelrecord

LIMIT 100}

} rrs

2016-11-08 00:33:29.235 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.<init>(MultiNodeQueryHandler.java:101)) - execute mutinode query select * from travelrecord

2016-11-08 00:33:29.242 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.<init>(MultiNodeQueryHandler.java:137)) - has data merge logic

2016-11-08 00:33:29.242 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.execute(MultiNodeQueryHandler.java:170)) - rrs.getRunOnSlave()-null

2016-11-08 00:33:29.242 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.execute(MultiNodeQueryHandler.java:185)) - node.getRunOnSlave()1-null

2016-11-08 00:33:29.242 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.execute(MultiNodeQueryHandler.java:187)) - node.getRunOnSlave()2-null

2016-11-08 00:33:29.243 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.datasource.PhysicalDBNode.getConnection(PhysicalDBNode.java:96)) - rrs.getRunOnSlave() null

2016-11-08 00:33:29.243 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.datasource.PhysicalDBNode.getConnection(PhysicalDBNode.java:127)) - rrs.getRunOnSlave() null

2016-11-08 00:33:29.243 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.datasource.PhysicalDBPool.getRWBanlanceCon(PhysicalDBPool.java:456)) - select read source hostS1 for dataHost:localhost0

2016-11-08 00:33:29.244 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.MySQLConnection.synAndDoExecute(MySQLConnection.java:448)) - con need syn ,total syn cmd 1 commands schema change:true con:MySQLConnection [id=117, lastTime=1478594009244, user=system, schema=db1, old shema=db3, borrowed=true, fromSlaveDB=true, threadId=267, charset=utf8, txIsolation=3, autocommit=true, attachment=dn1{SELECT *

FROM travelrecord

LIMIT 100}, respHandler=io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler@64d72a05, host=192.168.3.110, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

2016-11-08 00:33:29.245 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.execute(MultiNodeQueryHandler.java:185)) - node.getRunOnSlave()1-null

2016-11-08 00:33:29.245 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.execute(MultiNodeQueryHandler.java:187)) - node.getRunOnSlave()2-null

2016-11-08 00:33:29.246 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.datasource.PhysicalDBNode.getConnection(PhysicalDBNode.java:96)) - rrs.getRunOnSlave() null

2016-11-08 00:33:29.246 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.datasource.PhysicalDBNode.getConnection(PhysicalDBNode.java:127)) - rrs.getRunOnSlave() null

2016-11-08 00:33:29.246 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.datasource.PhysicalDBPool.getRWBanlanceCon(PhysicalDBPool.java:456)) - select read source hostS1 for dataHost:localhost0

2016-11-08 00:33:29.247 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.execute(MultiNodeQueryHandler.java:185)) - node.getRunOnSlave()1-null

2016-11-08 00:33:29.247 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.execute(MultiNodeQueryHandler.java:187)) - node.getRunOnSlave()2-null

2016-11-08 00:33:29.247 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.datasource.PhysicalDBNode.getConnection(PhysicalDBNode.java:96)) - rrs.getRunOnSlave() null

2016-11-08 00:33:29.247 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.datasource.PhysicalDBNode.getConnection(PhysicalDBNode.java:127)) - rrs.getRunOnSlave() null

2016-11-08 00:33:29.247 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.datasource.PhysicalDBPool.getRWBanlanceCon(PhysicalDBPool.java:456)) - select read source hostS1 for dataHost:localhost0

2016-11-08 00:33:29.249 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.okResponse(MultiNodeQueryHandler.java:236)) - received ok response ,executeResponse:false from MySQLConnection [id=117, lastTime=1478594009234, user=system, schema=db1, old shema=db1, borrowed=true, fromSlaveDB=true, threadId=267, charset=utf8, txIsolation=3, autocommit=true, attachment=dn1{SELECT *

FROM travelrecord

LIMIT 100}, respHandler=io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler@64d72a05, host=192.168.3.110, port=3306, statusSync=io.mycat.backend.mysql.nio.MySQLConnection$StatusSync@39b66fca, writeQueue=0, modifiedSQLExecuted=false]

2016-11-08 00:33:29.349 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.rowEofResponse(MultiNodeQueryHandler.java:316)) - on row end reseponse MySQLConnection [id=117, lastTime=1478594009234, user=system, schema=db1, old shema=db1, borrowed=true, fromSlaveDB=true, threadId=267, charset=utf8, txIsolation=3, autocommit=true, attachment=dn1{SELECT *

FROM travelrecord

2016-11-08 00:33:29.349 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.server.NonBlockingSession.releaseConnection(NonBlockingSession.java:354)) - release connection MySQLConnection [id=117, lastTime=1478594009234, user=system, schema=db1, old shema=db1, borrowed=true, fromSlaveDB=true, threadId=267, charset=utf8, txIsolation=3, autocommit=true, attachment=dn1{SELECT *

FROM travelrecord

2016-11-08 00:33:29.350 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.datasource.PhysicalDatasource.releaseChannel(PhysicalDatasource.java:442)) - release channel MySQLConnection [id=117, lastTime=1478594009234, user=system, schema=db1, old shema=db1, borrowed=true, fromSlaveDB=true, threadId=267, charset=utf8, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=192.168.3.110, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

2016-11-08 00:33:29.350 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.rowEofResponse(MultiNodeQueryHandler.java:316)) - on row end reseponse MySQLConnection [id=19, lastTime=1478594009234, user=system, schema=db2, old shema=db2, borrowed=true, fromSlaveDB=true, threadId=229, charset=utf8, txIsolation=3, autocommit=true, attachment=dn2{SELECT *

FROM travelrecord

LIMIT 100}, respHandler=io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler@64d72a05, host=192.168.3.110, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

2016-11-08 00:33:29.350 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.server.NonBlockingSession.releaseConnection(NonBlockingSession.java:354)) - release connection MySQLConnection [id=19, lastTime=1478594009234, user=system, schema=db2, old shema=db2, borrowed=true, fromSlaveDB=true, threadId=229, charset=utf8, txIsolation=3, autocommit=true, attachment=dn2{SELECT *

FROM travelrecord

LIMIT 100}, respHandler=io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler@64d72a05, host=192.168.3.110, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

2016-11-08 00:33:29.350 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.datasource.PhysicalDatasource.releaseChannel(PhysicalDatasource.java:442)) - release channel MySQLConnection [id=19, lastTime=1478594009234, user=system, schema=db2, old shema=db2, borrowed=true, fromSlaveDB=true, threadId=229, charset=utf8, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=192.168.3.110, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

2016-11-08 00:33:29.350 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.rowEofResponse(MultiNodeQueryHandler.java:316)) - on row end reseponse MySQLConnection [id=87, lastTime=1478594009234, user=system, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=true, threadId=257, charset=utf8, txIsolation=3, autocommit=true, attachment=dn3{SELECT *

FROM travelrecord

LIMIT 100}, respHandler=io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler@64d72a05, host=192.168.3.110, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

2016-11-08 00:33:29.350 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.server.NonBlockingSession.releaseConnection(NonBlockingSession.java:354)) - release connection MySQLConnection [id=87, lastTime=1478594009234, user=system, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=true, threadId=257, charset=utf8, txIsolation=3, autocommit=true, attachment=dn3{SELECT *

FROM travelrecord

LIMIT 100}, respHandler=io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler@64d72a05, host=192.168.3.110, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

2016-11-08 00:33:29.350 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.datasource.PhysicalDatasource.releaseChannel(PhysicalDatasource.java:442)) - release channel MySQLConnection [id=87, lastTime=1478594009234, user=system, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=true, threadId=257, charset=utf8, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=192.168.3.110, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

2016-11-08 00:33:29.352 DEBUG [BusinessExecutor0] (io.mycat.memory.unsafe.utils.sort.UnsafeExternalRowSorter.cleanupResources(UnsafeExternalRowSorter.java:109)) - row sorter clean up resources!!!

2016-11-08 00:33:29.370 DEBUG [BusinessExecutor0] (io.mycat.memory.unsafe.memory.mm.DataNodeMemoryManager.releaseExecutionMemory(DataNodeMemoryManager.java:184)) - Thread25 release 1024.0 KB from io.mycat.memory.unsafe.utils.sort.UnsafeExternalSorter@6ec1c256

2016-11-08 00:33:29.370 DEBUG [BusinessExecutor0] (io.mycat.memory.unsafe.memory.mm.DataNodeMemoryManager.releaseExecutionMemory(DataNodeMemoryManager.java:184)) - Thread25 release 128.0 KB from io.mycat.memory.unsafe.utils.sort.UnsafeExternalSorter@6ec1c256

2016-11-08 00:33:29.370 DEBUG [BusinessExecutor0] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.outputMergeResult(MultiNodeQueryHandler.java:441)) - last packet id:10

2016-11-08 00:33:29.370 DEBUG [BusinessExecutor0] (io.mycat.memory.unsafe.utils.sort.UnsafeExternalRowSorter.cleanupResources(UnsafeExternalRowSorter.java:109)) - row sorter clean up resources!!!

分析：

SQLRouteCache miss cache ,key:TESTDBselect * from travelrecord

从路由缓存中查询，发现没有

1 -> dn1{SELECT *

FROM travelrecord

LIMIT 100}

2 -> dn2{SELECT *

FROM travelrecord

LIMIT 100}

3 -> dn3{SELECT *

FROM travelrecord

LIMIT 100}

}

putIfAbsent ，将查询路由put到路由缓存中

1 -> dn1{SELECT *

FROM travelrecord

LIMIT 100}

2 -> dn2{SELECT *

FROM travelrecord

LIMIT 100}

3 -> dn3{SELECT *

FROM travelrecord

LIMIT 100}

} rrs

2016-11-08 00:33:29.235 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.<init>(MultiNodeQueryHandler.java:101)) - execute mutinode query select * from travelrecord

sql的执行路由计划，可以看到sql具体被分配到那个分片执行

2016-11-08 00:33:29.242 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.<init>(MultiNodeQueryHandler.java:137)) - has data merge logic

2016-11-08 00:33:29.242 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.execute(MultiNodeQueryHandler.java:170)) - rrs.getRunOnSlave()-null

2016-11-08 00:33:29.242 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.execute(MultiNodeQueryHandler.java:185)) - node.getRunOnSlave()1-null

2016-11-08 00:33:29.242 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler.execute(MultiNodeQueryHandler.java:187)) - node.getRunOnSlave()2-null

MultiNodeQueryHandler.java ，put缓存池

2016-11-08 00:33:29.243 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.datasource.PhysicalDBPool.getRWBanlanceCon(PhysicalDBPool.java:456)) - select read source hostS1 for dataHost:localhost0

从只读datahost hostS1上读取

, respHandler=io.mycat.backend.mysql.nio.handler.MultiNodeQueryHandler@64d72a05, host=192.168.3.110, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

readhost配置，host=192.168.3.110

2016-11-08 00:33:29.350 DEBUG [$_NIOREACTOR-0-RW] (io.mycat.backend.datasource.PhysicalDatasource.releaseChannel(PhysicalDatasource.java:442)) - release channel MySQLConnection [id=87, lastTime=1478594009234, user=system, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=true, threadId=257, charset=utf8, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=192.168.3.110, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]

释放连接

2:

T_VOTE (ID,PROVINCE),PROVINCE

[mycat@hongquan conf]$ vim rule.xml

<rule>

<columns>PROVINCE</columns>

<algorithm>hash-int-testhq</algorithm>

</rule>

</tableRul>

<function name="hash-int-testhq"

class="org.opencloudb.route.function.PartitionByFileMap">

<property name="mapFile">partition-hash-int-testhq.txt</property>

</function>

[mycat@hongquan conf]$ touch partition-hash-int-testhq.txt

[mycat@hongquan conf]$ vim partition-hash-int-testhq.txt

sichuan=0

guangdong=1

hunan=2

DEFAULT_NODE=0

[mycat@hongquan conf]$ chmod 777 partition-hash-int-testhq.txt

[mycat@hongquan conf]$ vim schema.xml

mysql> explain create table T_VOTE (ID int not null primary key,PROVINCE varchar(100) not null);

ERROR 2006 (HY000): MySQL server has gone away

No connection. Trying to reconnect...

Connection id: 13

Current database: TESTDB

ERROR 1064 (HY000): op table not in schema----T_VOTE

mysql> reload @@config;

ERROR 1003 (HY000): Reload config failure

--查看错误日志

INFO | jvm 1 | 2016/11/09 00:33:38 | Caused by: io.mycat.config.util.ConfigException: org.xml.sax.SAXParseException; lineNumber: 38; columnNumber: 11; The element type "tableRule" must be terminated by the matching end-tag "</tableRule>".

INFO | jvm 1 | 2016/11/09 00:33:38 | Caused by: org.xml.sax.SAXParseException; lineNumber: 38; columnNumber: 11; The element type "tableRule" must be terminated by the matching end-tag "</tableRule>".

</tableRul> ----> </tableRule> --修改

INFO | jvm 1 | 2016/11/09 00:35:47 | WrapperSimpleApp: Encountered an error running main: java.lang.ExceptionInInitializerError

INFO | jvm 1 | 2016/11/09 00:35:47 | Caused by: io.mycat.config.util.ConfigException: java.lang.ClassNotFoundException: org.opencloudb.route.function.PartitionByFileMap

INFO | jvm 1 | 2016/11/09 00:35:47 | Caused by: java.lang.ClassNotFoundException: org.opencloudb.route.function.PartitionByFileMap

class="org.opencloudb.route.function.PartitionByFileMap"> -->io.mycat.route.function.PartitionByFileMap ---修改

--启动正常

mysql> explain create table T_VOTE (ID int not null primary key,PROVINCE varchar(100) not null);

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

| DATA_NODE | SQL |

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

| dn2 | create table T_VOTE (ID int not null primary key,PROVINCE varchar(100) not null) |

| dn1 | create table T_VOTE (ID int not null primary key,PROVINCE varchar(100) not null) |

| dn3 | create table T_VOTE (ID int not null primary key,PROVINCE varchar(100) not null) |

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

3 rows in set (0.03 sec)

mysql> create table T_VOTE (ID int not null primary key,PROVINCE varchar(100) not null);

Query OK, 0 rows affected (0.86 sec)

--database()

insert into T_VOTE(ID,PROVINCE) values(1,'sichuan');

insert into T_VOTE(ID,PROVINCE) values(2,'guangdong');

insert into T_VOTE(ID,PROVINCE) values(3,'hunan');

select * from T_VOTE;

mysql> explain select * from T_VOTE;

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

| DATA_NODE | SQL |

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

| dn1 | SELECT * FROM T_VOTE LIMIT 100 |

| dn2 | SELECT * FROM T_VOTE LIMIT 100 |

| dn3 | SELECT * FROM T_VOTE LIMIT 100 |

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

3 rows in set (0.01 sec)

mysql> select * from T_VOTE;

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

| ID | PROVINCE |

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

| 2 | guangdong |

| 1 | sichuan |

| 3 | hunan |

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

3 rows in set (0.15 sec)

mycat 新增分片和字符集的更多相关文章

MyCat 枚举分片设计思考,查询命中条件
Mycat多租户实现的两种方式 MyCat,各种分片规则,仅保证插入的时候分片.表关联,join,查询怎么命中分片条件,还是需要设计. 今天稍微测了一下. ER 分片,此方式,插入的时候能分片,但是查 ...
Mysql系列六：（Mycat分片路由原理、Mycat常用分片规则及对应源码介绍）
一.Mycat分片路由原理我们先来看下面的一个SQL在Mycat里面是如何执行的: , ); 有3个分片dn1,dn2,dn3, id=5000001这条数据在dn2上,id=10000001这条数 ...
JAVAEE——宜立方商城13：Mycat数据库分片、主从复制、读写分离、100%Linux中成功安装Mysql的方法
1 海量数据的存储问题如今随着互联网的发展,数据的量级也是撑指数的增长,从GB到TB到PB.对数据的各种操作也是愈加的困难,传统的关系性数据库已经无法满足快速查询与插入数据的需求.这个时候NoSQL ...
JAVAEE——宜立方商城13：订单系统实现、订单生成、Mycat数据库分片
1. 学习计划 1.订单系统实现 2.订单生成 3.Mycat数据库分片 2. 订单系统 2.1. 功能分析 1.在购物车页面点击“去结算”按钮,跳转到订单确认页面 a) 必须要求用户登录 b) 使用 ...
Mycat 月分片方法
概述本篇文章主要介绍Mycat以月进行分片的方法,包括配置方法.注意事项等. mycat版本:1.4 数据节点:dn1,dn2,dn3 架构:主从配置创建测试表 CREATE TABLE `t ...
MyCAT ER分片的验证
在这里,构造了两张表,熟悉Oracle的童鞋都知道,dept(部门表)和emp(员工表),其中dept中的deptno是emp表中dept_no的外键. 两表的建表语句如下: create table ...
MyCAT常用分片规则之分片枚举
MyCAT支持多种分片规则,下面测试的这种是分片枚举.适用场景,列值的个数是固定的,譬如省份,月份等. 在这里,需定义三个值,规则均是在rule.xml中定义. 1. tableRule 2. fun ...
Mycat跨分片Join
1 前言 Mycat目前版本支持跨分片的join,主要实现的方式有四种. 全局表 ER分片 HBT(参考MyCAT人工智能解决跨分片SQL.docx) ShareJoin ShareJoin在开发版中 ...
MyCat的分片规则
1. 枚举法: 通过在配置文件中配置可能的枚举id,自己配置分片,使用规则: <tableRule name="sharding-by-intfile"> <ru ...

随机推荐

Apache Phoenix的序列
序列作为标准SQL特性,允许生成递增的序列并应用在典型的ID中.为了创建一个序列,可以使用: 0:jdbc:phoenix:SZB-L0023780:2181:/hbase114> CREATE ...
Compaction介绍
Compaction介绍 Compaction是buffer->flush->merge的Log-Structured Merge-Tree模型的关键操作,主要起到如下几个作用: 1)合并 ...
linux（centos）安装Maven
搭建maven 下载jar包,将apache-maven-3.2.2-bin.tar.gz上传到服务器 1.解压 tar -zvxf apache-maven-3.2.2-bin.tar.gz 2.移 ...
Asp.net 检测到有潜在危险的 Request.From值
因为Asp.net对客户端提交的数据进行了基本的安全验证,检测是否有最基础的 sql注入或者 xss跨站脚本攻击代码. 如果你提交了:</div><script type=&quo ...
The tag handler class for "c:forEach" (org.apache.taglibs.standard.tag.rt.core.ForEachTag) was not found on the Java Build Path
.tag出现如上错误 <%@ page language="java" contentType="text/html; charset=GB18030" ...
算法练习4---冒泡排序java版
冒泡排序的基本思想:在要排序的一组数中,对当前还未排好序的范围内的全部数,自上而下对相邻的两个数依次进行比较和调整,让较大的数往下沉,较小的往上冒.即:每当两相邻的数比较后发现它们的排序与排序要求相反 ...
hzau 1208 Color Circle（dfs）
1208: Color Circle Time Limit: 1 Sec Memory Limit: 1280 MBSubmit: 289 Solved: 85[Submit][Status][W ...
hdu 2490 队列优化dp
http://acm.hdu.edu.cn/showproblem.php?pid=2490 Parade Time Limit: 4000/2000 MS (Java/Others) Memo ...
SQLSERVER XML 类型列的模糊查询
select <column_name> from MyTable where <column_name>.value('(/root/sub-tag)[1]', 'varch ...
总结js创建object的方式（对象）
1.使用new操作符后跟Object构造函数如: var person = new Object(); 可以写成 var person = {}; person.name = "kitty ...

mycat 新增分片和字符集

1:

2:

mycat 新增分片和字符集的更多相关文章

随机推荐

热门专题