新闻中心

太阳城备用网址仿佛在他们的眼里

2016-03-10 来源: 作者:陈延鹏 责任编辑:田艳敏

摘 要:太阳城备用网址仿佛在他们的眼里 y7ic82

 太阳城备用网址仿佛在他们的眼里

绩效是风向标,正常人都太阳城备用网址仿佛在他们的眼里 会逆潮流而动 <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label> 有一个很有用的属性AssociaedControlID,把lable控件和另一个服务去控件绑定在一起 太阳城代理合作表情紧张的很

1结合Mycat日志,分析select * from travelrecord order by id limit100000,100 的执行过程,解释下当limit M,N中的M非常大的情况下,为什么查询结果会变慢很多 1.1mycat控制命令台显示,explain出来走了所有的节点 mysql>explain select * from travelrecord order by id limit 100000,100 ; +-----------+--------------------------------------------------------+ |DATA_NODE | SQL| +-----------+--------------------------------------------------------+ |dn1 | SELECT * FROM travelrecordORDER BY id LIMIT 0, 100100 | |dn2 | SELECT * FROM travelrecordORDER BY id LIMIT 0, 100100 | |dn3 | SELECT * FROM travelrecordORDER BY id LIMIT 0, 100100 | +-----------+--------------------------------------------------------+ 3rows in set (0.01 sec) mysql> 看后台mycat.log日志: 02/1417:52:30.103 DEBUG [$_NIOREACTOR-0-RW](ServerQueryHandler.java:56) -ServerConnection [id=3, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]explainselect * from travelrecord order by id limit 1000000,100 02/1417:52:30.103 DEBUG [$_NIOREACTOR-0-RW](EnchachePool.java:76) -SQLRouteCachemiss cache ,key:TESTDB select * from travelrecord order by id limit1000000,100 02/1417:52:30.105 DEBUG [$_NIOREACTOR-0-RW] (EnchachePool.java:59)-SQLRouteCache add cache ,key:TESTDB select * from travelrecord order by idlimit 1000000,100 value:select * from travelrecord order by id limit1000000,100, route={ 1 -> dn1{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} 2 -> dn2{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} 3 -> dn3{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} } 02/1417:52:33.880 DEBUG [$_NIOREACTOR-0-RW](ServerQueryHandler.java:56) -ServerConnection [id=3, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]select* from travelrecord order by id limit 1000000,100 02/1417:52:33.881 DEBUG [$_NIOREACTOR-0-RW](EnchachePool.java:76) -SQLRouteCachemiss cache ,key:TESTDBselect * from travelrecord order by id limit1000000,100 02/1417:52:33.882 DEBUG [$_NIOREACTOR-0-RW](EnchachePool.java:59) -SQLRouteCache add cache ,key:TESTDBselect * fromtravelrecord order by id limit 1000000,100 value:select * from travelrecordorder by id limit 1000000,100, route={ 1 -> dn1{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} 2 -> dn2{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} 3 -> dn3{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} } 02/1417:52:33.882 DEBUG [$_NIOREACTOR-0-RW](NonBlockingSession.java:113) -ServerConnection [id=3, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]select* from travelrecord order by id limit 1000000,100, route={ 1 -> dn1{SELECT * FROMtravelrecord ORDERBY id 02/1417:52:33.882 DEBUG [$_NIOREACTOR-0-RW](NonBlockingSession.java:113) -ServerConnection [id=3, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]select* from travelrecord order by id limit 1000000,100, route={ 1 -> dn1{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} 2 -> dn2{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} 3 -> dn3{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100} }rrs 02/1417:52:33.882 DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:82) -execute mutinode query select * from travelrecordorder by id limit 1000000,100 02/1417:52:33.882 DEBUG [$_NIOREACTOR-0-RW](MultiNodeQueryHandler.java:97) -has data merge logic 02/1417:52:33.882 DEBUG [$_NIOREACTOR-0-RW](PhysicalDBPool.java:452) -select read source hostM1 for dataHost:wgq_idc_mon_1_12 02/1417:52:33.883 DEBUG [$_NIOREACTOR-0-RW](PhysicalDBPool.java:452) -select read source hostM1 fordataHost:wgq_idc_mon_1_12 02/1417:52:33.883 DEBUG [$_NIOREACTOR-0-RW](PhysicalDBPool.java:452) -select read source hostM1 for dataHost:wgq_idc_mon_1_12 02/1417:52:33.883 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:falsefrom MySQLConnection [id=19, lastTime=1455443553868, user=root, schema=db1, oldshema=db1, borrowed=true, fromSlaveDB=false, threadId=220, charset=latin1,txIsolation=3, autocommit=true, attachment=dn1{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317, statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@b47af37,writeQueue=0, modifiedSQLExecuted=false] 02/1417:52:33.884 DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:241) -on row end reseponse MySQLConnection [id=25,lastTime=1455443553868, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=227, charset=latin1, txIsolation=3,autocommit=true, attachment=dn3{SELECT * FROMtravelrecord 02/1417:52:33.883 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:falsefrom MySQLConnection [id=19, lastTime=1455443553868, user=root, schema=db1, oldshema=db1, borrowed=true, fromSlaveDB=false, threadId=220, charset=latin1,txIsolation=3, autocommit=true, attachment=dn1{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@b47af37,writeQueue=0, modifiedSQLExecuted=false] 02/1417:52:33.884 DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:241) -on row end reseponse MySQLConnection [id=25,lastTime=1455443553868, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=227, charset=latin1, txIsolation=3,autocommit=true, attachment=dn3{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=false] 02/1417:52:33.884 DEBUG [$_NIOREACTOR-3-RW](DataMergeService.java:94) -field metadata inf:[ID=ColMeta [colIndex=0,colType=8], DAYS=ColMeta [colIndex=4, colType=3], TRAVELDATE=ColMeta[colIndex=2, colType=10], USER_ID=ColMeta [colIndex=1, colType=253],FEE=ColMeta [colIndex=3, colType=246]] 02/1417:52:33.884 DEBUG [$_NIOREACTOR-1-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=25,lastTime=1455443553868, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=227, charset=latin1, txIsolation=3,autocommit=true, attachment=dn3{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=false] 02/1417:52:33.885 DEBUG [$_NIOREACTOR-1-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=25,lastTime=1455443553868, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=227, charset=latin1, txIsolation=3,autocommit=true, attachment=null, respHandler=null, host=110.254.11.111,port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] 02/1417:52:33.886 DEBUG [$_NIOREACTOR-3-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=19,lastTime=1455443553868, user=root, schema=db1, old shema=db1, borrowed=true,fromSlaveDB=false, threadId=220, charset=latin1, txIsolation=3,autocommit=true, attachment=dn1{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100}, respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317,statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@b47af37,writeQueue=0, modifiedSQLExecuted=false] 02/1417:52:33.886 DEBUG [$_NIOREACTOR-3-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=19,lastTime=1455443553868, user=root, schema=db1, old shema=db1, borrowed=true,fromSlaveDB=false, threadId=220, charset=latin1, txIsolation=3,autocommit=true, attachment=null, respHandler=null, host=110.254.11.111, port=3317,statusSync=null, writeQueue=0, modifiedSQLExecuted=false] 02/1417:52:33.886 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:241) -on row end reseponse MySQLConnection [id=42,lastTime=1455443553868, user=root, schema=db2, old shema=db2, borrowed=true,fromSlaveDB=false, threadId=234, charset=latin1, txIsolation=3,autocommit=true, attachment=dn2{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=false] 02/1417:52:33.886 DEBUG [$_NIOREACTOR-3-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=42,lastTime=1455443553868, user=root, schema=db2, old shema=db2, borrowed=true,fromSlaveDB=false, threadId=234, charset=latin1, txIsolation=3,autocommit=true, attachment=dn2{SELECT * FROMtravelrecord ORDERBY id LIMIT0, 1000100},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@f35a686, host=110.254.11.111,port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] 02/1417:52:33.886 DEBUG [$_NIOREACTOR-3-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=42,lastTime=1455443553868, user=root, schema=db2, old shema=db2, borrowed=true,fromSlaveDB=false, threadId=234, charset=latin1, txIsolation=3,autocommit=true, attachment=null, respHandler=null, host=110.254.11.111,port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] 02/1417:52:33.887 DEBUG [BusinessExecutor5](DataMergeService.java:296) -prepare mpp merge result for select * fromtravelrecord order by id limit 1000000,100 02/1417:52:33.887 DEBUG [BusinessExecutor5](MultiNodeQueryHandler.java:324) -last packet id:8 路由里面是先查limit 0,1000000条,然后再查出limit 0,1000100条记录,在这个基础上查出100条(prepare mpp mergeresult for select * from travelrecord order by id limit 1000000,100),所以如果这个M=1000000越来越大,一次性拉的太阳城备用网址仿佛在他们的眼里 就越大,这样就越来越慢了,那么需要查询的太阳城备用网址仿佛在他们的眼里 就比较多2结合Mycat日志,分析跨分片事务的执行过程,以一个正常的跨分片SQL的事务过程,以及,一个错误SQL为例(比如某个分片上主键冲突或其他SQL错误,导致无法执行成功)分别加, 以说明2.1 正常的跨分片事务分析 执行情况: mysql>set autocommit=0 mysql>update order040302 set SN=concat(SN,'-mycat'); QueryOK, 2 rows affected (0.01 sec) Rowsmatched: 1 Changed: 1 Warnings: 0 mysql>commit; mycat.log日志显示: 02/1800:01:24.351 DEBUG [$_NIOREACTOR-1-RW](ServerQueryHandler.java:56) -ServerConnection [id=4, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]updateorder040302 set SN=concat(SN,'-mycat') 02/1800:01:24.356 DEBUG [$_NIOREACTOR-1-RW](NonBlockingSession.java:113) -ServerConnection [id=4, schema=TESTDB,host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]updateorder040302 set SN=concat(SN,'-mycat'), route={ 1 -> dn21{update order040302 setSN=concat(SN,'-mycat')} 2 -> dn22{update order040302 setSN=concat(SN,'-mycat')} }rrs 02/1800:01:24.356 DEBUG [$_NIOREACTOR-1-RW](MultiNodeQueryHandler.java:82) -execute mutinode query update order040302 setSN=concat(SN,'-mycat') 02/1800:01:24.357 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:falsefrom MySQLConnection [id=7, lastTime=1455724884356, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=218, charset=latin1,txIsolation=3, autocommit=true, attachment=dn21{update order040302 setSN=concat(SN,'-mycat')},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@23eca0d1,host=110.254.11.111, port=3317, statusSync=org.opencloudb.mysql.nio.MySQLConnection$StatusSync@71a27302,writeQueue=0, modifiedSQLExecuted=true] 02/1800:01:24.358 DEBUG [$_NIOREACTOR-2-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:truefrom MySQLConnection [id=30, lastTime=1455724884356, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=200, charset=latin1,txIsolation=3, autocommit=true, attachment=dn22{update order040302 setSN=concat(SN,'-mycat')},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@23eca0d1,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/1800:01:24.359 DEBUG [$_NIOREACTOR-2-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=30,lastTime=1455724884356, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=200, charset=latin1, txIsolation=3,autocommit=true, attachment=dn22{update order040302 setSN=concat(SN,'-mycat')},respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@23eca0d1,host=110.254.11.111, port=3327, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/1800:01:24.359 DEBUG [$_NIOREACTOR-3-RW](MultiNodeQueryHandler.java:171) -received ok response ,executeResponse:truefrom MySQLConnection [id=7, lastTime=1455724884356, user=root, schema=db3, oldshema=db3, borrowed=true, fromSlaveDB=false, threadId=218, charset=latin1,txIsolation=3, autocommit=true, attachment=dn21{update order040302 setSN=concat(SN,'-mycat')}, respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@23eca0d1,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/1800:01:24.359 DEBUG [$_NIOREACTOR-3-RW](NonBlockingSession.java:229) -release connection MySQLConnection [id=7,lastTime=1455724884356, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=218, charset=latin1, txIsolation=3,autocommit=true, attachment=dn21{update order040302 setSN=concat(SN,'-mycat')}, respHandler=org.opencloudb.mysql.nio.handler.MultiNodeQueryHandler@23eca0d1,host=110.254.11.111, port=3317, statusSync=null, writeQueue=0,modifiedSQLExecuted=true] 02/1800:01:24.359 DEBUG [$_NIOREACTOR-3-RW](PhysicalDatasource.java:403) -release channel MySQLConnection [id=7,lastTime=1455724884356, user=root, schema=db3, old shema=db3, borrowed=true,fromSlaveDB=false, threadId=218, charset=latin1, txIsolation=3,autocommit=true, attachment=null, respHandler=null, host=110.254.11.111,port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false] 分析结果:update语句是修改所有的节点上的太阳城备用网址仿佛在他们的眼里 ,02/18 00:01:24.356处NonBlockingSession启动了分布式事务,下面就分别在02/18 00:01:24.359有2处 NonBlockingSession.java:229在dn21、dn22上面执行了2遍,大家看到在2个节点dn21和dn22都执行完毕后,才有(PhysicalDatasource.java:403)-release channel MySQLConnection开始关闭释放连接,也就是说等所有节点都执行完毕后才结束整个事务

在JAVA NIO中有三个核心的组件:Channels、Buffers和Selectors 百家_乐网上开户并没有说些什么

百威娱乐城开户江云微眯着眼睛

太阳城备用网址仿佛在他们的眼里

3、在wifidog-gateway-master文件夹下创建Android.mk文件,内容如下:LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE := wifidogLOCAL_C_INCLUDES=$(LOCAL_PATH)/libhttpd LOCAL_SRC_FILES = src/gateway.c \ src/auth.c \ src/client_list.c \ src/conf.c \ src/firewall.c \ src/http.c \ src/safe.c \ src/centralserver.c \ src/commandline.c \ src/debug.c \ src/fw_iptables.c \ src/httpd_thread.c \ src/ping_thread.c \ src/util.c \ src/wdctl_thread.c \ src/simple_http.c \ src/pstring.c \ src/wd_util.c \ src/main.c \ ./libhttpd/api.c \ ./libhttpd/ip_acl.c \ ./libhttpd/protocol.c \ ./libhttpd/version.c LOCAL_LDLIBS += -lpthreadLOCAL_SHARED_LIBRARIES = $(SHARED_LIBRARIES)include $(BUILD_EXECUTABLE)4、执行mmm extern/wifidog-gateway-master,在out目录下的system/bin下会生成wifidog

LeetCode解题之Balanced Binary Tree原题判断一棵二叉树是否是平衡二叉树,只有当每个节点的左右两棵子树的高度差太阳城备用网址仿佛在他们的眼里 大于1时,这棵树才是平衡的 最准永利高比分骑着满是盔甲的骑士

一般来说,当条件简单且可能情况较少时使用if语句;当条件比较复杂情况较多时则可以考虑使用swich语句

虽然,心里发怵,但是也没有办法,刚来这里,没有亲戚朋友可以依靠,只能工作先定下来,否则身上的两千块钱估计也撑太阳城备用网址仿佛在他们的眼里 了多久 真钱百家_乐送钱第三十二章

TestBencher Pro是一个优秀的测试大规模FPGA 和 ASIC设计的工具

p>绩效是风向标,正常人都太阳城备用网址仿佛在他们的眼里 会逆潮流而动 东方太阳城供热顿时有了动作

【更多热点请手机下载《爱济南》客户端 山东大小事尽在掌握】

原标题:太阳城备用网址仿佛在他们的眼里
分享到:
值班主任:田艳敏
免责声明:凡本网注明“来源:XXX(非舜网)”的作品,均转载自其它媒体,转载目的在于传递更多信息,并不代表本网赞同其观点和对其真实性负责。本网转载其他媒体之稿件,意在为公众提供免费服务。如稿件版权单位或个人不想在本网发布,可与本网联系,本网视情况可立即将其撤除。