1 环境准备
两台虚拟机: db01(10.0.0.51) db02(10.0.0.52) 每台创建四个mysql实例:3307 3308 3309 3310
2 删除历史环境
两台虚拟机都要执行 pkill mysqld rm -rf /data/330* mv /etc/my.cnf /etc/my.cnf.bak
3 创建相关目录初始化数据
两台虚拟机都要执行 mkdir /data/33{07..10}/data -p mysqld --initialize-insecure --user=mysql --datadir=/data/3307/data --basedir=/application/mysql mysqld --initialize-insecure --user=mysql --datadir=/data/3308/data --basedir=/application/mysql mysqld --initialize-insecure --user=mysql --datadir=/data/3309/data --basedir=/application/mysql mysqld --initialize-insecure --user=mysql --datadir=/data/3310/data --basedir=/application/mysql
4 准备配置文件和启动脚本
=========================== db01(10.0.0.51) =============================== cat >/data/3307/my.cnf<<EOF [mysqld] basedir=/application/mysql datadir=/data/3307/data socket=/data/3307/mysql.sock port=3307 log-error=/data/3307/mysql.log log_bin=/data/3307/mysql-bin binlog_format=row skip-name-resolve server-id=7 gtid-mode=on enforce-gtid-consistency=true log-slave-updates=1 EOF cat >/data/3308/my.cnf<<EOF [mysqld] basedir=/application/mysql datadir=/data/3308/data port=3308 socket=/data/3308/mysql.sock log-error=/data/3308/mysql.log log_bin=/data/3308/mysql-bin binlog_format=row skip-name-resolve server-id=8 gtid-mode=on enforce-gtid-consistency=true log-slave-updates=1 EOF cat >/data/3309/my.cnf<<EOF [mysqld] basedir=/application/mysql datadir=/data/3309/data socket=/data/3309/mysql.sock port=3309 log-error=/data/3309/mysql.log log_bin=/data/3309/mysql-bin binlog_format=row skip-name-resolve server-id=9 gtid-mode=on enforce-gtid-consistency=true log-slave-updates=1 EOF cat >/data/3310/my.cnf<<EOF [mysqld] basedir=/application/mysql datadir=/data/3310/data socket=/data/3310/mysql.sock port=3310 log-error=/data/3310/mysql.log log_bin=/data/3310/mysql-bin binlog_format=row skip-name-resolve server-id=10 gtid-mode=on enforce-gtid-consistency=true log-slave-updates=1 EOF cat >/etc/systemd/system/mysqld3307.service<<EOF [Unit] Description=MySQL Server Documentation=man:mysqld(8) Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html After=network.target After=syslog.target [Install] WantedBy=multi-user.target [Service] User=mysql Group=mysql ExecStart=/application/mysql/bin/mysqld --defaults-file=/data/3307/my.cnf LimitNOFILE = 5000 EOF cat >/etc/systemd/system/mysqld3308.service<<EOF [Unit] Description=MySQL Server Documentation=man:mysqld(8) Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html After=network.target After=syslog.target [Install] WantedBy=multi-user.target [Service] User=mysql Group=mysql ExecStart=/application/mysql/bin/mysqld --defaults-file=/data/3308/my.cnf LimitNOFILE = 5000 EOF cat >/etc/systemd/system/mysqld3309.service<<EOF [Unit] Description=MySQL Server Documentation=man:mysqld(8) Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html After=network.target After=syslog.target [Install] WantedBy=multi-user.target [Service] User=mysql Group=mysql ExecStart=/application/mysql/bin/mysqld --defaults-file=/data/3309/my.cnf LimitNOFILE = 5000 EOF cat >/etc/systemd/system/mysqld3310.service<<EOF [Unit] Description=MySQL Server Documentation=man:mysqld(8) Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html After=network.target After=syslog.target [Install] WantedBy=multi-user.target [Service] User=mysql Group=mysql ExecStart=/application/mysql/bin/mysqld --defaults-file=/data/3310/my.cnf LimitNOFILE = 5000 EOF =========================================================================== ============================= db02(10.0.0.52) ============================= cat >/data/3307/my.cnf<<EOF [mysqld] basedir=/application/mysql datadir=/data/3307/data socket=/data/3307/mysql.sock port=3307 log-error=/data/3307/mysql.log log_bin=/data/3307/mysql-bin binlog_format=row skip-name-resolve server-id=17 gtid-mode=on enforce-gtid-consistency=true log-slave-updates=1 EOF cat >/data/3308/my.cnf<<EOF [mysqld] basedir=/application/mysql datadir=/data/3308/data port=3308 socket=/data/3308/mysql.sock log-error=/data/3308/mysql.log log_bin=/data/3308/mysql-bin binlog_format=row skip-name-resolve server-id=18 gtid-mode=on enforce-gtid-consistency=true log-slave-updates=1 EOF cat >/data/3309/my.cnf<<EOF [mysqld] basedir=/application/mysql datadir=/data/3309/data socket=/data/3309/mysql.sock port=3309 log-error=/data/3309/mysql.log log_bin=/data/3309/mysql-bin binlog_format=row skip-name-resolve server-id=19 gtid-mode=on enforce-gtid-consistency=true log-slave-updates=1 EOF cat >/data/3310/my.cnf<<EOF [mysqld] basedir=/application/mysql datadir=/data/3310/data socket=/data/3310/mysql.sock port=3310 log-error=/data/3310/mysql.log log_bin=/data/3310/mysql-bin binlog_format=row skip-name-resolve server-id=20 gtid-mode=on enforce-gtid-consistency=true log-slave-updates=1 EOF cat >/etc/systemd/system/mysqld3307.service<<EOF [Unit] Description=MySQL Server Documentation=man:mysqld(8) Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html After=network.target After=syslog.target [Install] WantedBy=multi-user.target [Service] User=mysql Group=mysql ExecStart=/application/mysql/bin/mysqld --defaults-file=/data/3307/my.cnf LimitNOFILE = 5000 EOF cat >/etc/systemd/system/mysqld3308.service<<EOF [Unit] Description=MySQL Server Documentation=man:mysqld(8) Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html After=network.target After=syslog.target [Install] WantedBy=multi-user.target [Service] User=mysql Group=mysql ExecStart=/application/mysql/bin/mysqld --defaults-file=/data/3308/my.cnf LimitNOFILE = 5000 EOF cat >/etc/systemd/system/mysqld3309.service<<EOF [Unit] Description=MySQL Server Documentation=man:mysqld(8) Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html After=network.target After=syslog.target [Install] WantedBy=multi-user.target [Service] User=mysql Group=mysql ExecStart=/application/mysql/bin/mysqld --defaults-file=/data/3309/my.cnf LimitNOFILE = 5000 EOF cat >/etc/systemd/system/mysqld3310.service<<EOF [Unit] Description=MySQL Server Documentation=man:mysqld(8) Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html After=network.target After=syslog.target [Install] WantedBy=multi-user.target [Service] User=mysql Group=mysql ExecStart=/application/mysql/bin/mysqld --defaults-file=/data/3310/my.cnf LimitNOFILE = 5000 EOF
5 修改权限,启动多实例
两台虚拟机都要执行 chown -R mysql.mysql /data/* systemctl start mysqld3307 systemctl start mysqld3308 systemctl start mysqld3309 systemctl start mysqld3310 mysql -S /data/3307/mysql.sock -e "show variables like 'server_id'" mysql -S /data/3308/mysql.sock -e "show variables like 'server_id'" mysql -S /data/3309/mysql.sock -e "show variables like 'server_id'" mysql -S /data/3310/mysql.sock -e "show variables like 'server_id'"
6 节点主从规划
10.0.0.51:3307(主) <---> 10.0.0.52:3307(主) 10.0.0.51:3307(主) ---> 10.0.0.51:3309(从) 10.0.0.52:3307(主) ---> 10.0.0.52:3309(从) 10.0.0.51:3308(主) <---> 10.0.0.52:3308(主) 10.0.0.51:3308(主) ---> 10.0.0.51:3310(从) 10.0.0.52:3308(主) ---> 10.0.0.52:3310(从)
7 分片规划
shard1: Master:10.0.0.51:3307 slave1:10.0.0.51:3309 Standby Master:10.0.0.52:3307 slave2:10.0.0.52:3309 shard2: Master:10.0.0.52:3308 slave1:10.0.0.52:3310 Standby Master:10.0.0.51:3308 slave2:10.0.0.51:3310
8 开始配置
shard1 10.0.0.51:3307 <-----> 10.0.0.52:3307 db02 mysql -S /data/3307/mysql.sock -e "grant replication slave on *.* to repl@'10.0.0.%' identified by '123';" mysql -S /data/3307/mysql.sock -e "grant all on *.* to root@'10.0.0.%' identified by '123' with grant option;" db01 mysql -S /data/3307/mysql.sock -e "CHANGE MASTER TO MASTER_HOST='10.0.0.52', MASTER_PORT=3307, MASTER_AUTO_POSITION=1, MASTER_USER='repl', MASTER_PASSWORD='123';" mysql -S /data/3307/mysql.sock -e "start slave;" mysql -S /data/3307/mysql.sock -e "show slave status\G" db02 mysql -S /data/3307/mysql.sock -e "CHANGE MASTER TO MASTER_HOST='10.0.0.51', MASTER_PORT=3307, MASTER_AUTO_POSITION=1, MASTER_USER='repl', MASTER_PASSWORD='123';" mysql -S /data/3307/mysql.sock -e "start slave;" mysql -S /data/3307/mysql.sock -e "show slave status\G" 10.0.0.51:3309 ------ 10.0.0.51:3307 db01 mysql -S /data/3309/mysql.sock -e "CHANGE MASTER TO MASTER_HOST='10.0.0.51', MASTER_PORT=3307, MASTER_AUTO_POSITION=1, MASTER_USER='repl', MASTER_PASSWORD='123';" mysql -S /data/3309/mysql.sock -e "start slave;" mysql -S /data/3309/mysql.sock -e "show slave status\G" 10.0.0.52:3309 ------ 10.0.0.52:3307 db02 mysql -S /data/3309/mysql.sock -e "CHANGE MASTER TO MASTER_HOST='10.0.0.52', MASTER_PORT=3307, MASTER_AUTO_POSITION=1, MASTER_USER='repl', MASTER_PASSWORD='123';" mysql -S /data/3309/mysql.sock -e "start slave;" mysql -S /data/3309/mysql.sock -e "show slave status\G" shard2 10.0.0.52:3308 <-----> 10.0.0.51:3308 db01 mysql -S /data/3308/mysql.sock -e "grant replication slave on *.* to repl@'10.0.0.%' identified by '123';" mysql -S /data/3308/mysql.sock -e "grant all on *.* to root@'10.0.0.%' identified by '123' with grant option;" db02 mysql -S /data/3308/mysql.sock -e "CHANGE MASTER TO MASTER_HOST='10.0.0.51', MASTER_PORT=3308, MASTER_AUTO_POSITION=1, MASTER_USER='repl', MASTER_PASSWORD='123';" mysql -S /data/3308/mysql.sock -e "start slave;" mysql -S /data/3308/mysql.sock -e "show slave status\G" db01 mysql -S /data/3308/mysql.sock -e "CHANGE MASTER TO MASTER_HOST='10.0.0.52', MASTER_PORT=3308, MASTER_AUTO_POSITION=1, MASTER_USER='repl', MASTER_PASSWORD='123';" mysql -S /data/3308/mysql.sock -e "start slave;" mysql -S /data/3308/mysql.sock -e "show slave status\G" 10.0.0.52:3310 ----- 10.0.0.52:3308 db02 mysql -S /data/3310/mysql.sock -e "CHANGE MASTER TO MASTER_HOST='10.0.0.52', MASTER_PORT=3308, MASTER_AUTO_POSITION=1, MASTER_USER='repl', MASTER_PASSWORD='123';" mysql -S /data/3310/mysql.sock -e "start slave;" mysql -S /data/3310/mysql.sock -e "show slave status\G" 10.0.0.51:3310 ----- 10.0.0.51:3308 db01 mysql -S /data/3310/mysql.sock -e "CHANGE MASTER TO MASTER_HOST='10.0.0.51', MASTER_PORT=3308, MASTER_AUTO_POSITION=1, MASTER_USER='repl', MASTER_PASSWORD='123';" mysql -S /data/3310/mysql.sock -e "start slave;" mysql -S /data/3310/mysql.sock -e "show slave status\G"
9 检测主从状态
mysql -S /data/3307/mysql.sock -e "show slave status\G"|grep Yes mysql -S /data/3308/mysql.sock -e "show slave status\G"|grep Yes mysql -S /data/3309/mysql.sock -e "show slave status\G"|grep Yes mysql -S /data/3310/mysql.sock -e "show slave status\G"|grep Yes 注:如果中间出现错误,在每个节点进行执行以下命令 mysql -S /data/3307/mysql.sock -e "stop slave; reset slave all;" mysql -S /data/3308/mysql.sock -e "stop slave; reset slave all;" mysql -S /data/3309/mysql.sock -e "stop slave; reset slave all;" mysql -S /data/3310/mysql.sock -e "stop slave; reset slave all;"
10 MySQL分布式架构介绍
1. schema拆分及业务分库 2. 垂直拆分-分库分表 3. 水平拆分-分片
11 企业代表产品
360 Atlas-Sharding Alibaba cobar Mycat TDDL Heisenberg Oceanus Vitess OneProxy DRDS
1 预先安装Java运行环境
yum install -y java
2下载
Mycat-server-xxxxx.linux.tar.gz http://dl.mycat.io/ 本次实验的版本 Mycat-server-1.6.5-release-20180122220033-linux.tar.gz
3 解压文件
tar xf Mycat-server-1.6.5-release-20180122220033-linux.tar.gz
4 软件目录结构
bin catlet conf lib logs version.txt
5 启动和连接
配置环境变量 vim /etc/profile export PATH=/application/mycat/bin:$PATH source /etc/profile 启动 mycat start 连接mycat: mysql -uroot -p123456 -h 127.0.0.1 -P8066
6 配置文件简单介绍
logs目录: wrapper.log ---->mycat启动日志 mycat.log ---->mycat详细工作日志 conf目录: schema.xml 主配置文件(读写分离、高可用、分布式策略定制、节点控制) server.xml mycat软件本身相关的配置 rule.xml 分片规则配置文件,记录分片规则列表、使用方法等
1 用户创建及数据库导入 db01: mysql -S /data/3307/mysql.sock grant all on *.* to root@'10.0.0.%' identified by '123'; source /root/world.sql mysql -S /data/3308/mysql.sock grant all on *.* to root@'10.0.0.%' identified by '123'; source /root/world.sql 2 配置文件处理 cd /application/mycat/conf mv schema.xml schema.xml.bak vim schema.xml <?xml version="1.0"?> <!DOCTYPE mycat:schema SYSTEM "schema.dtd"> <mycat:schema xmlns:mycat="http://io.mycat/"> <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1"> </schema> <dataNode name="dn1" dataHost="localhost1" database= "wordpress" /> <dataHost name="localhost1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"> <heartbeat>select user()</heartbeat> <writeHost host="db1" url="10.0.0.51:3307" user="root" password="123"> <readHost host="db2" url="10.0.0.51:3309" user="root" password="123" /> </writeHost> </dataHost> </mycat:schema> 3 schema.xml配置文件介绍 3.1 逻辑库:schema <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="dn1"> </schema> 3.2 数据节点:datanode <dataNode name="dn1" dataHost="localhost1" database= "world" /> 3.3 数据主机:datahost(w和r) <dataHost name="localhost1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"> <heartbeat>select user()</heartbeat> <writeHost host="db1" url="10.0.0.51:3307" user="root" password="123"> <readHost host="db2" url="10.0.0.52:3309" user="root" password="123" /> </writeHost> </dataHost>
vim schema.xml <?xml version="1.0"?> <!DOCTYPE mycat:schema SYSTEM "schema.dtd"> <mycat:schema xmlns:mycat="http://io.mycat/"> <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="sh1"> </schema> <dataNode name="sh1" dataHost="oldguo1" database= "world" /> <dataHost name="oldguo1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"> <heartbeat>select user()</heartbeat> <writeHost host="db1" url="10.0.0.51:3307" user="root" password="123"> <readHost host="db2" url="10.0.0.51:3309" user="root" password="123" /> </writeHost> </dataHost> </mycat:schema> 重启mycat mycat restart 读写分离测试 测试: [root@db01 conf]# mysql -uroot -p123456 -h 10.0.0.51 -P 8066 读: mysql> select @@server_id; 写: mysql> begin ;select @@server_id; commit; 总结: 以上案例实现了1主1从的读写分离功能,写操作落到主库,读操作落到从库.如果主库宕机,从库不能在继续提供服务了
[root@db01 conf]# mv schema.xml schema.xml.rw [root@db01 conf]# vim schema.xml <?xml version="1.0"?> <!DOCTYPE mycat:schema SYSTEM "schema.dtd"> <mycat:schema xmlns:mycat="http://io.mycat/"> <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="sh1"> </schema> <dataNode name="sh1" dataHost="oldguo1" database= "world" /> <dataHost name="oldguo1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"> <heartbeat>select user()</heartbeat> <writeHost host="db1" url="10.0.0.51:3307" user="root" password="123"> <readHost host="db2" url="10.0.0.51:3309" user="root" password="123" /> </writeHost> <writeHost host="db3" url="10.0.0.52:3307" user="root" password="123"> <readHost host="db4" url="10.0.0.52:3309" user="root" password="123" /> </writeHost> </dataHost> </mycat:schema> 真正的writehost:负责写操作的writehost standby writeHost:和readhost一样,只提供读服务 当写节点宕机后,后面跟的readhost也不提供服务,这时候standby的writehost就提供写服务, 后面跟的readhost提供读服务 测试: mysql -uroot -p123456 -h 10.0.0.51 -P 8066 读 show variables like 'server_id'; 写 begin; show variables like 'server_id';commit; 对db01 3307节点进行关闭和启动,测试读写操作
balance属性 负载均衡类型,目前的取值有3种: 1. balance="0", 不开启读写分离机制,所有读操作都发送到当前可用的writeHost上。 2. balance="1",全部的readHost与standby writeHost参与select语句的负载均衡,简单的说, 当双主双从模式(M1->S1,M2->S2,并且M1与 M2互为主备),正常情况下,M2,S1,S2都参与select语句的负载均衡。 3. balance="2",所有读操作都随机的在writeHost、readhost上分发。 writeType属性 负载均衡类型,目前的取值有2种: 1. writeType="0", 所有写操作发送到配置的第一个writeHost, 第一个挂了切到还生存的第二个writeHost,重新启动后以切换后的为主,切换记录在配置文件中:dnindex.properties . 2. writeType=“1”,所有写操作都随机的发送到配置的writeHost,但不推荐使用 switchType属性 -1 表示不自动切换 1 默认值,自动切换 2 基于MySQL主从同步的状态决定是否切换 ,心跳语句为 show slave status datahost其他配置 <dataHost name="localhost1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"> maxCon="1000":最大的并发连接数 minCon="10" :mycat在启动之后,会在后端节点上自动开启的连接线程 tempReadHostAvailable="1" 这个一主一从时(1个writehost,1个readhost时),可以开启这个参数,如果2个writehost,2个readhost时 <heartbeat>select user()</heartbeat> 监测心跳
mv schema.xml schema.xml.ha vim schema.xml <?xml version="1.0"?> <!DOCTYPE mycat:schema SYSTEM "schema.dtd"> <mycat:schema xmlns:mycat="http://io.mycat/"> <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="sh1"> <table name="user" dataNode="sh1"/> <table name="order_t" dataNode="sh2"/> </schema> <dataNode name="sh1" dataHost="oldguo1" database= "taobao" /> <dataNode name="sh2" dataHost="oldguo2" database= "taobao" /> <dataHost name="oldguo1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"> <heartbeat>select user()</heartbeat> <writeHost host="db1" url="10.0.0.51:3307" user="root" password="123"> <readHost host="db2" url="10.0.0.51:3309" user="root" password="123" /> </writeHost> <writeHost host="db3" url="10.0.0.52:3307" user="root" password="123"> <readHost host="db4" url="10.0.0.52:3309" user="root" password="123" /> </writeHost> </dataHost> <dataHost name="oldguo2" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"> <heartbeat>select user()</heartbeat> <writeHost host="db1" url="10.0.0.51:3308" user="root" password="123"> <readHost host="db2" url="10.0.0.51:3310" user="root" password="123" /> </writeHost> <writeHost host="db3" url="10.0.0.52:3308" user="root" password="123"> <readHost host="db4" url="10.0.0.52:3310" user="root" password="123" /> </writeHost> </dataHost> </mycat:schema> 创建测试库和表: [root@db01 conf]# mysql -S /data/3307/mysql.sock -e "create database taobao charset utf8;" [root@db01 conf]# mysql -S /data/3308/mysql.sock -e "create database taobao charset utf8;" [root@db01 conf]# mysql -S /data/3307/mysql.sock -e "use taobao;create table user(id int,name varchar(20))"; [root@db01 conf]# mysql -S /data/3308/mysql.sock -e "use taobao;create table order_t(id int,name varchar(20))" 重启mycat : mycat restart 测试功能: [root@db01 conf]# mysql -uroot -p123456 -h 10.0.0.51 -P 8066 mysql> use TESTDB mysql> insert into user(id ,name ) values(1,'a'),(2,'b'); mysql> commit; mysql> insert into order_t(id ,name ) values(1,'a'),(2,'b'); mysql> commit; [root@db01 ~]# mysql -S /data/3307/mysql.sock -e "show tables from taobao;" +------------------+ | Tables_in_taobao | +------------------+ | user | +------------------+ [root@db01 ~]# mysql -S /data/3308/mysql.sock -e "show tables from taobao;" +------------------+ | Tables_in_taobao | +------------------+ | order_t | +------------------+ [root@db01 ~]#
分片:对一个"bigtable",比如说t3表 (1)行数非常多,800w (2)访问非常频繁 分片的目的: (1)将大数据量进行分布存储 (2)提供均衡的访问路由 分片策略: 范围 range 800w 1-400w 400w01-800w 取模 mod 取余数 枚举 哈希 hash 时间 流水 优化关联查询 全局表 ER分片
比如说t3表 (1)行数非常多,2000w(1-1000w:sh1 1000w01-2000w:sh2) (2)访问非常频繁,用户访问较离散 mv schema.xml schema.xml.1 vim schema.xml <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="sh1"> <table name="t3" dataNode="sh1,sh2" rule="auto-sharding-long" /> </schema> <dataNode name="sh1" dataHost="oldguo1" database= "taobao" /> <dataNode name="sh2" dataHost="oldguo2" database= "taobao" /> vim rule.xml <tableRule name="auto-sharding-long"> <rule> <columns>id</columns> <algorithm>rang-long</algorithm> </rule> <function name="rang-long" class="io.mycat.route.function.AutoPartitionByLong"> <property name="mapFile">autopartition-long.txt</property> </function> =================================== vim autopartition-long.txt 0-10=0 11-20=1 创建测试表: mysql -S /data/3307/mysql.sock -e "use taobao;create table t3 (id int not null primary key auto_increment,name varchar(20) not null);" mysql -S /data/3308/mysql.sock -e "use taobao;create table t3 (id int not null primary key auto_increment,name varchar(20) not null);" 测试: 重启mycat mycat restart mysql -uroot -p123456 -h 127.0.0.1 -P 8066 use TESTDB; insert into t3(id,name) values(1,'a'); insert into t3(id,name) values(2,'b'); insert into t3(id,name) values(3,'c'); insert into t3(id,name) values(10,'d'); insert into t3(id,name) values(11,'aa'); insert into t3(id,name) values(12,'bb'); insert into t3(id,name) values(13,'cc'); insert into t3(id,name) values(14,'dd'); insert into t3(id,name) values(20,'dd'); [root@db01 conf]# mysql -S /data/3307/mysql.sock mysql> use taobao; mysql> select * from t3; +----+------+ | id | name | +----+------+ | 1 | a | | 2 | b | | 3 | c | | 10 | d | +----+------+ 4 rows in set (0.00 sec) [root@db01 conf]# mysql -S /data/3308/mysql.sock mysql> use taobao; mysql> select * from t3; +----+------+ | id | name | +----+------+ | 11 | aa | | 12 | bb | | 13 | cc | | 14 | dd | | 20 | dd | +----+------+ 5 rows in set (0.00 sec)
取余分片方式:分片键(一个列)与节点数量进行取余,得到余数,将数据写入对应节点 vim schema.xml <table name="t4" dataNode="sh1,sh2" rule="mod-long" /> vim rule.xml <property name="count">2</property> 准备测试环境 创建测试表: mysql -S /data/3307/mysql.sock -e "use taobao;create table t4 (id int not null primary key auto_increment,name varchar(20) not null);" mysql -S /data/3308/mysql.sock -e "use taobao;create table t4 (id int not null primary key auto_increment,name varchar(20) not null);" 重启mycat mycat restart 测试: mysql -uroot -p123456 -h10.0.0.52 -P8066 use TESTDB insert into t4(id,name) values(1,'a'); insert into t4(id,name) values(2,'b'); insert into t4(id,name) values(3,'c'); insert into t4(id,name) values(4,'d'); 分别登录后端节点查询数据 mysql -S /data/3307/mysql.sock use taobao select * from t4; mysql -S /data/3308/mysql.sock use taobao select * from t4;
t5 表 id name telnum 1 bj 1212 2 sh 22222 3 bj 3333 4 sh 44444 5 bj 5555 sharding-by-intfile vim schema.xml <table name="t5" dataNode="sh1,sh2" rule="sharding-by-intfile" /> vim rule.xml <tableRule name="sharding-by-intfile"> <rule> <columns>name</columns> <algorithm>hash-int</algorithm> </rule> </tableRule> <function name="hash-int" class="org.opencloudb.route.function.PartitionByFileMap"> <property name="mapFile">partition-hash-int.txt</property> <property name="type">1</property> <property name="defaultNode">0</property> </function> partition-hash-int.txt 配置: bj=0 sh=1 DEFAULT_NODE=1 columns 标识将要分片的表字段,algorithm 分片函数, 其中分片函数配置中,mapFile标识配置文件名称 准备测试环境 mysql -S /data/3307/mysql.sock -e "use taobao;create table t5 (id int not null primary key auto_increment,name varchar(20) not null);" mysql -S /data/3308/mysql.sock -e "use taobao;create table t5 (id int not null primary key auto_increment,name varchar(20) not null);" 重启mycat mycat restart mysql -uroot -p123456 -h10.0.0.51 -P8066 use TESTDB insert into t5(id,name) values(1,'bj'); insert into t5(id,name) values(2,'sh'); insert into t5(id,name) values(3,'bj'); insert into t5(id,name) values(4,'sh'); insert into t5(id,name) values(5,'tj');
a b c d join t select t1.name ,t.x from t1 join t select t2.name ,t.x from t2 join t select t3.name ,t.x from t3 join t 使用场景: 如果你的业务中有些数据类似于数据字典,比如配置文件的配置, 常用业务的配置或者数据量不大很少变动的表,这些表往往不是特别大, 而且大部分的业务场景都会用到,那么这种表适合于Mycat全局表,无须对数据进行切分, 要在所有的分片上保存一份数据即可,Mycat 在Join操作中,业务表与全局表进行Join聚合会优先选择相同分片内的全局表join, 避免跨库Join,在进行数据插入操作时,mycat将把数据分发到全局表对应的所有分片执行,在进行数据读取时候将会随机获取一个节点读取数据。 vim schema.xml <table name="t_area" primaryKey="id" type="global" dataNode="sh1,sh2" /> 后端数据准备 mysql -S /data/3307/mysql.sock use taobao create table t_area (id int not null primary key auto_increment,name varchar(20) not null); mysql -S /data/3308/mysql.sock use taobao create table t_area (id int not null primary key auto_increment,name varchar(20) not null); 重启mycat mycat restart 测试: mysql -uroot -p123456 -h10.0.0.52 -P8066 use TESTDB insert into t_area(id,name) values(1,'a'); insert into t_area(id,name) values(2,'b'); insert into t_area(id,name) values(3,'c'); insert into t_area(id,name) values(4,'d');
A join B 为了防止跨分片join,可以使用E-R模式 A join B on a.xx=b.yy join C on A.id=C.id <table name="A" dataNode="sh1,sh2" rule="mod-long"> <childTable name="B" joinKey="yy" parentKey="xx" /> </table>