Mycat是一个开源的分布式数据库系统,其核心功能是分表分库,即将一个大表水平分割为多个小表,
存储在后端MySQL或者其他数据库里。取名Mycat原因一是简单好记,另一个则是希望未来能够入驻 Apache,
Apache的开源产品Tomcat也是一只猫。
MyCAT 是一个彻底开源的,面向企业应用开发的“大数据库集群” 支持事务、ACID、可以替代Mysql的加强版数据库;
一个可以视为“Mysql”集群的企业级数据库,用来替代昂贵的Oracle集群 ; 一个融合内存缓存技术、Nosql技术、
HDFS大数据的新型SQL Server; 结合传统数据库和新型分布式数据仓库的新一代企业级数据库产品 ; 一个新颖的
数据库中间件产品。
1. MyCAT基础架构准备
1.1 环境准备:
两台虚拟机 db01 db02
每台创建四个mysql实例:3307 3308 3309 3310
1.2 创建相关目录初始化数据
mkdir /data/33{07..10}/data -p mysqld --initialize-insecure --user=mysql --datadir=/data/3307/data --basedir=/usr/local/mysql mysqld --initialize-insecure --user=mysql --datadir=/data/3308/data --basedir=/usr/local/mysql mysqld --initialize-insecure --user=mysql --datadir=/data/3309/data --basedir=/usr/local/mysql mysqld --initialize-insecure --user=mysql --datadir=/data/3310/data --basedir=/usr/local/mysql
1.3 准备DB01配置文件和启动脚本
cat >/data/3307/my.cnf< [mysqld] basedir=/usr/local/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< [mysqld] basedir=/usr/local/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< [mysqld] basedir=/usr/local/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< [mysqld] basedir=/usr/local/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< [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=/usr/local/mysql/bin/mysqld --defaults-file=/data/3307/my.cnf LimitNOFILE = 5000 EOF cat >/etc/systemd/system/mysqld3308.service< [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=/usr/local/mysql/bin/mysqld --defaults-file=/data/3308/my.cnf LimitNOFILE = 5000 EOF cat >/etc/systemd/system/mysqld3309.service< [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=/usr/local/mysql/bin/mysqld --defaults-file=/data/3309/my.cnf LimitNOFILE = 5000 EOF cat >/etc/systemd/system/mysqld3310.service< [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=/usr/local/mysql/bin/mysqld --defaults-file=/data/3310/my.cnf LimitNOFILE = 5000 EOF
1.4 准备DB02配置文件和启动脚本
cat >/data/3307/my.cnf< [mysqld] basedir=/usr/local/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< [mysqld] basedir=/usr/local/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< [mysqld] basedir=/usr/local/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< [mysqld] basedir=/usr/local/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< [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=/usr/local/mysql/bin/mysqld --defaults-file=/data/3307/my.cnf LimitNOFILE = 5000 EOF cat >/etc/systemd/system/mysqld3308.service< [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=/usr/local/mysql/bin/mysqld --defaults-file=/data/3308/my.cnf LimitNOFILE = 5000 EOF cat >/etc/systemd/system/mysqld3309.service< [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=/usr/local/mysql/bin/mysqld --defaults-file=/data/3309/my.cnf LimitNOFILE = 5000 EOF cat >/etc/systemd/system/mysqld3310.service< [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=/usr/local/mysql/bin/mysqld --defaults-file=/data/3310/my.cnf LimitNOFILE = 5000 EOF
1.5 修改权限,启动多实例
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'"
1.6 节点主从规划
箭头指向谁是主库
192.168.8.10:3307 <-----> 192.168.8.20:3307
192.168.8.10:3309 ------> 192.168.8.10:3307
192.168.8.20:3309 ------> 192.168.8.20:3307
192.168.8.20:3308 <-----> 192.168.8.10:3308
192.168.8.20:3310 -----> 192.168.8.20:3308
192.168.8.10:3310 -----> 192.168.8.10:3308
1.7 分片规划
shard1:
Master:192.168.8.10:3307
slave1:192.168.8.10:3309
Standby Master:192.168.8.20:3307
slave2:192.168.8.20:3309
shard2:
Master:192.168.8.20:3308
slave1:192.168.8.20:3310
Standby Master:192.168.8.10:3308
slave2:192.168.8.10:3310
1.8 开始配置
#第一组四节点结构
# 192.168.8.10:3307 <-----> 192.168.8.20:3307
## db02:
mysql -S /data/3307/mysql.sock -e "grant replication slave on *.* to repl@'192.168.8.%' identified by '123';" mysql -S /data/3307/mysql.sock -e "grant all on *.* to root@'192.168.8.%' identified by '123' with grant option;"
## db01:
mysql -S /data/3307/mysql.sock -e "CHANGE MASTER TO MASTER_HOST='192.168.8.20', 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='192.168.8.10', 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"
=======================
# 192.168.8.10:3309 ------> 192.168.8.10:3307
## db01:
mysql -S /data/3309/mysql.sock -e "CHANGE MASTER TO MASTER_HOST='192.168.8.10', 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"
# 192.168.8.20:3309 ------> 192.168.8.20:3307
## db02:
mysql -S /data/3309/mysql.sock -e "CHANGE MASTER TO MASTER_HOST='192.168.8.20', 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"
#第二组四节点
#192.168.8.20:3308 <-----> 192.168.8.10:3308
## db01:
mysql -S /data/3308/mysql.sock -e "grant replication slave on *.* to repl@'192.168.8%' identified by '123';" mysql -S /data/3308/mysql.sock -e "grant all on *.* to root@'192.168.8.%' identified by '123' with grant option;"
## db02:
mysql -S /data/3308/mysql.sock -e "CHANGE MASTER TO MASTER_HOST='192.168.8.10', 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='192.168.8.20', 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"
# 192.168.8.20:3310 -----> 192.168.8.20:3308
## db02:
mysql -S /data/3310/mysql.sock -e "CHANGE MASTER TO MASTER_HOST='192.168.8.20', 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"
# 192.168.8.10:3310 -----> 192.168.8.10:3308
## db01:
mysql -S /data/3310/mysql.sock -e "CHANGE MASTER TO MASTER_HOST='192.168.8.10', 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"
1.9 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,从第1.8步重新开始即可
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;"
==================================================================
2. MyCAT安装
2.1 预先安装Java运行环境
yum install -y java
2.2下载
2.3 解压文件
tar xf Mycat-server-1.6.7.1-release-20190627191042-linux.tar.gz -C /usr/local
2.4 软件目录结构
ls /usr/local/mycat
bin catlet conf lib logs version.txt
2.5 启动和连接
配置环境变量
vim /etc/profile
export PATH=/usr/local/mycat/bin:$PATH
保存退出
source /etc/profile
启动
vim /usr/local/mycat/conf/wrapper.conf
添加:
wrapper.startup.timeout=300
保存退出
mycat start
连接mycat:
mysql -uroot -p123456 -h 127.0.0.1 -P8066
3. 数据库分布式架构方式
3.1 垂直拆分
3.2 水平拆分
range
取模
枚举
hash
时间
等等
4. Mycat基础应用
4.1 主要配置文件介绍
rule.xml *****,分片策略定义
schema.xml *****,主配置文件
server.xml *** ,mycat服务有关,mycat管理员的账号和密码
log4j2.xml *** ,记录日志有关
*.txt ,分片策略使用的规则
4.2 用户创建及数据库导入
db01:
mysql -S /data/3307/mysql.sock grant all on *.* to root@'192.168.8.%' identified by '123'; source /root/world.sql mysql -S /data/3308/mysql.sock grant all on *.* to root@'192.168.8.%' identified by '123'; source /root/world.sql
4.3 配置文件结构介绍
cd /usr/local/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/">
mycat 逻辑库定义:
<schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="sh1"> </schema>
==================================================
数据节点定义:
<dataNode name="sh1" dataHost="laoli1" database= "world" />
==================================================
后端主机定义:
<dataHost name="laoli1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"> <heartbeat>select user()</heartbeat> <writeHost host="db1" url="192.168.8.10:3307" user="root" password="123"> <readHost host="db2" url="192.168.8.10:3309" user="root" password="123" /> </writeHost> </dataHost>
===================================================
文件结尾:
</mycat:schema>
4.4 mycat实现1主1从读写分离
vim schema.xml <!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="laoli1" database= "world" /> <dataHost name="laoli1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"> <heartbeat>select user()</heartbeat> <writeHost host="db1" url="192.168.8.10:3307" user="root" password="123"> <readHost host="db2" url="192.168.8.10:3309" user="root" password="123" /> </writeHost> </dataHost> </mycat:schema>
重启mycat:
mycat restart mysql -uroot -p123456 -h127.0.0.1 -P8066
4.5 Mycat高可用+读写分离
mv schema.xml schema.xml.1 vim schema.xml <!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="laoli1" database= "world" /> <dataHost name="laoli1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"> <heartbeat>select user()</heartbeat> <writeHost host="db1" url="192.168.8.10:3307" user="root" password="123"> <readHost host="db2" url="192.168.8.10:3309" user="root" password="123" /> </writeHost> <writeHost host="db3" url="192.168.8.20:3307" user="root" password="123"> <readHost host="db4" url="192.168.8.20:3309" user="root" password="123" /> </writeHost> </dataHost> </mycat:schema>
说明:
<writeHost host="db1" url="192.168.8.10:3307" user="root" password="123"> <readHost host="db2" url="192.168.8.10:3309" user="root" password="123" /> </writeHost> <writeHost host="db3" url="192.168.8.20:3307" user="root" password="123"> <readHost host="db4" url="192.168.8.20:3309" user="root" password="123" /> </writeHost>
第一个 whost: 192.168.8.10:3307 真正的写节点,负责写操作
第二个 whost: 192.168.8.20:3307 准备写节点,负责读,当 192.168.8.10:3307宕掉,会切换为真正的写节点
测试:
[root@db01 conf]# mysql -uroot -p123456 -h 192.168.8.10 -P 8066
读:
mysql> select @@server_id;
写:
mysql> begin ;select @@server_id; commit;
4.6 配置中的属性介绍:
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,重新启动后已切换后的为主,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
select user() : 监测心跳
5. Mycat高级应用-分布式解决方案
5.1 垂直分表
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="laoli1" database= "taobao" /> <dataNode name="sh2" dataHost="laoli2" database= "taobao" /> <dataHost name="laoli1" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"> <heartbeat>select user()</heartbeat> <writeHost host="db1" url="192.168.8.10:3307" user="root" password="123"> <readHost host="db2" url="192.168.8.10:3309" user="root" password="123" /> </writeHost> <writeHost host="db3" url="192.168.8.20:3307" user="root" password="123"> <readHost host="db4" url="192.168.8.20:3309" user="root" password="123" /> </writeHost> </dataHost> <dataHost name="laoli2" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" switchType="1"> <heartbeat>select user()</heartbeat> <writeHost host="db1" url="192.168.8.10:3308" user="root" password="123"> <readHost host="db2" url="192.168.8.10:3310" user="root" password="123" /> </writeHost> <writeHost host="db3" url="192.168.8.20:3308" user="root" password="123"> <readHost host="db4" url="192.168.8.20:3310" user="root" password="123" /> </writeHost> </dataHost> </mycat:schema>
创建测试库和表:
mysql -S /data/3307/mysql.sock -e "create database taobao charset utf8;" mysql -S /data/3308/mysql.sock -e "create database taobao charset utf8;" mysql -S /data/3307/mysql.sock -e "use taobao;create table user(id int,name varchar(20))"; 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 192.168.8.10 -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 ~]#
5.2 Mycat分布式-水平拆分(分片)介绍
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
5.3 Mycat分布式-范围分片
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
修改配置:
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="laoli1" database= "taobao" /> <dataNode name="sh2" dataHost="laoli2" 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 1-10=0 # -----> >=1 , <=10 10-20=1 # -----> >10 ,<=20
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 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');
分别登录后端节点查询数据
mysql -S /data/3307/mysql.sock -e "select * from taobao.t3;" mysql -S /data/3308/mysql.sock -e "select * from taobao.t3;"
5.4 取模分片(mod-long):
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
vim rule.xml
2
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 -h192.168.8.10 -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 -e "select * from taobao.t4;" mysql -S /data/3308/mysql.sock -e "select * from taobao.t4;"
5.5 枚举分片
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 -h127.0.0.1 -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');
分别登录后端节点查询数据
mysql -S /data/3307/mysql.sock -e "select * from taobao.t5;" mysql -S /data/3308/mysql.sock -e "select * from taobao.t5;"
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DBLE自己研究
<tableRule name="crc32slot"> <tableRule name="sharding-by-month">
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