mycat初次简单配置分库分表

先规划下数据库的基础架构，先来个最简单基础的。

三台虚机，各安装了mysql5.7
用mycat建立逻辑数据库，建立5个表格，其中一个表格分库，一个表格做全局表，剩余三个表格每个虚机的数据库各放一个。

统计信息：

三个虚机的IP分别为:
192.168.211.138
192.168.211.139
192.168.211.142

真实的dataNode就是这三个虚机啦。

mysql的登录用户就用[email protected]%，密码都是:[email protected]

mycat逻辑库的名字命名为:hello
五张表格：
t1,t2,t3,t4,t5
t1做分库，t2做全局，t3放到dn1,t4放到dn2,t5放到dn3

预先需要考虑的问题:

分库的规则是什么？

先开始做吧，到哪一步再来思考。

首先配置schema.xml文件

先把配置文件备份一下
[[email protected] conf]# cp schema.xml schema.xml.bk2

清空配置文件
[[email protected] conf]# echo " " > schema.xml

开始配置：
[[email protected] conf]# vi schema.xml
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/"> 这是定义文件头,xml格式默认必须有

<schema name="hello" checkSQLschema="false" sqlMaxLimit="100">    定义mycat逻辑库
                                       注释说明下面是分库表
        <table name="t1" dataNode="dn1,dn2,dn3" rule="auto-sharding-long" />    定义t1分库

注释说明是全局表
        <table name="t2" primaryKey="ID" type="global" dataNode="dn1,dn2,dn3" />       定义t2是全局表
<table name="t3" dataNode="dn1" />
<table name="t4" dataNode="dn2" />
<table name="t5" dataNode="dn3" />              这里还需要测试定义各个分别存放在哪里

</schema> 结束标签

<dataNode name="dn1" dataHost="mysql1" database="db1" />                  定义NODE
<dataNode name="dn2" dataHost="mysql2" database="db2" />
<dataNode name="dn3" dataHost="mysql3" database="db3" />
<dataHost name="mysql1" maxCon="1000" minCon="10" balance="0"                            定义后端连接的真实数据库
  writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
<heartbeat>select user()</heartbeat>

<writeHost host="hostM1" url="192.168.211.138:3306" user="root"
   password="[email protected]">

<readHost host="hostS2" url="192.168.211.138:3306" user="root" password="[email protected]"/>
</writeHost>
</dataHost>

<dataHost name="mysql2" maxCon="1000" minCon="10" balance="0"
                          writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
                <heartbeat>select user()</heartbeat>
                
                <writeHost host="hostM1" url="192.168.211.139:3306" user="root"
                                   password="[email protected]">
                 
<readHost host="hostS2" url="192.168.211.139:3306" user="root" password="[email protected]"/>
</writeHost>
</dataHost>

       <dataHost name="mysql3" maxCon="1000" minCon="10" balance="0"
                          writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
                <heartbeat>select user()</heartbeat>
                
                <writeHost host="hostM1" url="192.168.211.142:3306" user="root"
                                   password="[email protected]">
                 
<readHost host="hostS2" url="192.168.211.142:3306" user="root" password="[email protected]"/>
</writeHost>
</dataHost>

</mycat:schema> 结束标签

配置server.xml

<user name="root">
<property name="password">123456</property>
<property name="schemas">TESTDB</property> TESTDB改成自己的逻辑库，我的是hello

</user>

<user name="user">
                <property name="password">user</property>
                <property name="schemas">TESTDB</property>
                <property name="readOnly">true</property>
        </user>

启动服务 [[email protected] conf]# ../bin/mycat start
Starting Mycat-server...

登录看看 [[email protected] conf]# mysql -uroot -p123456 -P8066 -h 127.0.0.1

稍微等一下登录，我发现马上登录会报错，说登录不上去。可以执行：
[[email protected] conf]# ps -ef |grep mycat
看看进程启动没有

操作看看

我这边登录成功了，参考信息如下
登录有两个端口，9066是管理端口，可以查看监控信息，8066是普通数据库登录端口，下面我是用9066端口登录，检查信息

[[email protected] logs]# mysql -uroot -p123456 -P9066 -h 127.0.0.1
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.6.29-mycat-1.6-RELEASE-20161028204710 MyCat Server (OpenCloundDB)

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

以上是可以使用的监控命令，下面操作几个看看

mysql> show @@datanode;
+------+------------+-------+-------+--------+------+------+---------+------------+----------+---------+---------------+
| NAME | DATHOST    | INDEX | TYPE  | ACTIVE | IDLE | SIZE | EXECUTE | TOTAL_TIME | MAX_TIME | MAX_SQL | RECOVERY_TIME |
+------+------------+-------+-------+--------+------+------+---------+------------+----------+---------+---------------+
| dn1  | mysql1/db1 |     0 | mysql |      0 |   10 | 1000 |      94 |          0 |        0 |       0 |            -1 |
| dn2  | mysql2/db2 |     0 | mysql |      0 |   10 | 1000 |      92 |          0 |        0 |       0 |            -1 |
| dn3  | mysql3/db3 |     0 | mysql |      0 |   10 | 1000 |      94 |          0 |        0 |       0 |            -1 |
+------+------------+-------+-------+--------+------+------+---------+------------+----------+---------+---------------+
3 rows in set (0.01 sec)

三个datanode，正常。

[[email protected] logs]# mysql -uroot -p123456 -P8066 -h 127.0.0.1

普通口登录操作看看

mysql> show databases;
+----------+
| DATABASE |
+----------+
| hello |
+----------+
1 row in set (0.00 sec)

mysql>

mysql> show tables;
+-----------------+
| Tables in hello |
+-----------------+
| t1              |
| t2              |
| t3              |
| t4              |
| t5              |
+-----------------+
5 rows in set (0.00 sec)

mysql> desc t1;
ERROR 1146 (42S02): Table 'db1.t1' doesn't exist
mysql>
报错，因为实际我们还没有创建表格

mysql> create table t1(id int not null,name varchar(20));
Query OK, 0 rows affected (0.66 sec)

mysql>

mysql> explain create table t1(id int not null,name varchar(20));
+-----------+---------------------------------------------------+
| DATA_NODE | SQL                                               |
+-----------+---------------------------------------------------+
| dn1       | create table t1(id int not null,name varchar(20)) |
| dn2       | create table t1(id int not null,name varchar(20)) |
| dn3       | create table t1(id int not null,name varchar(20)) |
+-----------+---------------------------------------------------+
3 rows in set (0.04 sec)

注意t1分库，三个node都会生成

mysql> create table t2(id int not null,money varchar(100));
Query OK, 0 rows affected (0.12 sec)

mysql>

mysql> explain create table t2(id int not null,money varchar(100));
+-----------+-----------------------------------------------------+
| DATA_NODE | SQL                                                 |
+-----------+-----------------------------------------------------+
| dn1       | create table t2(id int not null,money varchar(100)) |
| dn2       | create table t2(id int not null,money varchar(100)) |
| dn3       | create table t2(id int not null,money varchar(100)) |
+-----------+-----------------------------------------------------+
3 rows in set (0.00 sec)

mysql>

注意t2全局表，三个node都会生成

mysql> create table t3(id int not null,bu varchar(20));
Query OK, 0 rows affected (0.04 sec)

mysql> desc t3;
+-------+-------------+------+-----+---------+-------+
| Field | Type        | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| id    | int(11)     | NO   |     | NULL    |       |
| bu    | varchar(20) | YES  |     | NULL    |       |
+-------+-------------+------+-----+---------+-------+
2 rows in set (0.13 sec)

mysql>

mysql> explain create table t3(id int not null,bu varchar(20));
+-----------+-------------------------------------------------+
| DATA_NODE | SQL |
+-----------+-------------------------------------------------+
| dn1 | create table t3(id int not null,bu varchar(20)) |
+-----------+-------------------------------------------------+
1 row in set (0.00 sec)

mysql>

t3，我们默认是设置放到node dn1上的，实现要求。

mysql> explain create table t4(id int not null,city varchar(10);
+-----------+--------------------------------------------------+
| DATA_NODE | SQL |
+-----------+--------------------------------------------------+
| dn2 | create table t4(id int not null,city varchar(10) |
+-----------+--------------------------------------------------+
1 row in set (0.00 sec)

mysql> explain  create table t5(id int not null,company varchar(50));
+-----------+------------------------------------------------------+
| DATA_NODE | SQL                                                  |
+-----------+------------------------------------------------------+
| dn3       | create table t5(id int not null,company varchar(50)) |
+-----------+------------------------------------------------------+
1 row in set (0.00 sec)

mysql>

t4放到node dn2
t5放到node dn3

达到了我们设计的要求。

原文地址：http://blog.51cto.com/goome/2058960

时间： 2024-11-06 14:09:31

mycat初次简单配置分库分表

mycat初次简单配置分库分表的相关文章

Mycat读写分离和分库分表配置

MyCat实现读写分离+分库分表+全局表

【MySQL】MySQL中针对大数据量常用技术_创建索引+缓存配置+分库分表+子查询优化（转载）

使用Mycat实现MySQL的分库分表、读写分离、主从切换

超简单理解分库分表

MyCat 读写分离数据库分库分表中间件安装部署，及简单使用

微服务、分库分表、分布式事务管理、APM链路跟踪性能分析演示项目

SpringBoot使用sharding-jdbc分库分表

MySQL 高可用：mysql+mycat实现数据库分片（分库分表）