MyCat分库分表--实战07--按日期天

项目环境：

192.168.8.30 mycat

192.168.8.31 node1

192.168.8.32 node2

192.168.8.33 node3

三个节点MySQL均为单实例

一、创建测试库

node1

create database testdb01;create database testdb02;create database testdb03;create database testdb04;create database testdb05;create database testdb06;create database testdb07;create database testdb08;create database testdb09;create database testdb10;create database testdb11;create database testdb12;

node2

create database testdb13;create database testdb14;create database testdb15;create database testdb16;create database testdb17;create database testdb18;create database testdb19;create database testdb20;create database testdb21;create database testdb22;create database testdb23;create database testdb24;

node3

create database testdb25;create database testdb26;create database testdb27;create database testdb28;create database testdb29;create database testdb30;create database testdb31;create database testdb32;create database testdb33;create database testdb34;create database testdb35;create database testdb36;

二、配置schema.xml

                                                                                                                                                                                                                                                                                                                                                                    select user()                                                                select user()                                                                select user()                                        

三、配置rule.xml

                                                adddate                        sharding-by-date                                yyyy-MM-dd                 2010-01-01                 2020-12-31                 120 

四、启动mycat

/usr/local/mycat/bin/mycat start

查看mycat日志

STATUS | wrapper  | 2018/11/22 19:03:02 | --> Wrapper Started as DaemonSTATUS | wrapper  | 2018/11/22 19:03:02 | Launching a JVM...INFO   | jvm 1    | 2018/11/22 19:03:02 | OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=64M; support was removed in 8.0INFO   | jvm 1    | 2018/11/22 19:03:04 | Wrapper (Version 3.2.3) http://wrapper.tanukisoftware.orgINFO   | jvm 1    | 2018/11/22 19:03:04 |   Copyright 1999-2006 Tanuki Software, Inc.  All Rights Reserved.INFO   | jvm 1    | 2018/11/22 19:03:04 | INFO   | jvm 1    | 2018/11/22 19:03:08 | MyCAT Server startup successfully. see logs in logs/mycat.log

五、登录MySQL查看逻辑表

mysql -uroot -pmysql -P8066 -h292.168.8.30

mysql> show databases;+----------+| DATABASE |+----------+| mycatdb  |+----------+1 row in set (0.02 sec)mysql> use mycatdb;Reading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -ADatabase changedmysql> show tables;+-------------------+| Tables in mycatdb |+-------------------+| user04            || user05            |+-------------------+2 rows in set (0.00 sec)mysql> drop table if exists user05;Query OK, 0 rows affected, 1 warning (0.57 sec)mysql> create table user05(    -> id int not null auto_increment,    -> name varchar(64),    -> adddate datetime,    -> primary key(id)    -> );Query OK, 0 rows affected (1.56 sec)

六、插入测试数据

插入10条记录

insert into user05(id,name,adddate) values(1,'steven','2011-05-09 12:32:12');insert into user05(id,name,adddate) values(2,'steven','2012-05-09 12:32:12');insert into user05(id,name,adddate) values(3,'steven','2013-05-09 12:32:12');insert into user05(id,name,adddate) values(4,'steven','2014-05-09 12:32:12');insert into user05(id,name,adddate) values(5,'steven','2015-05-09 12:32:12');insert into user05(id,name,adddate) values(6,'steven','2016-05-09 12:32:12');insert into user05(id,name,adddate) values(7,'steven','2017-05-09 12:32:12');insert into user05(id,name,adddate) values(8,'steven','2018-05-09 12:32:12');insert into user05(id,name,adddate) values(9,'steven','2019-05-09 12:32:12');insert into user05(id,name,adddate) values(10,'steven','2020-05-09 12:32:12');

七、验证数据

node1

mysql> select * from testdb01.user05;Empty set (0.00 sec)mysql> select * from testdb02.user05;Empty set (0.00 sec)mysql> select * from testdb04.user05;Empty set (0.00 sec)mysql> select * from testdb05.user05;+----+--------+---------------------+| id | name   | adddate             |+----+--------+---------------------+|  1 | steven | 2011-05-09 12:32:12 |+----+--------+---------------------+1 row in set (0.00 sec)mysql> select * from testdb06.user05;Empty set (0.01 sec)mysql> select * from testdb01.user05;Empty set (0.00 sec)mysql> select * from testdb02.user05;Empty set (0.00 sec)mysql> select * from testdb03.user05;Empty set (0.00 sec)mysql> select * from testdb04.user05;Empty set (0.00 sec)mysql> select * from testdb05.user05;+----+--------+---------------------+| id | name   | adddate             |+----+--------+---------------------+|  1 | steven | 2011-05-09 12:32:12 |+----+--------+---------------------+1 row in set (0.00 sec)mysql> select * from testdb06.user05;Empty set (0.01 sec)mysql> select * from testdb07.user05;Empty set (0.00 sec)mysql> select * from testdb08.user05;+----+--------+---------------------+| id | name   | adddate             |+----+--------+---------------------+|  2 | steven | 2012-05-09 12:32:12 |+----+--------+---------------------+1 row in set (0.00 sec)mysql> select * from testdb09.user05;Empty set (0.01 sec)mysql> select * from testdb10.user05;Empty set (0.00 sec)mysql> select * from testdb11.user05;+----+--------+---------------------+| id | name   | adddate             |+----+--------+---------------------+|  3 | steven | 2013-05-09 12:32:12 |+----+--------+---------------------+1 row in set (0.00 sec)mysql> select * from testdb12.user05;Empty set (0.00 sec)

node2

mysql> select * from testdb13.user05;Empty set (0.00 sec)mysql> select * from testdb14.user05;+----+--------+---------------------+| id | name   | adddate             |+----+--------+---------------------+|  4 | steven | 2014-05-09 12:32:12 |+----+--------+---------------------+1 row in set (0.00 sec)mysql> select * from testdb15.user05;Empty set (0.00 sec)mysql> select * from testdb16.user05;Empty set (0.00 sec)mysql> select * from testdb17.user05;+----+--------+---------------------+| id | name   | adddate             |+----+--------+---------------------+|  5 | steven | 2015-05-09 12:32:12 |+----+--------+---------------------+1 row in set (0.00 sec)mysql> select * from testdb18.user05;Empty set (0.00 sec)mysql> select * from testdb19.user05;Empty set (0.00 sec)mysql> select * from testdb20.user05;+----+--------+---------------------+| id | name   | adddate             |+----+--------+---------------------+|  6 | steven | 2016-05-09 12:32:12 |+----+--------+---------------------+1 row in set (0.00 sec)mysql> select * from testdb21.user05;Empty set (0.00 sec)mysql> select * from testdb22.user05;Empty set (0.00 sec)mysql> select * from testdb23.user05;+----+--------+---------------------+| id | name   | adddate             |+----+--------+---------------------+|  7 | steven | 2017-05-09 12:32:12 |+----+--------+---------------------+1 row in set (0.01 sec)mysql> select * from testdb24.user05;Empty set (0.00 sec)

node3

mysql> select * from testdb25.user05;Empty set (0.00 sec)mysql> select * from testdb26.user05;+----+--------+---------------------+| id | name   | adddate             |+----+--------+---------------------+|  8 | steven | 2018-05-09 12:32:12 |+----+--------+---------------------+1 row in set (0.00 sec)mysql> select * from testdb27.user05;Empty set (0.00 sec)mysql> select * from testdb28.user05;Empty set (0.00 sec)mysql> select * from testdb29.user05;+----+--------+---------------------+| id | name   | adddate             |+----+--------+---------------------+|  9 | steven | 2019-05-09 12:32:12 |+----+--------+---------------------+1 row in set (0.00 sec)mysql> select * from testdb30.user05;Empty set (0.00 sec)mysql> select * from testdb31.user05;Empty set (0.01 sec)mysql> select * from testdb32.user05;+----+--------+---------------------+| id | name   | adddate             |+----+--------+---------------------+| 10 | steven | 2020-05-09 12:32:12 |+----+--------+---------------------+1 row in set (0.00 sec)mysql> select * from testdb33.user05;Empty set (0.01 sec)mysql> select * from testdb34.user05;Empty set (0.00 sec)mysql> select * from testdb35.user05;Empty set (0.00 sec)mysql> select * from testdb36.user05;Empty set (0.01 sec)

可以看到10条测试数据按照120天一个分片，按顺序分布在各个数据库中，验证完毕。

遇到的问题：

第一次配置时候，在rule.xml中配置的90天一个分片，于是报错：

Caused by: io.mycat.config.util.ConfigException: Illegal table conf : table [ USER05 ] rule function [ sharding-by-date ] partition size : 45 > table datanode size : 36, please make sure table datanode size = function partition size

排查发现：从2011-01-01到2020-12-31大约4015天，4015/90=44.61111111111111个分片，超出了预设的36个库。

调整以后：4015/120=33.45833333333333个分片，在36个库范围之内。