自己搭建mysql进行分表分库还是用阿里云的好
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当一张的数据达到几百万时,你查询一次所花的时间会变多,如果有联合查询的话,我想有可能会死在那儿了。分表的目的就在于此,减小数据库的负担,缩短查询时间。根据个人经验,mysql执行一个sql的过程如下:
1,接收到sql;2,把sql放到排队队列中 ;3,执行sql;4,返回执行结果。在这个执行过程中最花时间在什么地方呢?第一,是排队等待的时间,第二,sql的执行时间。其实这二个是一回事,等待的同时,肯定有sql在执行。所以我们要缩短sql的执行时间。
mysql中有一种机制是表锁定和行锁定,为什么要出现这种机制,是为了保证数据的完整 性,我举个例子来说吧,如果有二个sql都要修改同一张表的同一条数据,这个时候怎么办呢,是不是二个sql都可以同时修改这条数据呢?很显然mysql 对这种情况的处理是,一种是表锁定(myisam存储引擎),一个是行锁定(innodb存储引擎)。表锁定表示你们都不能对这张表进行操作,必须等我对 表操作完才行。行锁定也一样,别的sql必须等我对这条数据操作完了,才能对这条数据进行操作。如果数据太多,一次执行的时间太长,等待的时间就越长,这 也是我们为什么要分表的原因。 参考技术A
1、使用前,关掉防火墙,包括 selinux,firewalld,或者 MySQL 企业版的firewall(如果用了企业版的话)2、两台机器:(4 台 MySQL 实例)192.168.2.219 centos-ytt57-1 3311/3312192.168.2.229 centos-ytt57-2 3311/3312
3、安装 MySQL(两台都装), MySQL Shell(任意一台), mysqlrouter(任意一台,官方建议和应用程序装在一个服务器上)yum install mysql-community-server mysql-shell mysql-router-community
4、搭建 InnoDB-Cluster(两台都装)
1. 配置文件如下:shell>vi /etc/my.cnfmaster-info-repository=tablerelay-log-info-repository=tablegtid_mode=ONenforce_gtid_consistency=ONbinlog_checksum=NONElog_slave_updates=ONbinlog_format=ROWtransaction_write_set_extraction=XXHASH64
2. 系统 HOSTS 配置(两台都配)
shell>vi /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.2.219 centos-ytt57-2
192.168.2.229 centos-ytt57-3
用 MySQL coalesce 函数确认下 report-host 是否设置正确(root@localhost) : [(none)] >SELECT coalesce(@@report_host, @@hostname) as r;+----------------+| r |+----------------+| centos-ytt57-1 |+----------------+1 row in set (0.00 sec)
3. 创建管理员用户搭建 GROUP REPLICATION (四个节点都要)
create user root identified by 'Root@123';grant all on *.* to root with grant option;flush privileges;
4. MySQLsh 连接其中一台节点:
[root@centos-ytt57-1 mysql]# mysqlsh root@localhost:3321
5. 检查配置正确性:(如果这里不显示 OK,把对应的参数加到配置文件重启 MySQL 再次检查)dba.checkInstanceConfiguration("root@centos-ytt57-2:3311");dba.checkInstanceConfiguration("root@centos-ytt57-2:3312");dba.checkInstanceConfiguration("root@centos-ytt57-3:3311");dba.checkInstanceConfiguration("root@centos-ytt57-3:3312");mysqlsh 执行检测
[root@centos-ytt57-1 mysql]# mysqlsh --log-level=8 root@localhost:3311
MySQL localhost:3311 ssl JS > dba.checkInstanceConfiguration("root@centos-ytt57-2:3311")
"status": "ok"
6. 创建集群,节点 1 上创建。(结果显示 Cluster successfully created 表示成功)
MySQL localhost:3311 ssl JS > var cluster = dba.createCluster('ytt_mgr');
Cluster successfully created. Use Cluster.addInstance() to add MySQL instances.
At least 3 instances are needed for the cluster to be able to withstand up to
one server failure.
7. 添加节点 2,3,4(全部显示 OK,表示添加成功)MySQL localhost:3311 ssl JS > cluster.addInstance('root@centos-ytt57-2:3312');MySQL localhost:3311 ssl JS > cluster.addInstance('root@centos-ytt57-3:3311');MySQL localhost:3311 ssl JS > cluster.addInstance('root@centos-ytt57-3:3312');
8. 查看拓扑图:(describe 简单信息,status 详细描述)
MySQL localhost:3311 ssl JS > cluster.describe()
"clusterName": "ytt_mgr",
"defaultReplicaSet":
"name": "default",
"topology": [
"address": "centos-ytt57-2:3311",
"label": "centos-ytt57-2:3311",
"role": "HA",
"version": "8.0.17"
,
"address": "centos-ytt57-2:3312",
"label": "centos-ytt57-2:3312",
"role": "HA",
"version": "8.0.17"
,
"address": "centos-ytt57-3:3311",
"label": "centos-ytt57-3:3311",
"role": "HA",
"version": "8.0.17"
,
"address": "centos-ytt57-3:3312",
"label": "centos-ytt57-3:3312",
"role": "HA",
"version": "8.0.17"
],
"topologyMode": "Single-Primary"
MySQL localhost:3311 ssl JS > cluster.status()
"clusterName": "ytt_mgr",
"defaultReplicaSet":
"name": "default",
"primary": "centos-ytt57-2:3311",
"ssl": "REQUIRED",
"status": "OK",
"statusText": "Cluster is ONLINE and can tolerate up to ONE failure.",
"topology":
"centos-ytt57-2:3311":
"address": "centos-ytt57-2:3311",
"mode": "R/W",
"readReplicas": ,
"role": "HA",
"status": "ONLINE",
"version": "8.0.17"
,
"centos-ytt57-2:3312":
"address": "centos-ytt57-2:3312",
"mode": "R/O",
"readReplicas": ,
"role": "HA",
"status": "ONLINE",
"version": "8.0.17"
,
"centos-ytt57-3:3311":
"address": "centos-ytt57-3:3311",
"mode": "R/O",
"readReplicas": ,
"role": "HA",
"status": "ONLINE",
"version": "8.0.17"
,
"centos-ytt57-3:3312":
"address": "centos-ytt57-3:3312",
"mode": "R/O",
"readReplicas": ,
"role": "HA",
"status": "ONLINE",
"version": "8.0.17"
,
"topologyMode": "Single-Primary"
,
"groupInformationSourceMember": "centos-ytt57-2:3311"
9. 简单测试下数据是否同步
(root@localhost) : [(none)] >create database ytt;
Query OK, 1 row affected (0.03 sec)
(root@localhost) : [(none)] >use ytt;
Database changed
(root@localhost) : [ytt] >create table p1(id int primary key, log_time datetime);
Query OK, 0 rows affected (0.08 sec)
(root@localhost) : [ytt] >insert into p1 values (1,now());
Query OK, 1 row affected (0.04 sec)
(root@localhost) : [ytt] >show master status;
+---------------+----------+--------------+------------------+-------------------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------------------------------+
| mysql0.000001 | 25496 | | | 6c7bb9db-b759-11e9-a9c0-0800276cf0fc:1-41 |
+---------------+----------+--------------+------------------+-------------------------------------------+
1 row in set (0.00 sec)
查看其他三个节点
(root@localhost) : [ytt] >show tables;
+---------------+
| Tables_in_ytt |
+---------------+
| p1 |
+---------------+
1 row in set (0.00 sec)
(root@localhost) : [ytt] >select * from p1;
+----+---------------------+
| id | log_time |
+----+---------------------+
| 1 | 2019-08-05 16:44:20 |
+----+---------------------+
1 row in set (0.00 sec)
停掉主节点:[root@centos-ytt57-2 mysql0]# systemctl stop mysqld@0
现在查看,主节点已经变为本机 3312节点"centos-ytt57-2:3312": "address": "centos-ytt57-2:3312", "mode": "R/W", "readReplicas": , "role": "HA", "status": "ONLINE"
10. 报错处理
错误日志里显示2019-08-05T09:01:35.125591Z 0 [ERROR] Plugin group_replication reported: 'The group name option is mandatory'2019-08-05T09:01:35.125622Z 0 [ERROR] Plugin group_replication reported: 'Unable to start Group Replication on boot'
同时用 cluster.rescan() 扫描,发现The instance 'centos-ytt57-2:3311' is no longer part of the ReplicaSet.
重新加入此节点到集群:cluster.rejoinInstance('centos-ytt57-2:3311')
再次执行cluster.status()查看集群状态:"status": "OK",11. 移除和加入cluster.removeInstance("centos-ytt57-3:3312");The instance 'centos-ytt57-3:3312' was successfully removed from the cluster.cluster.addInstance("centos-ytt57-3:3312");The instance 'centos-ytt57-3:3312' was successfully added to the cluster.
12. 用 mysqlrouter 生成连接 MGR 相关信息。涉及到两个用户:--user=mysqlrouter 是使用mysqlrouter的系统用户自动创建的MySQL 用户是用来与MGR通信的用户。如果想查看这个用户的用户名以及密码,就加上--force-password-validation,不过一般也没有必要查看。
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