MySQL 8 测试

说 MySQL 8 的性能比 MySQL 5.7 性能提高了 2 倍，又，自己很久没用过 MySQL 了，于是想着试试

首先需要解决 CentOS 6 上安装的问题，看到这个文章， https://www.tecmint.com/instal…

这里介绍的是通过 yum 源的方式来安装的，但是这个方式不太行，内网的网络限制了，于是只能走预先下载 rpm 包的方式来了

一共需要这几个包：

mysql-community-server-8.0.13-1.el6.x86_64.rpm

mysql-community-client-8.0.13-1.el6.x86_64.rpm

mysql-community-common-8.0.13-1.el6.x86_64.rpm

mysql-community-libs-8.0.13-1.el6.x86_64.rpm

通过 rpm -ivh 来安装

rpm -ivh mysql-community-common-8.0.13-1.el6.x86_64.rpm
rpm -ivh mysql-community-libs-8.0.13-1.el6.x86_64.rpm
rpm -ivh mysql-community-client-8.0.13-1.el6.x86_64.rpm

安装到 client 的时候报错，说

Preparing...                ########################################### [100%]
	file /usr/bin/mysql from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-5.1.71-1.el6.x86_64
	file /usr/bin/mysqladmin from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-5.1.71-1.el6.x86_64
	file /usr/bin/mysqlbinlog from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-5.1.71-1.el6.x86_64
	file /usr/bin/mysqlcheck from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-5.1.71-1.el6.x86_64
	file /usr/bin/mysqldump from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-5.1.71-1.el6.x86_64
	file /usr/bin/mysqlimport from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-5.1.71-1.el6.x86_64
	file /usr/bin/mysqlshow from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-5.1.71-1.el6.x86_64
	file /usr/bin/mysqlslap from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-5.1.71-1.el6.x86_64
	file /usr/share/man/man1/mysql.1.gz from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-5.1.71-1.el6.x86_64
	file /usr/share/man/man1/mysqladmin.1.gz from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-5.1.71-1.el6.x86_64
	file /usr/share/man/man1/mysqldump.1.gz from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-5.1.71-1.el6.x86_64
	file /usr/share/man/man1/mysqlshow.1.gz from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-5.1.71-1.el6.x86_64
	file /usr/share/man/man1/mysqlslap.1.gz from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-5.1.71-1.el6.x86_64
	file /usr/share/man/man1/mysqlbinlog.1.gz from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-server-5.1.71-1.el6.x86_64
	file /usr/share/man/man1/mysqlcheck.1.gz from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-server-5.1.71-1.el6.x86_64
	file /usr/share/man/man1/mysqlimport.1.gz from install of mysql-community-client-8.0.13-1.el6.x86_64 conflicts with file from package mysql-server-5.1.71-1.el6.x86_64

感觉是要卸载掉机上旧的 MySQL 版本才行

yum -y remove mysql-5.1.71*
yum -y remove mysql-server-5.1.71*
yum -y remove mysql-libs-5.1.71*

又，每次执行 yum 总是试着连 aliyun 的源，但是又 Timeout，于是得把这个源干掉才行

[root@localhost etc]# mkdir yum-bak
[root@localhost etc]# mv yum.repos.d/* yum-bak/

最后安装 server

rpm -ivh mysql-community-server-8.0.13-1.el6.x86_64.rpm

装好了，就得启动起来

[root@localhost ~]# service mysqld start
Initializing MySQL database:                               [FAILED]

发现挂了。。。但是再试一次，就好了。。

[root@localhost ~]# service mysqld start
Starting mysqld:                                           [  OK  ]

然后要看下自动生成的临时密码

[root@localhost ~]# grep 'temporary password' /var/log/mysqld.log
2018-12-28T12:51:28.990464Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: drC&dCOp0tep

然后用 mysql_secure_installation 来进行一些安全的初始化，在这个过程中会要求你重置自己的 MySQL 密码

最终，终于能连上了

[root@localhost ~]#  mysql -u root -p
mysql> select version();
+-----------+
| version() |
+-----------+
| 8.0.13    |
+-----------+
1 row in set (0.00 sec)

然后新建用户

CREATE USER 'testuser'@'%' IDENTIFIED BY '123456@Test';
GRANT ALL ON *.* TO 'testuser'@'%';

但是连接的时候报错，需要重新指定一个简单的密码加密方式：

ALTER USER 'testuser'@'%' IDENTIFIED WITH mysql_native_password BY '123456@Test';

压测使用的是 sysbench-1.0.9-2.el6.x86_64.rpm