MySQL8.0初体验
MySQL8.0的官方社区开源版出来有段时间了，而percona的8.0版本还没有正式对外发布（已发布测试版），一直以来也没安装体验下这个号称质的飞跃的版本，今天正好有些时间就下了安装体验体验。
一、MySQL8.0下载
下载地址：https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.13-linux-glibc2.12-x86_64.tar.xz
二、安装环境
| 软件名称 | 软件版本 | 备注 |
| 操作系统 | RHEL6.6_X86_64 | |
| 数据库 | MySQL8.0.13 |
三、MySQL8.0安装
官方参考：https://dev.mysql.com/doc/refman/8.0/en/binary-installation.html
1.软件下载
[root@node tools]# wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.13-linux-glibc2.12-x86_64.tar.xz
2.依赖包安装
[root@node mysql]# yum search libaio
[root@node mysql]# yum install libaio
3.用户创建
[root@node mysql]# groupadd mysql
[root@node mysql]# useradd -r -g mysql -s /bin/false mysql
4.解压缩安装包
[root@node mysql]# cd /usr/local
[root@node mysql]# tar -xvf mysql-8.0.13-linux-glibc2.12-x86_64.tar.xz
5.规划软件和数据文件目录
[root@node tools]# mv mysql-8.0.13-linux-glibc2.12-x86_64 /usr/local/mysql
[root@node mysql]# cd /usr/local/mysql
[root@node mysql]# mkdir -p /data/mysql/data
6.修改属主权限
[root@node mysql]# chown -R mysql:mysql /data/mysql/data
[root@node mysql]# chmod -R 750 /data/mysql/data
7.数据库初始化
[root@node mysql]# bin/mysqld --initialize --user=mysql --datadir=/data/mysql/data
2018-11-12T02:49:23.293863Z 0 [System] [MY-013169] [Server] /usr/local/mysql/bin/mysqld (mysqld 8.0.13) initializing of server in progress as process 24839
2018-11-12T02:49:26.840424Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: Vxxx1n%Mj7uZ
2018-11-12T02:49:29.671663Z 0 [System] [MY-013170] [Server] /usr/local/mysql/bin/mysqld (mysqld 8.0.13) initializing of server has completed
8.ssl部署
[root@node mysql]# bin/mysql_ssl_rsa_setup
Generating a 2048 bit RSA private key
.......+++
............................+++
writing new private key to 'ca-key.pem'
-----
Generating a 2048 bit RSA private key
...........................................+++
..+++
writing new private key to 'server-key.pem'
-----
Generating a 2048 bit RSA private key
..................................................................+++
...................+++
writing new private key to 'client-key.pem'
-----
9.启动数据库
[root@node mysql]# bin/mysqld_safe --user=mysql --datadir=/data/mysql/data &
[1] 25195
[root@node mysql]# Logging to '/data/mysql/data/node.err'.
2018-11-12T02:51:59.390239Z mysqld_safe Starting mysqld daemon with databases from /data/mysql/data
10.连接数据库
[root@node mysql]# mysql -uroot -p'Vjk01n%Mj7uZ' -hlocalhost
mysql> select user,host from mysql.user;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
11.修改数据库初始密码
mysql> alter user root@'localhost' identified by 'xxxx';
Query OK, 0 rows affected (0.07 sec)
12.数据库查询
mysql> select user,host from mysql.user;
+------------------+-----------+
| user | host |
+------------------+-----------+
| mysql.infoschema | localhost |
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
+------------------+-----------+
4 rows in set (0.00 sec)
13.MySQL启动服务配置
[root@node mysql]# cp -rp support-files/mysql.server /etc/init.d/mysqld
[root@node data]# chkconfig --add mysqld
[root@node mysql]# vi /etc/my.cnf
[root@node ~]# vi /root/.bash_profile
PATH=$PATH:$HOME/bin:/usr/local/sysbench/bin:/usr/local/mysql/bin/
[root@node ~]# source ~/.bash_profile
14.杀掉MySQL进程，通过service服务重启数据库
[root@node data]# service mysqld start
Starting MySQL.................. [ OK ]
至此MySQL8.0二进制包数据库安装完毕，开始体验其功能。
四、MySQL8.0功能体验
https://www.mysql.com/why-mysql/white-papers/whats-new-mysql-8-0/
MySQL8.0号称快于5.7历史版本2倍的速度（MySQL 8.0: Up to 2x Faster）
1.数据字典innodb表
2.密码加密方式更改
3.默认字符集utf8mb4
4.json功能加强
5.SQL功能加强
6.窗口函数
7.隐藏索引
8.降序索引
9.查询一致性改善
10.优化直方图
