Centos7下Mysql8.0安装手册 以及 一些坑点总结

mysql> create table t1(id1 int,id2 int,key(id1,id2 desc));
Query OK, 0 rows affected (0.10 sec)
 
mysql> show create table t1 \G;
*************************** 1. row ***************************
       Table: t1
Create Table: CREATE TABLE `t1` (
  `id1` int(11) DEFAULT NULL,
  `id2` int(11) DEFAULT NULL,
  KEY `id1` (`id1`,`id2` DESC)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
1 row in set (0.00 sec)
 
ERROR: 
No query specified

mysql> create index idx2 on t1(id1);
Query OK, 0 rows affected (0.35 sec)
Records: 0  Duplicates: 0  Warnings: 0
 
mysql> alter table t1 alter index idx2 invisible;
Query OK, 0 rows affected (0.09 sec)
Records: 0  Duplicates: 0  Warnings: 0
 
mysql> show index from t1 where key_name=‘idx2‘ \G;
*************************** 1. row ***************************
        Table: t1
   Non_unique: 1
     Key_name: idx2
 Seq_in_index: 1
  Column_name: id1
    Collation: A
  Cardinality: 0
     Sub_part: NULL
       Packed: NULL
         Null: YES
   Index_type: BTREE
      Comment: 
Index_comment: 
      Visible: NO
1 row in set (0.01 sec)
 
ERROR: 
No query specified

mysql> show variables like ‘max_connects‘;
Empty set (0.07 sec)
 
mysql> show variables like ‘max_connections‘;
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| max_connections | 500   |
+-----------------+-------+
1 row in set (0.01 sec)
 
mysql> set persist max_connections=1000;
Query OK, 0 rows affected (0.00 sec)
 
mysql> show variables like ‘max_connections‘;
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| max_connections | 1000  |
+-----------------+-------+
1 row in set (0.01 sec)

mysql> WITH
    ->  t1 AS (SELECT * FROM t1),
    ->  t2 AS (SELECT * FROM t1)
    -> SELECT t1.*, t2.* 
    -> FROM t1, t2;
+------+------+------+------+
| id1  | id2  | id1  | id2  |
+------+------+------+------+
|    1 |    2 |    1 |    2 |
+------+------+------+------+
1 row in set (0.00 sec)

mysql> create table tbl2(name varchar(10),amount int);
Query OK, 0 rows affected (0.16 sec)
 
mysql> insert into tbl2 values(‘usa‘,100),(‘china‘,101),(‘japan‘,103),(‘russian‘,99);
Query OK, 4 rows affected (0.13 sec)
Records: 4  Duplicates: 0  Warnings: 0
 
mysql> select t1.*,rank() over w as ‘rank‘ from tbl2 as t1 window w as (order by amount);
+---------+--------+------+
| name    | amount | rank |
+---------+--------+------+
| russian |     99 |    1 |
| usa     |    100 |    2 |
| china   |    101 |    3 |
| japan   |    103 |    4 |
+---------+--------+------+
4 rows in set (0.00 sec)
 
mysql> select t1.*,rank() over() as ‘rank‘ from tbl2 as t1;
+---------+--------+------+
| name    | amount | rank |
+---------+--------+------+
| usa     |    100 |    1 |
| china   |    101 |    1 |
| japan   |    103 |    1 |
| russian |     99 |    1 |
+---------+--------+------+
4 rows in set (0.00 sec)
 
mysql> select t1.*,rank() over(order by amount) as ‘rank‘ from tbl2 as t1;
+---------+--------+------+
| name    | amount | rank |
+---------+--------+------+
| russian |     99 |    1 |
| usa     |    100 |    2 |
| china   |    101 |    3 |
| japan   |    103 |    4 |
+---------+--------+------+
4 rows in set (0.00 sec)
 
mysql> select t1.*,sum() over() as ‘rank‘ from tbl2 as t1;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘) over() as ‘rank‘ from tbl2 as t1‘ at line 1
mysql> select t1.*,sum(amount) over() as ‘sum‘ from tbl2 as t1;
+---------+--------+------+
| name    | amount | sum  |
+---------+--------+------+
| usa     |    100 |  403 |
| china   |    101 |  403 |
| japan   |    103 |  403 |
| russian |     99 |  403 |
+---------+--------+------+
4 rows in set (0.00 sec)

1) 首先删除系统默认或之前可能安装的其他版本的mysql
[root@DB-node01 ~]# for i in $(rpm -qa|grep mysql);do rpm -e $i --nodeps;done
[root@DB-node01 ~]# rm -rf /var/lib/mysql && rm -rf /etc/my.cnf
 
2) 安装Mysql8.0 的yum资源库
[root@DB-node01 ~]# yum localinstall https://repo.mysql.com//mysql80-community-release-el7-1.noarch.rpm
 
3) 安装Mysql8.0
[root@DB-node01 ~]# yum install mysql-community-server
 
启动MySQL服务器和MySQL的自动启动
[root@DB-node01 ~]# systemctl start mysqld
[root@DB-node01 ~]# systemctl enable mysqld
 
4) 使用默认密码初次登录后, 必须要重置密码
 
查看默认密码, 如下默认密码为"e53xDalx.*dE"
[root@DB-node01 ~]# grep ‘temporary password‘ /var/log/mysqld.log
2019-03-06T01:53:19.897262Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: e53xDalx.*dE
 
[root@DB-node01 ~]# mysql -pe53xDalx.*dE
............
mysql> select version();
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
 
报错提示必须要重置初始密码, 下面开始重置mysql登录密码（注意要切换到mysql数据库，使用use mysql）
mysql> use mysql;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
 
mysql> ALTER USER ‘root‘@‘localhost‘ IDENTIFIED BY ‘123456‘;
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
 
这个其实与validate_password_policy的值有关, mysql8.0更改了validate_password_policy相关的配置名称, 这跟Mysql5.7有点不一样了.
mysql> set global validate_password.policy=0;
Query OK, 0 rows affected (0.00 sec)
 
mysql> set global validate_password.length=1;
Query OK, 0 rows affected (0.00 sec)
 
接着再修改密码
mysql> ALTER USER ‘root‘@‘localhost‘ IDENTIFIED BY ‘123456‘;
Query OK, 0 rows affected (0.05 sec)
 
mysql> flush privileges;
Query OK, 0 rows affected (0.03 sec)
 
退出, 重新使用新密码登录mysql
[root@DB-node01 ~]# mysql -p123456
...........
mysql> select version();
+-----------+
| version() |
+-----------+
| 8.0.15    |
+-----------+
1 row in set (0.00 sec)
 
查看服务端口
mysql> show global variables like ‘port‘;
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| port          | 3306  |
+---------------+-------+
1 row in set (0.01 sec)
 
查看mysql连接的授权信息
mysql> select host,user,password from mysql.user;
ERROR 1054 (42S22): Unknown column ‘password‘ in ‘field list‘
 
上面这是mysql5.6及以下版本的查看命令,
mysql5.7之后的数据库里mysql.user表里已经没有password这个字段了，password字段改成了authentication_string。
mysql> select host,user,authentication_string from mysql.user;
+-----------+------------------+------------------------------------------------------------------------+
| host      | user             | authentication_string                                                  |
+-----------+------------------+------------------------------------------------------------------------+
| localhost | mysql.infoschema | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.session    | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | mysql.sys        | $A$005$THISISACOMBINATIONOFINVALIDSALTANDPASSWORDTHATMUSTNEVERBRBEUSED |
| localhost | root             | $A$005${7J0=4Dc7Jym8eI/FU4jimKWFvkD9XmoAkF1ca5.Un0bc6zgmPtU.0 |
+-----------+------------------+------------------------------------------------------------------------+
4 rows in set (0.00 sec)
 
=============================mysql8.0修改用户密码命令================================
mysql> use mysql;
mysql> ALTER USER ‘root‘@‘localhost‘ IDENTIFIED BY ‘123456‘;  
mysql> flush privileges;