[大数据]2021120501_mysql中文乱码以及修改用户密码

目录

1、centos6.5安装mysql,存储中文数据库里面乱码都是????

2、修改用户密码

?3、service mysql stop/start出现 Mysql server PID file cloud net be found

1、centos6.5安装mysql,存储中文数据库里面乱码都是????

?数据库版本：

mysql> select version();
+-----------+
| version() |
+-----------+
| 5.6.22    |
+-----------+
1 row in set (0.00 sec)

?查看数据库字符集：

mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> show variables like 'character%';
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | latin1                     |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | latin1                     |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)

修改mysql字符集:修改my.cnf配置文件

[mysqld]

# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M

# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin

# These are commonly set, remove the # and set as required.
# basedir = .....
# datadir = .....
# port = .....
# server_id = .....
# socket = .....

# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M 
#skip-grant-tables

character-set-server = utf8
#default-character-set = utf8
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES 

[mysqld_safe]
#default-character-set = utf8
character-set-server = utf8

[client]
#default-character-set = utf8
character-set-server = utf8

[mysql.server]
#default-character-set = utf8
character-set-server = utf8

[mysql]
#default-character-set = utf8
character-set-server = utf8

配置default-character-set会出现PID not found。Mysql5.6需要配置character-set-server。5.1可以用原来的。

重启：

# 第一种
service mysql quit/stop
service mysql start

# 第二种
service mysql restart

2、修改用户密码

在my.cnf配置文件中配置3

skip-grant-tables

配置文件修改后，重启一下mysql然后执行mysql就不需要账户密码了,再进行重新设置账户密码

按照以下步骤即可，然后再把配置文件配置skip-grant-tables注释掉。

?3、service mysql stop/start出现 Mysql server PID file cloud net be found

?解决办法：可能有正在运行的mysql进程，需要杀死后在进行停止或者重新启动

// 查看进程中是否有mysql进行在运行
ps -eg | grep mysql

// 强制杀死进程
kill -9 进程号