PHP Learning MySQL Courseware Advanced Chapter 1/2_PHP Tutorial

Responsibilities of database administrator
Server startup and shutdown
User account maintenance
Log file maintenance
Database backup and copy
Server optimization
Software update of database management system
Data Directory Security
Server Security
Disaster Recovery
Preventive Maintenance
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Startup and shutdown of the database
1. Startup of the database:
Method 1: Use the service command to start MySQL
# service mysqld start
// mysqld is the daemon process of MySQL. Start the MySQL service by running it.
Method 2: Use the mysqld script to start MySQL
# /etc/init.d/mysqld start
Method 3: Use the safe_mysqld utility to start the MySQL service. This method can use relevant parameters
# safe_mysqld&
Use the ampersand to run safe_mysqld in the background.
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Verify whether MySQL is started:
# service mysqld status
//Returns the following information, indicating that it has been started
mysqld (pid 1663) is running...
//1663 is the process number of mysqld running, which may vary according to the number of processes running on different systems
If you need to restart MySQL, you can use one of the following commands:
# service mysqld restart
# /etc/init.d/mysqld restart
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2. Shut down the database:
You can use one of the following commands:
# service mysqld stop
# /etc/init.d/mysqld stop
Account number'@'host' = old_password('password');
update mysql.user set password = old_password('password') where host = 'host' and user = 'account';
flush privileges;
Method 2:
mysqladmin password 'crq'

User password
For MySQL password, you can use the PASSWORD() and ENCRYPT() functions to encrypt
mysql>select PASSWORD("alex" );
“23fc96e064be0017”
Note: ENCRYPT() is not available on Windows

Method 3: Use the update statement and password() function to set the root password to crp.
mysql> update user set password=password('crq')
- -> where user='root';
//Returns the following information, indicating that the authorization table user has been successfully modified
Query OK, 2 row affected (0.09 sec)
Rows matched:2 changed:2 warnings: 0
Note: This method directly modifies the authorization table user, and the server will only load the authorization table when it starts. Permission settings, so you must use the flush privileges command in the client program mysql environment or use the flush-privileges subcommand of the management tool mysqladmin to notify the server to reload the authorization table.
mysql> flush privileges; //It will take effect at this time and can be used.
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Change the database storage path

Under Windows, all MySQL databases are saved in "%mysqlroor%data" directory.
Stop the MySQL service
Modify the %systemroor%my.ini file
[mysqld]
datadir=D:/data
Move all files and folder contents in the original directory to In the new directory D:/data directory.
Restart the MySQL service

Modify the MySQL character set
Find the MySQL configuration file my.ini, usually in C:windowmy.ini.
Add "default-character-set=gbk #" or gb2312, utf8 in the my.ini file
Restart the MySQL service

Delete anonymous users:
myslq> delete from user where user=' ';
//Returns the following information, indicating that the anonymous user was successfully deleted
Query OK, 2 row affected (0.03 sec)

Add new user permissions:
Use grant statement Used to grant user permissions,
Syntax:
GRANT priv_type[(column_list)][,priv_type[(column_list)]…]
ON {*.* | * | db_name.* | db_name.tabl_name | db_name}
TO user_name [IDENTIFIED BY 'password']
[,user_name [IDENTIFIED BY 'password']…]
[WITH GRANT OPTION]


Create new user
Specify the user name, the maximum allowed is 16 English characters
Specify the databases and tables that the user can access
Specify the operations that the user is allowed to do on the database
Specify which hosts the user is allowed to access from /IP for remote connection
Specify to allow this user to authorize or deauthorize other users

For example: add a super user crq that can connect to the MySQL server from the local host, but the password crqpass must be used when connecting.
mysql> grant all on *.* to crq@localhost identfied by 'crqpass' with grant option;
//Returns the following information, indicating that the permissions are set successfully
Query OK, 0 rows affected (0.02 sec)
For example: Use the same method to add a superuser crq that can connect to the MySQL server from anywhere else, but the password crqpass must be used when connecting.
mysql> grant all on *.* to crq@'%' identified by 'crqpass' with grant option;

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