photoshop learning website PHP learning mysql courseware advanced page 1/2

Responsibilities of the database administrator
Server startup and shutdown
User account maintenance
Log file maintenance
Database backup and copy
Server optimization
Database management system software update
Data directory security
Server security
Disaster recovery
Preventive maintenance
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Starting and closing the database
1. Starting 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 & symbol to put safe_mysqld in the background run.
``````````````````````````````````````````` `` `` `` `` `` Check whether mysql has been started:
#Service MySQLD Status
// Return to the following information, indicating that I have started
mysqld (pid 1663) is running ...
// 1663 is mysqld The running process number may vary depending on 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
# /mysqladmin shutdown
MySQL management
Change the root management password
Method 1 :
mysql>set password for 'account'@'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 modified successfully
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 permission settings in the authorization table when it starts, so the client program mysql must be used 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 the "%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 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=' ';
//Return the following information , indicating that the anonymous user was successfully deleted
Query OK, 2 row affected (0.03 sec)
Add new user permissions:
Use the grant statement to grant user permissions,
Syntax:
GRANT priv_type[(column_list)][,priv_type[( column_list)]…]
ON {*.* | [WITH GRANT OPTION]
Create a new user
Specify a 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 to 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;
//Return 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 query from any other Superuser crq to connect to the MySQL server, 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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