前提
在CentOS上安装phpMyAdmin,你第一步需要架设一台Web服务器(如Apache或nginx),安装好MySQL/MariaDB数据库和PHP。根据你的偏好和需求,你可以从LAMP和LEMP中选择一种安装。
另一个要求是允许在你的CentOS上安装EPEL库。如果你还没设置过请猛戳这里。
在CentOS6或7上安装phpMyAdmin
一旦你设置了EPEL库,你就能轻松地用以下命令安装phpMyAdmin了。
在CentOS 7上:
$ sudo yum install phpmyadmin
在CentOS 7上:
$ sudo yum install phpmyadmin php-mcrypt
在CentOS 7上配置phpMyAdmin
默认情况下,CentOS 7上的phpMyAdmin只允许从回环地址(127.0.0.1)访问。为了能远程连接,你需要改动它的配置。
用文本编辑器打开phpMyAdmin的配置文件(路径:/etc/httpd/conf.d/phpMyAdmin.conf),找出并注释掉带有"Require ip XXXX"字样的代码行。会有四处这样的代码行,用"Require all granted"取而代之。重新改动过的配置文件如下所示。
$ sudo vi /etc/httpd/conf.d/phpMyAdmin.conf . . . . . <Directory /usr/share/phpMyAdmin/> AddDefaultCharset UTF-8 <IfModule mod_authz_core.c> # Apache 2.4 <RequireAny> #Require ip 127.0.0.1 #Require ip ::1 Require all granted </RequireAny> </IfModule> <IfModule !mod_authz_core.c> # Apache 2.2 Order Deny,Allow Deny from All Allow from 127.0.0.1 Allow from ::1 </IfModule> </Directory> <Directory /usr/share/phpMyAdmin/setup/> <IfModule mod_authz_core.c> # Apache 2.4 <RequireAny> #Require ip 127.0.0.1 #Require ip ::1 Require all granted </RequireAny> </IfModule> <IfModule !mod_authz_core.c> # Apache 2.2 Order Deny,Allow Deny from All Allow from 127.0.0.1 Allow from ::1 </IfModule> </Directory> . . . . .
最后,重启httpd使改动生效。
$ sudo systemctl restart httpd
在CentOS 6上配置phpMyAdmin
默认情况下,CentOS 6上的phpMyAdmin是禁止从每个IP地址访问的。为了能远程连接,你需要改动它的配置。
用文本编辑器打开phpMyAdmin的配置文件(路径:/etc/httpd/conf.d/phpMyAdmin.conf),找出并注释掉"Deny from all"字样的代码行。然后把"Allow from 127.0.0.1"字样的代码行改成"Allow from 0.0.0.0"。重新改动过的配置文件如下所示。
$ sudo vi /etc/httpd/conf.d/phpmyadmin.conf <Directory "/usr/share/phpmyadmin"> Order Deny,Allow # Deny from all Allow from 0.0.0.0 </Directory>
下一步是将phpMyAdmin的配置文件用blowfish加密工具加密。这一步需要加密cookie里的密码来作为基于cookie的部分认证。
用文本编辑器打开如下路径所示的文件并且用blowfish设置一个随机密码,如下所示。
$ sudo vi /usr/share/phpmyadmin/config.inc.php $cfg['blowfish_secret'] = 'kd5G}d33aXDc50!'; /* YOU MUST FILL IN THIS FOR COOKIE AUTH! */
最后,重启httpd使改动生效。
$ sudo service httpd restart
测试phpMyAdmin
测试phpMyAdmin是否设置成功,访问这个页面:http://

ACID attributes include atomicity, consistency, isolation and durability, and are the cornerstone of database design. 1. Atomicity ensures that the transaction is either completely successful or completely failed. 2. Consistency ensures that the database remains consistent before and after a transaction. 3. Isolation ensures that transactions do not interfere with each other. 4. Persistence ensures that data is permanently saved after transaction submission.

MySQL is not only a database management system (DBMS) but also closely related to programming languages. 1) As a DBMS, MySQL is used to store, organize and retrieve data, and optimizing indexes can improve query performance. 2) Combining SQL with programming languages, embedded in Python, using ORM tools such as SQLAlchemy can simplify operations. 3) Performance optimization includes indexing, querying, caching, library and table division and transaction management.

MySQL uses SQL commands to manage data. 1. Basic commands include SELECT, INSERT, UPDATE and DELETE. 2. Advanced usage involves JOIN, subquery and aggregate functions. 3. Common errors include syntax, logic and performance issues. 4. Optimization tips include using indexes, avoiding SELECT* and using LIMIT.

MySQL is an efficient relational database management system suitable for storing and managing data. Its advantages include high-performance queries, flexible transaction processing and rich data types. In practical applications, MySQL is often used in e-commerce platforms, social networks and content management systems, but attention should be paid to performance optimization, data security and scalability.

The relationship between SQL and MySQL is the relationship between standard languages and specific implementations. 1.SQL is a standard language used to manage and operate relational databases, allowing data addition, deletion, modification and query. 2.MySQL is a specific database management system that uses SQL as its operating language and provides efficient data storage and management.

InnoDB uses redologs and undologs to ensure data consistency and reliability. 1.redologs record data page modification to ensure crash recovery and transaction persistence. 2.undologs records the original data value and supports transaction rollback and MVCC.

Key metrics for EXPLAIN commands include type, key, rows, and Extra. 1) The type reflects the access type of the query. The higher the value, the higher the efficiency, such as const is better than ALL. 2) The key displays the index used, and NULL indicates no index. 3) rows estimates the number of scanned rows, affecting query performance. 4) Extra provides additional information, such as Usingfilesort prompts that it needs to be optimized.

Usingtemporary indicates that the need to create temporary tables in MySQL queries, which are commonly found in ORDERBY using DISTINCT, GROUPBY, or non-indexed columns. You can avoid the occurrence of indexes and rewrite queries and improve query performance. Specifically, when Usingtemporary appears in EXPLAIN output, it means that MySQL needs to create temporary tables to handle queries. This usually occurs when: 1) deduplication or grouping when using DISTINCT or GROUPBY; 2) sort when ORDERBY contains non-index columns; 3) use complex subquery or join operations. Optimization methods include: 1) ORDERBY and GROUPB


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