Database selection and configuration suggestions for building a web server on CentOS

Database selection and configuration recommendations for building a Web server on CentOS

Overview:
When building a Web server, database selection and configuration is a very important part. This article will introduce how to choose an appropriate database when building a web server on a CentOS system, and give corresponding configuration suggestions. At the same time, some code examples will also be provided to help readers better understand and operate.

Choose a database:
When selecting a database, you should decide based on your own needs and project characteristics. Common databases include MySQL, PostgreSQL, Oracle, etc. MySQL is a free open source relational database that is widely used in web development. PostgreSQL is a powerful open source object-relational database system used by many enterprise-level applications. Oracle is a commercial-grade database known for its high performance and reliability. Depending on the project size and performance needs, it is crucial to choose the database that suits you.

Configuration suggestions:
No matter which database you choose, you need to configure it accordingly. The following are configuration suggestions and code examples for building MySQL database and PostgreSQL database on CentOS systems.

1. MySQL database configuration:
   The MySQL configuration file is located in /etc/my.cnf. First, you need to modify the following parameters:

bind-address = 127.0.0.1 # Bind IP address, here set to the local loopback address
port = 3306 # Listening port, the default is 3306
max_connections = 500 # Maximum number of connections, configured according to project requirements
character_set_server = utf8 # The default character set is utf8

Restart the MySQL service to make the configuration take effect:

sudo systemctl restart mysqld

2. PostgreSQL Database configuration:
   The PostgreSQL configuration file is located in /var/lib/pgsql/data/postgresql.conf. The following are some commonly used configuration items:

listen_addresses = 'localhost' # Listening address, the default is localhost
port = 5432 # Listening port, the default is 5432
max_connections = 100 # Maximum Number of connections, configure according to project requirements
default_encoding = 'UTF8' # The default character set is UTF8

Restart the PostgreSQL service to make the configuration take effect:

sudo systemctl restart postgresql

Code example:
The following is Code examples for connecting MySQL and PostgreSQL databases in PHP:

1. Connecting to MySQL database:

$mysqli = new mysqli('localhost', 'username', 'password', 'database');
if ($mysqli->connect_errno) {
    die('连接失败：' . $mysqli->connect_error);
}
echo '连接成功！';
$mysqli->close();

2. Connecting to PostgreSQL database:

$pgconn = pg_connect("host=localhost port=5432 dbname=database user=username password=password") 
    or die('连接失败：' . pg_last_error());
echo '连接成功！';
pg_close($pgconn);

The above are some suggestions and code examples for selecting a database and configuring it accordingly when building a web server on a CentOS system. The specific configuration needs to be adjusted according to the actual situation. Choosing an appropriate database and configuring the database correctly have an important impact on the performance and stability of the Web server. I hope this article will be helpful to readers when setting up a web server.

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