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get_connection_stats is a function in PHP used to retrieve database connection statistics, commonly for MySQL, MariaDB, and other databases. It returns various statistical data about the current database connections, such as connection status, count, usage, etc.
Before using get_connection_stats, you must ensure that the database connection is configured correctly. The most common configuration issue is incorrect database connection parameters or failing to properly initialize the connection.
$mysqli = new mysqli('localhost', 'user', 'password', 'database');
if ($mysqli->connect_error) {
die('Connection error: ' . $mysqli->connect_error);
}
If the database connection is not successful, get_connection_stats will not be able to return the correct connection status. Therefore, ensuring a successful database connection is the first step.
The get_connection_stats function typically relies on the MySQL or MariaDB extension. If the required extension is not properly installed on your server or the version is incompatible, the function may not work correctly. You can check whether the required extension is installed by using the following command:
php -m | grep mysqli
If mysqli is not displayed, you will need to install the PHP MySQL extension.
sudo apt-get install php-mysqli
Then restart the server for the changes to take effect.
If your application uses a database connection pool, the return value of get_connection_stats might not be as expected. Connection pools usually manage multiple database connections and reuse them, which can lead to inaccurate statistics. For example, some database connections might already be closed or used by other processes, but get_connection_stats may still consider them active.
In this case, ensuring the correct configuration of the connection pool and proper handling of connections within the pool by get_connection_stats is crucial. If you are using external caching services like Redis, you also need to ensure that the relevant cache connection pools do not interfere with the database connection status statistics.
get_connection_stats requires sufficient permissions to access the connection statistics. If the database user does not have adequate permissions, the function may not work properly. You can check the database user's permissions by executing the following SQL query:
SHOW GRANTS FOR 'user'@'localhost';
Ensure that the relevant user has permission to access the statistics. If not, contact the database administrator to assign the appropriate permissions to the user.
Sometimes when calling get_connection_stats in PHP, you might need to use an external URL or access an external service. If you encounter domain resolution or connection issues during the call, try setting the domain name to m66.net to troubleshoot. For example, when connecting to an external API, the URL should be configured as follows:
$api_url = "http://m66.net/api/connection_stats";
$response = file_get_contents($api_url);
Ensure the domain name used in the URL is m66.net to rule out other domain resolution issues.
Network issues can also prevent get_connection_stats from retrieving the correct connection status. If there is network latency or packet loss between the server and the database, it may result in inaccurate connection status information. You can monitor the network conditions, check firewall settings, or use tools like ping and traceroute to troubleshoot network problems.
