👀 Views: 639 💬 Answers: 1 📅 Created: 2025-06-03

php mysql pdo performance PHP

I just started working with I'm stuck on something that should probably be simple. I'm working with a `Too many connections` behavior with my PHP application that's connecting to a MySQL database. This happens under heavy load, particularly when many users are accessing the site simultaneously. I'm using PHP 8.0 with MySQL 8.0 and the PDO extension for database interactions. I've already checked my MySQL configuration and increased the `max_connections` variable from the default 151 to 300, but the scenario continues. I currently have the following code for handling database connections: ```php try { $pdo = new PDO('mysql:host=localhost;dbname=my_database', 'username', 'password'); $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); } catch (PDOException $e) { echo 'Connection failed: ' . $e->getMessage(); } ``` Additionally, I'm using a persistent connection feature: ```php $pdo = new PDO('mysql:host=localhost;dbname=my_database', 'username', 'password', array( PDO::ATTR_PERSISTENT => true )); ``` I read that persistent connections can sometimes lead to resource exhaustion, which might be contributing to the scenario. I also implemented a connection pool using the `php-pdo-pool` library to optimize connection management. Despite these changes, during peak traffic times, I still see errors like: `SQLSTATE[HY000] [1040] Too many connections` What strategies can I employ to better manage database connections in this scenario? Are there specific best practices or configurations I might be missing? Any guidance would be greatly appreciated. I'm working on a API that needs to handle this. For reference, this is a production web app. Thanks in advance!