To recover a lost database connection, check your network, verify connection strings, and restart your database service if necessary.

Losing a database connection can disrupt your web app's functionality, but there are systematic steps you can take to recover it. Start by checking your network connectivity. Ensure that the server hosting your database is reachable and that no network issues are causing the disconnection. Use command-line tools like ping or traceroute to diagnose any connectivity problems. If the network is fine, verify your database connection strings. A common mistake is having incorrect credentials, hostnames, or port numbers in your connection string. Consult your database documentation to confirm the correct format and values. If you’re using an environment variable to store the connection string, make sure it is set correctly in your production environment. After checking the connection string, test your database service to ensure it is running properly. If your database is hosted on a separate server, log in to that server and check its status. If the database service has stopped or crashed, restart it and observe any error logs to understand the cause. Additionally, consider implementing connection pooling in your application, which helps manage and maintain multiple database connections efficiently, reducing the likelihood of connection loss. If the problem persists, review any recent changes in your application or server environment that may have impacted connectivity, and ensure that firewall settings are not blocking access to your database. By following these steps, you can effectively recover from a lost database connection and maintain your web app's stability.