How to understand that there is a connection pool problem? How does it manifest for an application?

Connection pool issues typically manifest as delays in executing database queries or errors related to exhaustion of available connections. For example, if the connection pool is exhausted, new requests will wait for a connection to be released, leading to increased application response times.

Signs of the problem:

• Frequent timeouts when trying to obtain a connection from the pool.
• Errors like "Timeout waiting for connection from pool".
• Increased response time when working with the database.
• High database load without a visible increase in the number of requests.

For diagnosis, check the pool settings (maximum number of connections, timeout), application logs, and pool usage metrics. It is also important to ensure that connections are properly closed after use to prevent leaks.