: Confirm the database server is running and accepting remote connections. Check if a firewall is blocking the communication between the Cognos server and the database. Troubleshooting Steps
For older databases, you might need a legacy driver. Also ensure the driver class is loaded – most modern apps do this automatically, but in plain JDBC you need Class.forName("org.postgresql.Driver") . : Confirm the database server is running and
A: Intermittent failures point to network instability, connection pool exhaustion (connections not released), or the database server hitting resource limits (memory, CPU, file handles). Enable more logging and monitor during the failure window. Also ensure the driver class is loaded –
for detailed error stacks that can point to the specific JDBC driver exception. Validate Driver Location : Re-verify that the JDBC drivers are in the folder and not just the directory. database type for detailed error stacks that can point to