Connection problems are often the first challenge after deploying GBase Database.
A failed connection does not always mean the database is down. The problem can come from the server, network, authentication configuration, client settings, or the target database.
This guide provides a practical troubleshooting framework for common GBase Database connection issues without tying the process to a specific deployment environment.
1. Cannot Connect to the Database Server
A typical application may report an error such as:
Cannot connect to database server
Connection refused
Server is unavailable
Start with the simplest question:
Is the GBase Database server running and accepting connections?
Check the database instance status using the administration tools available in your environment. If the instance is not running, review the server logs and startup configuration before attempting to restart it.
If the instance is running, move to the network layer.
Check:
- Server hostname or IP address
- Database service or port
- Firewall rules
- Client/server connectivity
- Database server aliases and connection configuration
A common mistake is to immediately modify database configuration when the actual problem is simply an incorrect hostname or blocked port.
2. Authentication Failed
Authentication errors usually look like:
Authentication failed
Incorrect username or password
Access denied
Before resetting credentials, verify the complete authentication path.
Check:
- The username exists.
- The password is correct.
- The user has access to the target database.
- The authentication method matches the client configuration.
- The client is connecting to the expected GBase Database instance.
For production environments, also check whether password policies, account expiration, or external authentication mechanisms are involved.
The key is to distinguish authentication failure from connection failure.
If the client cannot reach the server, changing the password will not solve the problem.
3. Database Server Is Running, but the Database Cannot Be Opened
Another common situation is that the GBase Database instance is available, but a specific database cannot be accessed.
Possible causes include:
- The database does not exist.
- The database is not currently available.
- The connection is using the wrong database name.
- The user does not have sufficient privileges.
- The database encountered an operational or recovery issue.
First verify the database name and availability.
Do not immediately recreate the database. If the database contains production data, determine why it is unavailable before making any destructive changes.
This distinction is important:
A database connection problem is not automatically a database recovery problem.
4. Client Configuration Problems
Sometimes the server is healthy and authentication works, but the application still cannot connect.
In this situation, compare the client configuration with the server configuration.
Pay attention to:
- Hostname
- Port or service name
- Database name
- Username
- Connection protocol
- Driver version
- Connection string parameters
This is particularly important during GBase Database migration projects.
An application may continue using connection parameters from the source Oracle, MySQL, or PostgreSQL environment even after the database has been migrated.
A Simple Troubleshooting Flow
When troubleshooting a GBase Database connection issue, work from the outside in:
Client
↓
Network
↓
Database Server
↓
Authentication
↓
Target Database
↓
Application
Test one layer at a time.
For example, if the server cannot be reached, there is no reason to investigate SQL permissions yet. If authentication succeeds but the application fails, focus on the connection pool, driver, or application configuration.
What to Collect Before Escalation
When a GBase Database connection issue cannot be resolved quickly, collect:
- Exact error message
- Client type and version
- GBase Database version
- Server operating system
- Connection parameters, excluding passwords
- Whether other clients can connect
- Database server logs
- Approximate time when the problem occurred
This information can significantly reduce troubleshooting time.
Final Takeaway
Most GBase Database connection problems fall into a small number of categories:
Server status, network connectivity, authentication, database availability, or client configuration.
Instead of changing multiple settings at once, isolate these layers one by one.
This approach makes GBase Database troubleshooting safer, faster, and easier to reproduce across development, testing, and production environments.
