Can a service function correctly during a database connection failure?

The service can partially operate during a database connection failure, but its capabilities will be limited.

For example, if the service caches data or uses local storage, it can provide previously saved information. However, operations that require writing or retrieving current data from the database will be unavailable.

To ensure proper operation during failures, the following are typically used:

• Data caching
• Backup copies and database replication
• Error handling and fallback logic

Thus, a service usually cannot operate fully correctly without a database, but the impact of failures can be minimized.