What is the primary function of the log buffer in the HANA host?

The primary function of the log buffer in the HANA host is to record changes before they are committed to the database. This mechanism is crucial as it ensures data integrity and the ability to recover the database in the event of a failure. The log buffer temporarily holds these changes, allowing for efficient write operations and reducing the need for immediate commits to the disk, which can be resource-intensive. When a transaction is completed, the logged changes can be flushed to the permanent log files, maintaining a sequence that is essential for consistency and recovery processes.

In contrast, storing user data is handled by the main memory and disk storage areas, while session management pertains to how the database handles user connections and activities, which is separate from the logging functionality. Handling user authentication is processes related to verifying user identity and controlling access to the database, which also does not overlap with the role of the log buffer.