If the memory queue is full, where is additional data stored?

When the memory queue in Splunk reaches its capacity, additional data is redirected to the persistent queue. The persistent queue acts as a storage mechanism that retains data when the memory queue is overwhelmed; its design ensures that no data is lost during periods of high ingestion rates.

Utilizing the persistent queue is crucial for maintaining data integrity and availability, as it allows Splunk to temporarily offload excess data without dropping events. This capability is particularly important in environments where data inputs can vary significantly, ensuring that all incoming data is appropriately captured and processed.

In contrast, the other options do not accurately represent mechanisms for handling overflow from the memory queue. For example, the output queue is typically where data is written once it has been processed, and the error queue is used for managing events that couldn’t be processed correctly. A backup queue is not a standard term within Splunk architecture for managing data overflow. Thus, the persistent queue is the correct answer as it is specifically designed for this purpose.