What's the impact of increasing the frequency of the Periodic Refresh process for Adaptive Search in Sales?

The Periodic Refresh indexing process is set to run every hour. You can increase the frequency without impacting performance. However, how frequently you can run the process depends on the volume of your data. If you run the process every 5 minutes, for example, and it takes the process more than 5 minutes to process the new records, the process will prevent the next one from running.