Active Session History (ASH)

Active Session History (ASH) is a feature used in database management to monitor and analyze ongoing activity within the system. It records snapshots of current user sessions and their actions at frequent intervals, providing a detailed log of what users are doing in real-time. This helps database administrators identify performance issues, understand workload patterns, and troubleshoot problems efficiently. Think of ASH as a continuous, detailed surveillance camera that captures real-time activities, offering insights into system behavior without significant performance impact.