Hang Manager is an Oracle Real Application Clusters (Oracle RAC) environment feature that autonomously resolves delays and keeps the resources available.

Enabled by default, Hang Manager:

• Reliably detects database delays and deadlocks
• Autonomously resolves database delays and deadlocks
• Logs all detections and resolutions
• Provides SQL interface to configure sensitivity (Normal/High) and trace file sizes

A database delays when a session blocks a chain of one or more sessions. The blocking session holds a resource such as a lock or latch that prevents the blocked sessions from progressing. The chain of sessions has a root or a final blocker session, which blocks all the other sessions in the chain. Hang Manager resolves these issues autonomously by detecting and resolving the delays.