HW enqueue contention with LOB - AskDba.org WeblogDefinition Enqueues are local locks that serialize access to various resources. Enqueue wait event indicates a wait for a lock that is held by another session (or sessions) in an incompatible mode to the requested mode. HW Enqueue – High Watermark enqueue is acquired when a segment’s high water mark is moved, which will normally happen during a heavy insert operation on the segment. Detailed expla
