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A Transact-SQL statement that terminates an Oracle connection. Any outstanding transactions for the selected session are rolled back and all locks are released.
Least Recently Used. An algorithm used by Oracle for making room for new information in the memory space allocated, by replacing the oldest (least recently used) data.
Log Sequence Number. This number, which uniquely identifies a point in a database's Log, is used for determining when a page was last modified.
Latch wait events occur when a session needs to acquire a latch that is held by another session. Latches are simple, low-level serialization mechanisms to protect shared SGA data structures and shared code segments from simultaneous session access. They are similar in purpose to locks: latches protect internal memory structures while locks protect data structures. Latch wait events are designed to be very quickly acquired and freed.
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