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A database session represents an application's dialog with a relational database. This chapter is a comprehensive reference for database sessions in TopLink. It describes the fundamental concepts required to connect to the database and to perform queries as well as optional and advanced session and query properties.
V$ACTIVE_SESSION_HISTORY displays sampled session activity in the database. It contains snapshots of active database sessions taken once a second. A database session is considered active if it was on the CPU or was waiting for an event that didn't belong to the Idle wait class.Refer to the V$EVENT_NAME view for more information on wait classes.This view contains one row for each active session per sample and returns the latest session sample rows first. A majority of the columns describing the session in the active session history are present in the V$SESSION view. majority of the columns describing the session in the active session history are present in the V$SESSION view.