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The two general classes of operators are : unary : A unary operator is an operator that operates on only one operand. Here is the format : operator operand. Example: +2460, -300 . binary : An operator is referred to as binary if it operates on two operands. Here is the format :
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.t 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.