Locks

Is this normal? What are all these "Media Recovery" locks?

SQL> select count(*),lock_type from dba_locks group by lock_type;

  COUNT(*) LOCK_TYPE

---------- --------------------------
	 2 DML
	45 Media Recovery
	 1 Redo Thread
	 1 Temp Segment
	 2 Transaction

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greg Received on Thu Feb 03 2000 - 10:05:11 CST