V$ROLLSTAT

This view contains rollback segment statistics.

Column	Datatype	Description
USN	NUMBER	Rollback segment number
EXTENTS	NUMBER	Number of extents in rollback segment
RSSIZE	NUMBER	Size in bytes of rollback segment. This values differs by the number of bytes in one database block from the value of the BYTES column of the ALL/DBA/USER_SEGMENTS views. See Also: Oracle9i Database Administrator's Guide.
WRITES	NUMBER	Number of bytes written to rollback segment
XACTS	NUMBER	Number of active transactions
GETS	NUMBER	Number of header gets
WAITS	NUMBER	Number of header waits
OPTSIZE	NUMBER	Optimal size of rollback segment
HWMSIZE	NUMBER	High water mark of rollback segment size
SHRINKS	NUMBER	Number of times the size of a rollback segment decreases
WRAPS	NUMBER	Number of times rollback segment is wrapped
EXTENDS	NUMBER	Number of times rollback segment size is extended
AVESHRINK	NUMBER	Average shrink size
AVEACTIVE	NUMBER	Current size of active extents, averaged over time.
STATUS	VARCHAR2(15)	Rollback segment status
CUREXT	NUMBER	Current extent
CURBLK	NUMBER	Current block