V$ROLLSTAT

This view contains rollback segments statistics.

Fields

The most relevant view fields are as follows:

  • USN: The rollback segment number
  • LATCH: The latch for the rollback segment
  • EXTENTS: The number of extents in the rollback segment
  • RSSIZE: The size of the rollback segment in bytes
  • WRITES: The number of bytes written to the rollback segment
  • XACTS: The number of active transactions
  • GETS The number of header gets
  • WAITS: The number of header waits
  • STATUS: The rollback segment status, it can be ONLINE, OFFLINE, PENDING OFFLINE, or FULL

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