ROLLBACK STATISTIC (TRANSACTION TABLES) NOTES:
  • Statistic Name - Name of the statistic
  • Value - Current value

  • The name of the consistent changes statistic is misleading. It does not indicate the number of updates (or changes), but rather, the number of times a consistent get had to retrieve and "old" version of a block because of updates that occurred after the cursor had been opened. As of Oracle7.3, a more accurate statistic was added. Named data blocks consistent reads - undo records applied; the new statistic gives the actual number of data records applied.
  • The consistent gets statistic reflects the number of accesses made to the block buffer to retrieve data in a consistent mode. Most accesses to the buffer are done with the consistent get mechanism, which uses the SCN (System Change Number) to make sure the data being read has not changed sine the query was started.
  • The data blocks consistent reads - undo records applied statistic reflects the number of updates (or changes) applied.