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"Undo Segment Recovery Wait" seen in AWR. What to check ? (Doc ID 1629386.1)

Last updated on DECEMBER 30, 2019

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.


"Undo segment recovery" wait event is being reported in the AWR report as one of the Top 5 Timed Foreground Events

Event Waits Time(s) Avg wait (ms) % DB time Wait Class

undo segment recovery 2,524 7,554 2993 30.51 Other  <<<<-----------------------
DB CPU   6,062   24.48
log file sync 1,307,448 3,704 3 14.96 Commit
db file sequential read 498,847 3,351 7 13.53 User I/O
db file parallel read 68,924 195 3 0.79 User I/O



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