"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 220.127.116.11 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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