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How to Disable Parallel Transaction Recovery When Parallel Txn Recovery is Active (Doc ID 238507.1)

Last updated on SEPTEMBER 09, 2021

Applies to:

Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.

Symptoms



Parallel Transaction Recovery is taking too long.

You can use V$TRANSACTION USED_UBLK to estimate how long the rollback is going
to take but there is no formula for this.  If you shutdown the database after
rollback has started, it will begin where it left off.  

You can also look at V$FAST_START_TRANSACTIONS for UNDOBLOCKSDONE
versus UNDOBLOCKSTOTAL.

Changes

 A large transaction got killed or rolled back.

Cause

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