The UNDO data persist after a rebound?

RDBMS version: 11.2, 10.2
Platform: Unix

Oracle will keep the Undo UNDO tablespace data after a rebound? If so, why oracle wants to keep data UNDO that existed prior to the stop? Is there a way to verify that the UNDO data is retained after the bounce?

Define 'bounce '.

Normal stop: all operations are finished, so no UNDO data is stored
Halt: all operations are finished, so no UNDO data is stored
Abandoned closing: UNDO data are preserved, like abort shutdown means "pull the plug." Starting Oracle will restore all uncommitted transactions using the UNDO tablespace.

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Sybrand Bakker
Senior Oracle DBA

Tags: Database

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