Which three operations require undo data?

Which three operations require undo data? (Choose three.)

Which three operations require undo data? (Choose three.)

A.
Committing a transaction

B.
Flashing back a transaction

C.
Recovering a failed transaction

D.
Running a read-consistent query

E.
Changing atablespace status from READ ONLY to READ WRITE

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Leloush

Leloush

BCD
Undo records are used to:
Roll back transactions when a ROLLBACK statement is issued
Recover the database
Provide read consistency
Analyze data as of an earlier point in time by using Oracle Flashback Query
Recover from logical corruptions using Oracle Flashback features

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