Oracle Exam 1Z0-063 Topic 8 Question 28 Discussion

Actual exam question for Oracle's 1Z0-063 exam

Question #: 28
Topic #: 8

[All 1Z0-063 Questions]

Which three statements are true about the database instance startup after an instance failure? (Choose three.)

AThe RECO process recovers the uncommitted transactions at the next instance startup.

BOnline redo log files and archived redo log files are required to complete the rollback stage of instance recovery.

CUncommitted changes are rolled back to ensure transactional consistency.

DThe SMON process coordinates the database recovery.

EMedia recovery is required to complete the database recovery.

FChanges committed before the failure, which were not written to the data files, are re-applied.

Show Suggested Answer

Suggested Answer: A, C, D

A: Occasionally a database closes abnormally with one or more distributed transactions in doubt (neither committed nor rolled back). When you reopen the database and recovery is complete, the RECO background process automatically, immediately, and consistently resolves any in-doubt distributed transactions.

C: Crash and instance recovery involve two distinct operations: rolling forward the current, online datafiles by applying both committed and uncommitted transactions contained in online redo records, and then rolling back changes made in uncommitted transactions to their original state.

D: The SMON background process performs instance recovery, applying online redo automatically. No user intervention is required.

References:

https://docs.oracle.com/cd/B28359_01/server.111/b28318/startup.htm

https://docs.oracle.com/database/121/CNCPT/startup.htm

by Sherita at May 04, 2022, 07:46 AM

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