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Question: Which background process and associated database component guarantees that committed data is saved even when the changes have not been recorded in the data files?

Answer: LGWR (log writer) and online redo log files. The log writer process writes data to the buffers when a transaction is committed. LGWR writes to the redo log files in the order of events (sequential order) in case of a failure

LGWR (log writer) and online redo log files. The log writer process writes data to the buffers when a transaction is committed. LGWR writes to the redo log files in the order of events (sequential order) in case of a failure Source: CoolInterview.com

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