How does Oracle instance recovery work and what happens internally?

Oracle expert Brian Peasland explains how an Oracle instance recovery works and what happens internally during the process in this tip.

What happens internally at the time of instance recovery?
The Oracle database must determine if there were transactions that were in-progress when the instance terminated. If there were, the instance uses information in the undo segments to rollback the transactions. Some transactions that were committed will have not yet been written to the database data files. So the instance recovery process will use the information in the online redo logs to write those changes to the data files.

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