Q

How does SMON know to perform a crash recovery?

How does SMON determine that it has to perform a crash recovery?

How does SMON determine that it has to perform a crash recovery?
When the database is shut down normally, one of the last things that is done is to update the datafile headers and the control files with a final SCN, System Change Number. On startup, Oracle looks at all SCNs to see if they are the same. If one SCN is not identical to the rest, a crash must have occured, so SMON performs crash recovery, getting all datafiles up to the same final SCN before the database is opened.
This was last published in July 2006

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