With respect to your second question about 'startup migrate,' this was introduced with Oracle 9.2 and basically starts up the instance in preparation for the upgrade or patch. Several 'alter system' commands are executed automatically upon startup (e.g., sets job_queue_processes to 0, enables restricted session, etc.). This is to prevent expected errors that occur during an upgrade or patch application from being returned to the session or sent to spool files. It is important that you restart your database normally after the upgrade or patch application has completed.
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