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Understanding SMON

Can you explain what SMON does after/during crash recovery?
When a crash occurs, the Buffer Cache will contain data that has not changed, data that has changed but been committed, and data that has changed but not been committed. For the data that has changed and been committed, that committed change may or may not have been written to the datafiles.

When you start the database after a crash, SMON is responsible for recovering the database. For data that was changed SMON determines if it has been committed or not. If it has been committed, SMON determines if the change was written to disk or not. If the committed change was not written to disk, SMON writes that change to the datafile on recovery. SMON uses the information in the online redo log files to determine what changes were committed or not.

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