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In this talk we examine the "before-image file", what it's for, how it works, and how you can configure it properly. You might get answers to questions that have been troubling people for over 25 * 10 -2 centuries: Why doesn't the before-image file have before-images ? Why aren't the data on disk ever current when the database is being used? What are checkpoints ? Why do we have them ? When your system crashes (and they all do eventually) how can the RDBMS recreate all the data that were lost in the crash and restore your database to a consistent state? 224_bi_checkpoints_crashes_v03.pdf
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