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What does SQL server do when bulk loading data into a Database in Simple mode.

Posted on 2011-03-15
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Can some one tell me what SQL server does when bulk loading data into a database that is in simple mode.

Such as file growth, table space growth etc. what about transactions how are they handled?
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Question by:Steve Samson
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Ryan McCauley earned 2000 total points
ID: 35148549
In SIMPLE recovery mode, only enough data is kept in the logs to properly roll back uncommitted transactions or roll forward transactions that committed but haven't been written to the data files yet - it's minimal.

During the bulk load, your table grows as a normal rate, but the log space used is minimal, as it's only enough to hold the currently uncommitted (or committed but unflushed) rows.

When you're bulk-loading data and your database is set to SIMPLE recovery mode, it's not itself wrapped in a transaction, so a failed bulk-load could leave half the data in your database. As I understand it, setting your recovery mode to BULK-LOAD will basically put it in SIMPLE mode, with the added benefit the bulk operations can also be rolled forward and backward as an atomic unit.
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