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Why does my transaction-log fill up when I use fast-bcp, select into or the transfer tool?. I thought this didn't log anything.

Fast BCP and select into do not log record updates. However they DO log extent allocations. They need to do this so that if the process is terminated unexpectedly (maybe the power goes out), SQL can recover the space.

Therefore with large bcp's/select into's - when a lot of extents need allocating - the log can still fill. In which case it needs to be made larger. 

Michael R. Hotek

All content on this site, except where noted, represents an original work of Michael R. Hotek and is protected by applicable copyright laws. The SQL Server FAQ is the sole work of Neil Pike. No page, portion of a page, or download may be used for commercial purposes in whole or in part without the express, written permission of the applicable author.