Dave, > Is there any real performance benefit to using base 2 sizes vs. base 10 when > dealing with datafiles and extents? Oracle will round the extent size up to an even block size. So you should use binary for extent sizes. For datafiles, I would just use what is most convenient for you. Convenience reduces mistakes. Far better to be off by one percent than worry so much about saving a percent or two that you use K for file size when you meant M. Dennis Williams -- //www.freelists.org/webpage/oracle-l