Hi, I do not think setting "_disable_logging" to true , will have much affect on the import performance, if imp has been tuned properly. Secondly if you are on 10g , datapump is an alternative. Regards Joseph Amalraj Juan Carlos Reyes Pacheco <juancarlosreyesp@xxxxxxxxx> wrote: Hi I was asking my self, and I decided to ask people who knows better about it: Which is the difference if I set all tablespace to nologging vs if I set the hidden parameter to disable logging _disable_logging. To get an import to development environment faster. I know I can't recover if there is a problem, etc, etc. The question is which is the real difference. .) Thank you -- Oracle Certified Profesional 9i 10g Orace Certified Professional Developer 6i 8 years of experience in Oracle 7,8i,9i,10g and developer 6i -- //www.freelists.org/webpage/oracle-l