Marc:
I agree with Paul. If you are thinking of use Informix Encryption at Rest there is no noticeable impact. CPU usage will be a little bit higher, but if you are not bumping up against 0% idle now it's no biggie.
If, on the other hand, you are talking about column level encryption, that's a different animal. There will be an impact.
Art
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Art S. Kagel, President and Principal Consultant
ASK Database Management Corp.
www.askdbmgt.com------------------------------