Hi Hassene, I'm glad it helped you While there will be an anwser to your question of what are the maximum values for Oracle Express, there are a few key factors I'd need to know first:1. What Operating System are you running it on?2. Is the Operating System 32bit or 64bit (although Oracle XE is 32bit only, this still affects how many processes the OS can handle in total)3. How much RAM is available to the Operating System