Thanks Alan for this remark, I will have a look at this possibility... That would avoid me finding a compromise between my 2Kb-Blocks instance and my 8Kb-Blocks instance. The article you pointed me is very interesting.

The_Duck, you're right, with solution 2, a synonym would surely avoid the problem of switching from one table to the other. Good idea !

Thanks again to both of you !

Best regards,

RBARAER