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To: hasbeen101 who wrote (2097)	7/7/1998 9:08:00 AM
From: Mark Finger	Respond to of 3194

>>Don't Persistence specialize in products that help you to store >>objects in an RDBMS? That was the story 2-3 years ago. Persistence claimed to have a middleware package that sat on top of a RDBMS that added the object support and used the RDBMS engine just for storage. Rumor was that Sybase was going to use it before they changed directions and built their stuff into the ASE kernel/storage scheme. I suspect that this story is pretty dated with both IBM and IFMX (and Sybase to a slightly lesser extent) shipping products with user-definable data types integrated into the kernel and even Oracle's solution should be superior to the Persistence model because the integration into the engine is much higher. In the Persistence model, the DBMS engine knows nothing about the objects and would find it impossible to do any optimization for performance. It might be slightly more flexible that the next Oracle version (8.1) which is reported to be limited to 1 type of user-defined object per table, but that would seem to be its only advantage.