[comp.databases] heterogenous distributed databases

lynch@theory.tn.cornell.edu (Tim Lynch) (11/28/90)

Hello,

I am interested in coming up to speed on what the current state of
the art is in regards to heterogenous distributed database design.
I am interested in something that allows for a user-interface front-end
to query a network of data servers to:
  1) locate the information in question, and
  2) engage in a dialog (front-end and data server) to establish what
     and how the data will be transmitted.
I'm interested specifically in systems that:
  1) allow a front-end to be completely ignorant of the data layout, and
  2) define some canonical form(s) for data exchange.

For example, consider several data servers each maintaining a
bibliographic database with each db formatted in some unique manner.  
Rather that develop a front-end that knows about each db, I would 
rather develop a data server module for each db that can communicate 
with the user front-end and provide bibliographic info in some canonical 
form to the front-end.

I'm rather new to this field and am searching for information where ever I
can.  At this point, I must admit I haven't been very successful in
locating anything.  Pointers to real working systems, research projects,
or simple 'toy' implementations would be greatly appreciated!

Thanks in advance.  If anyone wishes to see what I glean, e-mail me.
If interest is sufficient, I'll post a summary.

Tim Lynch, Mann Library