Re: JDO

[Robert S. Sfeir]

point taken.  Fair enough :-)

On Tuesday, Feb 25, 2003, at 15:25 US/Eastern, Thomas Mahler wrote:

Hi again Robert,

Robert S. Sfeir wrote:
On Tuesday, Feb 25, 2003, at 14:59 US/Eastern, Thomas Mahler wrote:
SO any queries that do a (non-primary key based) criteria lookup, 
will result in loading the complete extent (all instances of a given 
class) into memory an then filter all matching instances.
This is even worse than an full table scan in the DBMS!
WOA!  instant cartesian product!  Scan all rows of all tables you're 
selecting... Geez!  Nice going Sun!
to be fair:
SUN did not write the JDORI to provide performant access to any real 
database, but as a proof of concept of the JDO specification.
It's not meant for production.
They designed these interfaces for a simple OODBMS (called FoStore).
I think we can be very happy that they designed their JDORI in such a 
flexible way that allows to plug in the OjbStore adaptor at all.

cheers,
Thomas
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