Yes, there are quite a few niche cases where data storage is better
handled by Object (hierarchical) Databases than by relational ones.
OODBs perform much better storing and retrieving large numbers of small
objects organized in a hierarchical way.

The reason they (OODBs) are not more popular has to do with the fact
that these use cases are not very frequent and NOT with the fact that
such use cases just do not exist.


Regards,
Paulo Gaspar

Roman Rokytskyy wrote:

><SNIP />
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>>Or the XML-crowd is repeating past mistakes... Dunno.
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>We'll see :) I know quite successful examples of using hierarchical
>databases for traffic optimization and in oil-drilling prognosis.
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><SNIP />
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>Roman
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