Hi Andrea,
I wasn't trying to downplay your penchant to push PostGres, it's something
I understand and agree with. Your explanation of the differences was very
informative - I've seen posts mentioning them in passing before, but this was a
little more in depth, thanks for sharing.
Cheers,
Jonathan
---- On Wed, 22 Jun 2016 13:31:39 +0100 Andrea
Aime<andrea.a...@geo-solutions.it> wrote ----
On Wed, Jun 22, 2016 at 2:15 PM, Jonathan Moules
<jonathan-li...@lightpear.com> wrote:
While Andrea has an (understandable) leaning towards PostGres, I'd be surprised
if you can't optimise Oracle to get the desired result too if you're fixed with
that (but if you're not - PostGres would probably be a worthwhile change).
The leaning has some explanation, that goes beyond the natural sympathy for
another open source project.
GeoServer is translating every OGC request into the best query it can setup,
but the translation
is still, after all, automatic, with little or no control on the admin side
(sql views might help to some extent).
In Oracle developers decided to add query hints, every time a query misbehaves
you can add one of those to force the better
execution path... that's nice, as long as you can control how the queries are
written.... but that's not the case in GeoServer.
Of course that reduced pressure to improve the query planner (and made the
Oracle consultant market a bigger and more
profitable one).
In PostgreSql developers instead refused to add query hints support, and
treated every case in which the optimizer took
the wrong path as a bug. At the beginning that was pretty painful, but over
time the planner evolved to the point that it's actually
very good... this couples well with an automatic query generator, as long as
the query is valid the db should not need
any help using the best access path.
If you think about it setting up a WFS (or a WMS with CQL_FILTER) is really
like saying "hey, here is my database, hit it with whatever you want", since
people can literally write the filter they feel like, with no limitation on
complexity.
The is no query hint salvation there, each query is dynamic and defined by the
user at the time the request is made...
either the database is smart and fast on its own, without query specific help
from a human, or you're in for a pile of troubles.
Cheers
Andrea
--
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