Tom Lane írta:
> Boszormenyi Zoltan <zb@cybertec.at> writes:
>
>> This means add_child_rel_equivalences() is still takes
>> too much time, the previously posted test case calls this
>> function 482 times, it's called for almost every 10th entry
>> added to eq_classes. The elog() I put into this function says
>> that at the last call list_length(eq_classes) == 4754.
>>
>
> That seems like a ridiculously large number of ECs. What is the
> test query again?
>
> regards, tom lane
>
The test case is here:
http://archives.postgresql.org/message-id/4CBD9DDC.4040304@cybertec.at
create_table.sql for the main table plus childtables.sql.gz, the EXPLAIN
query is in the message body.
Basically, it's a model for a lot of data for three months, partitioned by
4 hour intervals for every day. Imagine the call list handled by a
phone company in a large country.
Best regards,
Zoltán Böszörményi
--
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Zoltán Böszörményi
Cybertec Schönig & Schönig GmbH
Gröhrmühlgasse 26
A-2700 Wiener Neustadt, Austria
Web: http://www.postgresql-support.de http://www.postgresql.at/