| From: | Boszormenyi Zoltan <zb(at)cybertec(dot)at> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Hans-Jürgen Schönig <postgres(at)cybertec(dot)at>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers Hackers <pgsql-hackers(at)postgresql(dot)org>, Josh Berkus <josh(at)agliodbs(dot)com> |
| Subject: | Re: plan time of MASSIVE partitioning ... |
| Date: | 2010-10-28 17:11:13 |
| Message-ID: | 4CC9AEB1.7070304@cybertec.at |
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| Lists: | pgsql-hackers |
Tom Lane írta:
> Boszormenyi Zoltan <zb(at)cybertec(dot)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
--
----------------------------------
Zoltán Böszörményi
Cybertec Schönig & Schönig GmbH
Gröhrmühlgasse 26
A-2700 Wiener Neustadt, Austria
Web: http://www.postgresql-support.de
http://www.postgresql.at/
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