on the order in case of lazy
evaluation.
Han Holl
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TIP 2: Don't 'kill -9' the postmaster
wrong with the much simpler
where cheap_function(item) 0 and where very_expensive_function(item) 0.
It's all about the order of evaluation.
Thanks,
Han Holl
---(end of broadcast)---
TIP 1: if posting/reading through Usenet, please send
?
Or is there a hook in the system that would allow me too look at and maybe
reorder expressions before they are executed ?
Cheers,
Han Holl
---(end of broadcast)---
TIP 3: Have you checked our extensive FAQ?
http://www.postgresql.org/docs/faq
like this has ever be considered ?
I seem to encounter many queries where the order in the where clause matters,
(but then we have a kind of weird database).
Cheers,
Han Holl
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TIP 9: In versions below 8.0, the planner
On Tuesday 29 November 2005 00:42, Jerry LeVan wrote:
/var/tmp/rpm-tmp.58757: line 79: fg: no job control
error: Bad exit status from /var/tmp/rpm-tmp.58757 (%prep)
[ cut ]
Any suggestions?
Well, I would look at what line 79 of /var/tmp/rpm-tmp.58757 has to say.
Cheers,
Han Holl
with something more concrete.
Thanks,
Han Holl
---(end of broadcast)---
TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
: Called cfie 1129893542.714536
NOTICE: Called func_display 1129893542.732444
plg_cfie
--
(1 row)
It's not a plruby issue, I tested with plpgsql (your noti) as well.
Cheers,
Han Holl
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TIP 9: In versions below 8.0
different update rules with a select each) but in _all_ cases the second
function is executed before the first, or possibly at the same time (but I
didn't think the backend is threaded).
Is this known behaviour, and what can I do to change it?
Thanks in advance for any suggestions,
Han Holl
P.S. I
shorter that a complet postgresql.conf,here's the diff against
/usr/share/pgsql/postgresql.conf.sample, from postgresql-8.0.3-1PGDG for RH9.
Have I missed something ?
Cheers,
Han Holl
--- /usr/share/pgsql/postgresql.conf.sample 2005-09-22 15:49:14.0
+0200
+++ /u/postgres
logging and quieter behaviour.
None of our applications is using this format, that's for sure.
Cheers
Han Holl
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TIP 5: don't forget to increase your free space map settings
somewhere ?
If the only penalty is slower analyzing, I don't care: we analyze at night
when these system are idle.
Cheers,
Han Holl
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TIP 4: Have you searched our list archives?
http://archives.postgresql.org
improve 1% and worsen 99%.
Cheers,
Han Holl
---(end of broadcast)---
TIP 5: don't forget to increase your free space map settings
%'::text))
Total runtime: 775.068 ms
(6 rows)
I got a similar problem with a functional index, but I guess my only option is
to create a real column with the results of the function, and replace the
functional index with a real one.
Thanks to all,
Han Holl
---(end
uneven distribution of surnames
(this must be even worse in China).
A third possibility would be to rewrite such a query as a nested query: is
there a rewrite query - hook (like apaches mod_rewrite) available ? Or is
there a somewhere a proxy-server that could do this ?
Cheers,
Han Holl
million records).
Any suggestions welcome.
Cheers,
Han Holl
---(end of broadcast)---
TIP 3: Have you checked our extensive FAQ?
http://www.postgresql.org/docs/faq
that something is not equal as well. The trouble is I can't
seem to find it.
We're going to replay what happened on a different machine, and hopefully will
find something.
Thanks,
Han Holl
---(end of broadcast)---
TIP 6: explain analyze is your friend
of docs in the coming months, because real people depend on reasonable performance of our databases.
Cheers, and thanks again,
Han Holl
PS We still have to be careful how to formulate conditions:
where fase in ('1','2')
is ok, and uses the index, but the logically identical:
where position(fase
anything for me.
Of course I can do a select into, but my guess is it would be even more
expensive than evaluating these functions twice.
Thanks in advance,
Han Holl
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TIP 5: don't forget to increase your free space map
file.
Once I had rebuild the RPMS and erased the compat libs, everything was fine.
Cheers,
Han Holl
---(end of broadcast)---
TIP 6: explain analyze is your friend
something like this:
select f from
(select expensive_function(table) as f from table offset 0) ss
where f is not null;
Thanks.
I think I can safely say I wouldn't have invented this magic in a year.
Cheers
Han Holl
---(end of broadcast)---
TIP
to it.
Is there a way to convince the planner to use the fase index for this type of
query, or is there a hook somewhere that I missed that allows me to rewrite
a query like the above with a server-side function ?
Thanks in advance,
Han Holl
---(end of broadcast
On Tuesday 04 October 2005 22:26, [EMAIL PROTECTED] wrote:
Just a guess but have you tried using an in clause?
select something from table where fase in ('1' , '2');
Not surprisingly, this also does a sequential scan on the table. (It would be
_very_ diffcult to see that this is a union, I
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