Re: Need advice to avoid ORDER BY
| От | Scott Marlowe |
|---|---|
| Тема | Re: Need advice to avoid ORDER BY |
| Дата | |
| Msg-id | CAOR=d=1FwYehYpoZJ4ER82PqVYKh9N9rOCHkmWno1iO+Y5RjuQ@mail.gmail.com обсуждение исходный текст |
| Ответ на | Need advice to avoid ORDER BY (Condor <condor@stz-bg.com>) |
| Список | pgsql-general |
Try an index like:
create index yada on mytable (id) where valids=0;
then
select max(jobid) from mytable where valids=0;
On Thu, Apr 4, 2013 at 3:32 PM, Condor <condor@stz-bg.com> wrote:
Hello,
I have one query in my postgresql 9.2.3 that took 137 ms to me executed and looking a way
what I can do to optimize it. I have one table generated numbers from 1 to 1 000 000 and
I need to get first free id, meanwhile id's when is taken can be free (deleted data and id
is free for next job). Table is simple:
id serial,
jobid text,
valids int default 0
(Yes, I have index).
my query is: SELECT jobid FROM mytable WHERE valids = 0 ORDER BY id ASC LIMIT 1
I need the first id only.
My question is: Is there a way how I can avoid using ORDER BY to receive the first
free id from mytable ?
Cheers,
Condor
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