Thread: Analyzing last run query in psql
I frequently need to analyze the last query in psql:
select * from table where id = 1;
explain analyze select * from table where id = 1;
It would be nice to be able to do this:
explain analyze $LAST
(or can I do something like that already?)
I'm not using psql interactively, I pipe files into psql (if it matters).
Joe
Joe Van Dyk <joe@tanga.com> wrote: > I frequently need to analyze the last query in psql: > select * from table where id = 1; > explain analyze select * from table where id = 1; > > It would be nice to be able to do this: > explain analyze $LAST > > (or can I do something like that already?) > > I'm not using psql interactively, I pipe files into psql (if it matters). There is no history or something like that, but you can use autoexplain. http://www.postgresql.org/docs/9.2/interactive/auto-explain.html Andreas -- Really, I'm not out to destroy Microsoft. That will just be a completely unintentional side effect. (Linus Torvalds) "If I was god, I would recompile penguin with --enable-fly." (unknown) Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889°
On Wed, Jul 3, 2013 at 7:05 AM, Joe Van Dyk <joe@tanga.com> wrote: > I frequently need to analyze the last query in psql: > select * from table where id = 1; > explain analyze select * from table where id = 1; > > It would be nice to be able to do this: > explain analyze $LAST > > (or can I do something like that already?) > > I'm not using psql interactively, I pipe files into psql (if it matters). I don't know of any feature like that, but maybe you can do the following in your script/files: \set lastquery 'your-query-here' so that you can do something like explain :lastquery; But if you are able to manipulate your scripts you can just insert the explain by hand on queries you are interested in, or use autoexplain for all the queries. Luca
It was my dream to have something we already have in shell - explain analyze !$ I think it should be not very difficult. Oleg On Tue, 2 Jul 2013, Joe Van Dyk wrote: > I frequently need to analyze the last query in psql: > select * from table where id = 1; > explain analyze select * from table where id = 1; > > It would be nice to be able to do this: > explain analyze $LAST > > (or can I do something like that already?) > > I'm not using psql interactively, I pipe files into psql (if it matters). > > Joe > Regards, Oleg _____________________________________________________________ Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru), Sternberg Astronomical Institute, Moscow University, Russia Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/ phone: +007(495)939-16-83, +007(495)939-23-83
On Wed, Jul 3, 2013 at 6:43 AM, Oleg Bartunov <oleg@sai.msu.su> wrote:
It was my dream to have something we already have in shell -
explain analyze !$
It would probably be: explain analyze !!
(at least in bash syntax)
Joe
I think it should be not very difficult.
OlegRegards,
On Tue, 2 Jul 2013, Joe Van Dyk wrote:I frequently need to analyze the last query in psql:
select * from table where id = 1;
explain analyze select * from table where id = 1;
It would be nice to be able to do this:
explain analyze $LAST
(or can I do something like that already?)
I'm not using psql interactively, I pipe files into psql (if it matters).
Joe
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
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I'd like the execution plan to be in the psql output, not in the postgres log.
On Tue, Jul 2, 2013 at 11:20 PM, Andreas Kretschmer <akretschmer@spamfence.net> wrote:
There is no history or something like that, but you can use autoexplain.Joe Van Dyk <joe@tanga.com> wrote:
> I frequently need to analyze the last query in psql:
> select * from table where id = 1;
> explain analyze select * from table where id = 1;
>
> It would be nice to be able to do this:
> explain analyze $LAST
>
> (or can I do something like that already?)
>
> I'm not using psql interactively, I pipe files into psql (if it matters).
http://www.postgresql.org/docs/9.2/interactive/auto-explain.html
Andreas
--
Really, I'm not out to destroy Microsoft. That will just be a completely
unintentional side effect. (Linus Torvalds)
"If I was god, I would recompile penguin with --enable-fly." (unknown)
Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889°
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