Re: *** PROBABLY SPAM *** Does the psql executable support a "fetch many" approach when dumping large queries to stdout?

От: Bruce Momjian
Тема: Re: *** PROBABLY SPAM *** Does the psql executable support a "fetch many" approach when dumping large queries to stdout?
Дата: ,
Msg-id: 201004130249.o3D2nUd02232@momjian.us
(см: обсуждение, исходный текст)
Ответ на: Re: *** PROBABLY SPAM *** Does the psql executable support a "fetch many" approach when dumping large queries to stdout?  ("Pierre C")
Список: pgsql-performance


Pierre C wrote:
> > Does the psql executable have any ability to do a "fetch many", using a
> > server-side named cursor, when returning results? It seems like it tries
> > to retrieve the query entirely to local memory before printing to
> > standard out.
>
> I think it grabs the whole result set to calculate the display column
> widths. I think there is an option to tweak this but don't remember which,
> have a look at the psql commands (\?), formatting section.

See the FETCH_COUNT variable mentioned in the psql manual page.

--
  Bruce Momjian  <>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com


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