Thread: pgsql_tmp and external sort

On 02.07.2013 10:55, Soroosh Sardari wrote:
> Dear Hackers
>
> Recently I find about pgsql_tmp directory. As I think, this directory is a
> area for making temporal files which are used for external sort.
>
> I wonder if anyone could help me to find the module of pg that is
> responsible for the temporal space and external sort in the PG source code.

See src/backend/utils/sort/tuplesort.c and 
src/backend/storage/file/buffile.c for starters.

- Heikki

From: "Soroosh Sardari" <soroosh.sardari@gmail.com>
> I wonder if anyone could help me to find the module of pg that is
> responsible for the temporal space and external sort in the PG source 
> code.

See src/backend/utils/sort/ for sort implementation.
That uses BufFile in src/backend/storage/file/buffile.c,
which in turn uses OpenTemporaryFile in src/backend/storage/file/fd.c.

Regards
MauMau