At 5:49pm -0500 Mon, 18 Nov 2013, Rohit Goyal wrote:
> I am very new to postgresql. I want to know from where the Postgresql
> code start to run.
>
> Can you please specify me the specific file in Postgresql?
Do you mean how to access a running instance of Postgres? Postgres is a
database, so generally you will access it through another program. This
program may be an interactive DB administration tool, like PgAdmin, or
it may be an application (such as what one might build with Python or C).
If you want to directly interact with Postgres from the command line,
there is Psql[1].
As you are new to Postgres in general, I would suggest spending an hour
reading the Preface and Tutorial from PostreSQL's amazingly well-written
documentation[2].
If you are looking to develop Postgres, start with [3] and [4].
Cheers,
Kevin
[1] http://www.postgresql.org/docs/current/static/app-psql.html
[2] http://www.postgresql.org/docs/current/static/index.html
[3] http://www.postgresql.org/docs/current/static/internals.html
[4] http://wiki.postgresql.org/wiki/Developer_FAQ