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PostgreSQL overall design

From: Gnanavel S <s(dot)gnanavel(at)gmail(dot)com>
To: pgsql-performance(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org
Subject: PostgreSQL overall design
Date: 2005-09-27 09:50:05
Message-ID: eec3b03c0509270250bc2fc97@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-performance
Hi All,

Can anyone please tell/point me where I can get the postgresql system layout
(I've an interest to contribute). I would also like to know the files
involved for performing each task ( for eg when doing a select operation
what is exactly happening in postgres along with the files).

I was wandering inside the source for a while and I couldn't get a start
point to go with.

Need a clarification in copydir.c file of src/port directory, In the
following snippet the destination directory is created first then the source
directory is read. Suppose if I don't have permission to read the source,
even then the destination directory would be created.
I just want to know whether there is any reason for doing so?

if (mkdir(todir, S_IRUSR | S_IWUSR | S_IXUSR) != 0)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not create directory \"%s\": %m", todir)));

xldir = AllocateDir(fromdir);
if (xldir == NULL)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not open directory \"%s\": %m", fromdir)));



--
with thanks & regards,
S.Gnanavel
Satyam Computer Services Ltd.

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