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Re: Backend working directories and absolute file paths

From: Andrew Dunstan <andrew(at)dunslane(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Backend working directories and absolute file paths
Date: 2005-06-30 18:20:22
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers

Tom Lane wrote:

>What I am speculating about is:
>	1. At postmaster start (or standalone backend start),
>	   chdir into $PGDATA.
>	2. Henceforth, address everything under $PGDATA by
>	   relative paths; don't use DataDir in the path at all.
>This way, if someone moves a data directory with a running postmaster
>in it, nothing breaks at all.  It would probably run a bit faster too,
>since file open calls would have fewer directories to traverse through.

Makes plenty of sense, and is a common way of working.

>The only downside I can see to it is that backend and postmaster crashes
>would all consistently dump core into $PGDATA (on platforms where cores
>dump into the working directory, which is many but not all).  The
>current arrangement makes backends dump core into the subdirectory for
>the database they are in, which sometimes makes it a bit easier to
>identify what's what.  But I can't see that that's a valuable enough
>property to override the advantages of using relative paths.

Maybe I have misunderstood. Could the backends not chdir into the db 
subdir and then do everything relative to that (using .. if necessary)?

How does this all play with tablespaces?



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