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Date: Sun, 22 Apr 2012 11:29:50 -0500
From: "Kevin Grittner" <Kevin.Grittner@wicourts.gov>
To: <sqlpro@club-internet.fr>,<pgsql-admin@postgresql.org>
Subject: Re: What is the role of pg_filenode.map ?
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"F. BROUARD / SQLpro"  wrote:
 
> in every database there is a file nammed pg_filenode.map wich I
> suppose give the map of the real filenode while some command make
> a divergence betwen the actuel object oid and the "new" filenode...
> Am I wright ?
 
If you want to understand internals like this, the best thing to do
is probably to read the source code.
 
http://git.postgresql.org/gitweb/?p=postgresql.git;a=blob;f=src/backend/utils/cache/relmapper.c;h=6f214957bf831c4a5c17ebc630f5151adc860135;hb=HEAD
 
-Kevin