On Sun, Dec 18, 2005 at 09:56:39PM -0500, Chris Browne wrote:
> The filenames are the OID numbers associated with either databases
> (see pg_catalog.pg_database) or tables (see pg_catalog.pg_class).
For tables, indexes, etc., the filename isn't necessarily the same
as the object's oid; it starts out that way but it can change after
commands like TRUNCATE and CLUSTER. pg_class.relfilenode contains
the name of a relation's on-disk file.
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