Try:
SELECT oid,* from pg_database ;
I suspect the relfilnode you are looking at is another database in the cluster.
--
Adrian Klaver
adrian.klaver@xxxxxxxxx
Maybe I am possibly doing that. I did a du -h --max-depth=1 in the base/ within the data directory. This showed a single folder that contained ~34 GB. On performing a ls in this, it showed 2 oids/filenodes that had more than 1 GB (multiple files with .<number> at the end). The large table I mentioned in the original post was in this folder, so I assumed that the rest of the files in the same directory belonged to the same DB.
Have I made an incorrect assumption ?