PostgreSQL's table oid is not found in database - postgresql

Question

I have a question about PostgreSQL's table oid.
I create a table. oid is 24622
(-rw------- 1 postgres postgres 8192 Nov 29 17:45 24622)
and I found also modified files at the same time.
(-rw------- 1 postgres postgres 73728 Nov 29 17:45 12741)
(-rw------- 1 postgres postgres 32768 Nov 29 17:45 12744)
(-rw------- 1 postgres postgres 65536 Nov 29 17:45 12764)
(-rw------- 1 postgres postgres 57344 Nov 29 17:45 12767)
but those tables are not found in same database, no one is found.
ksh2=# select oid,relname from pg_class where oid = '12741';
oid | relname
-----+---------
(0 rows)
How can I find those tables???
(I also change schema, and try to find, but no one is found)
Thank you.

Answer 1

A filename doesn't necessarily correspond with oid:
Note that while a table's filenode often matches its OID, this is not
necessarily the case; some operations, like TRUNCATE, REINDEX, CLUSTER
and some forms of ALTER TABLE, can change the filenode while
preserving the OID.
The filename is stored in the relfilenode column:
Name of the on-disk file of this relation; zero means this is a
"mapped" relation whose disk file name is determined by low-level
state
So try searching for the relfilenode:
select name, relkind from pg_class where relfilenode = 12741;
The relkind column tells you what type of object the file represents:
r = ordinary table
i = index
S = sequence
v = view
c = composite type
t = TOAST table
f = foreign table