From: | "Daniel Westermann (DWE)" <daniel(dot)westermann(at)dbi-services(dot)com> |
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To: | "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org> |
Subject: | Why does the OID jump by 3 when creating tables? |
Date: | 2021-10-30 08:55:34 |
Message-ID: | ZR0P278MB092061F8F01770B16DFAB4A4D2889@ZR0P278MB0920.CHEP278.PROD.OUTLOOK.COM |
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Lists: | pgsql-general |
Hi all,
as I could not find the reason in the source code, can someone tell me why the OID counter jumps by 3 between two create table statements?
postgres=# create table t1 ( a int );
CREATE TABLE
postgres=# create table t2 ( a int );
CREATE TABLE
postgres=# select oid,relname from pg_class where relname in ('t1','t2');
oid | relname
-------+---------
16453 | t1
16456 | t2
(2 rows)
These seems not to happen with other objects, e.g. namespaces:
postgres=# create schema a;
CREATE SCHEMA
postgres=# create schema b;
CREATE SCHEMA
postgres=# select oid,nspname from pg_namespace where nspname in ('a','b');
oid | nspname
-------+---------
16459 | a
16460 | b
(2 rows)
... or indexes:
postgres=# select oid,relname from pg_class where relname in ('i1','i2');
oid | relname
-------+---------
16461 | i1
16462 | i2
Thanks in advance
Daniel
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