Re: Tablespace OID, database OID, relfilenode

On 1/17/23 07:35, Wiwwo Staff wrote:
> Hi Laurenz,
> thanks for your answer!
> Ok, but I don't think "1663" is a sort of constant value for "base", 
> isn't it?

 From source:

backend/catalog/postgres.bki

open pg_tablespace
insert ( 1663 pg_default 10 _null_ _null_ )
insert ( 1664 pg_global 10 _null_ _null_ )

> 
> Let me clarify my question: how do I get, with a query, from "base" to 
> 1663 (or whatever the value is)?

  select * from pg_tablespace ;
  oid  |  spcname   | spcowner | spcacl | spcoptions
------+------------+----------+--------+------------
  1663 | pg_default |       10 | NULL   | NULL
  1664 | pg_global  |       10 | NULL   | NULL

> 
> On Tue, Jan 17, 2023 at 4:01 PM Laurenz Albe <laurenz.albe@cybertec.at 
> <mailto:laurenz.albe@cybertec.at>> wrote:
> 
>     On Tue, 2023-01-17 at 15:48 +0100, Wiwwo Staff wrote:
>      > Quick and to the point:
>      >
>      > If i execute
>      > select pg_relation_filepath('pgbench_accounts');
>      >
>      > I get
>      >  pg_relation_filepath
>      > ----------------------
>      >  base/5/16398
>      >
>      > where "base" is tablespace, but not tablespace OID, nor
>     tablespace name.
>      > How do I link it to get from "base" the tablespace OID?
>      >
>      > Or, in other words, given table  pgbench_accounts, how do I get
>     tablespace OID,
>      > database OID and relfilenode so that I can use this info to
>     filter output of pg_waldump?
> 
>     The tablespace OID is 1663, since "base" is the default tablespace
>     "pg_default".
> 
>     Yours,
>     Laurenz Albe
>     -- 
>     Cybertec | https://www.cybertec-postgresql.com
>     <https://www.cybertec-postgresql.com>
> 

-- 
Adrian Klaver
adrian.klaver@aklaver.com