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Thread: [ADMIN] how to find a pg_toast table's primary table

[ADMIN] how to find a pg_toast table's primary table

From
ProPAAS DBA
Date:
Hi all;


I'm seeing this table as the most vacuumed table:


pg_toast.pg_toast_16784

How do I find the primary table for this toast table?



Thanks in advance

Re: [ADMIN] how to find a pg_toast table's primary table

From
"Joshua D. Drake"
Date:
On 12/13/2016 03:24 PM, ProPAAS DBA wrote:
> Hi all;
>
>
> I'm seeing this table as the most vacuumed table:
>
>
> pg_toast.pg_toast_16784
>
> How do I find the primary table for this toast table?

Within the database:

select oid::regclass from pg_class where reltoastrelid='16784'::regclass;

JD;

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Re: [ADMIN] how to find a pg_toast table's primary table

From
Jerry Sievers
Date:
ProPAAS DBA <dba@propaas.com> writes:

> Hi all;
>
>
> I'm seeing this table as the most vacuumed table:
>
>
> pg_toast.pg_toast_16784
>
> How do I find the primary table for this toast table?

Find the pg_class row with reltoastrelid = $oid-of-toast-table.

HTH

>
>
>
> Thanks in advance

--
Jerry Sievers
Postgres DBA/Development Consulting
e: postgres.consulting@comcast.net
p: 312.241.7800

Re: [ADMIN] how to find a pg_toast table's primary table

From
Jorge Torralba
Date:
select relname from pg_class where reltoastrelid = ( select oid from pg_class where relname = 'toast_table_name' );

On Tue, Dec 13, 2016 at 3:24 PM, ProPAAS DBA <dba@propaas.com> wrote:
Hi all;


I'm seeing this table as the most vacuumed table:


pg_toast.pg_toast_16784

How do I find the primary table for this toast table?



Thanks in advance



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Thanks,

Jorge Torralba
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Re: [ADMIN] how to find a pg_toast table's primary table

From
Tom Lane
Date:
Jerry Sievers <gsievers19@comcast.net> writes:
> ProPAAS DBA <dba@propaas.com> writes:
>> pg_toast.pg_toast_16784
>> How do I find the primary table for this toast table?

> Find the pg_class row with reltoastrelid = $oid-of-toast-table.

After you've done that a couple of times, you'll notice that the numeric
part of the toast table's name is the OID of its parent, so really you
just need to do

select '16784'::regclass;

Confirming the reltoastrelid link is a good idea though.

            regards, tom lane