Thread: pg_dump

Am 12.08.24 um 21:09 schrieb Wasim Devale:
> Hi All
>
> Please let me know if the below option persists while using pg_dump
> command:
>
> -t table_name --exclude-column column_name
>
> I have a table with a column having bytea data type (BLOBS). I just
> want to exclude this in the dump file as it is of 99GB but I want the
> other data in the same table which is of only 22MB.
>
> Please let me know any work around this.
>
> I used this option in pg_dump but that didn't work:
>
> --exclude-table-data = table_name
>
> PG version 12.19
>
> Thanks,
> Wasim
No, pg_dump can only dump complete tables.

An alternative would be exporting the result of a select command via
COPY or \copy to a file, which can easily be read again with COPY or \copy

COPY is an SQL command and has to be used by a superuser because it
writes to (or reads from) a file on the server.
\copy is a psql command and thus can only be executed in psql (not any
other client) and by any user, because it writes to (or reads from) a
file on the client computer.

Kind Regards,

Holger

--

Holger Jakobs, Bergisch Gladbach

I did one thing, we can exclude the toast table in the pg_dump command that has the BLOBS data for a particular table.

--exclude-table-data=pg_toast.pg_toast_10176226

Thanks,
Wasim

On Tue, 13 Aug, 2024, 12:48 am Holger Jakobs, <holger@jakobs.com> wrote:

Am 12.08.24 um 21:09 schrieb Wasim Devale:
> Hi All
>
> Please let me know if the below option persists while using pg_dump
> command:
>
> -t table_name --exclude-column column_name
>
> I have a table with a column having bytea data type (BLOBS). I just
> want to exclude this in the dump file as it is of 99GB but I want the
> other data in the same table which is of only 22MB.
>
> Please let me know any work around this.
>
> I used this option in pg_dump but that didn't work:
>
> --exclude-table-data = table_name
>
> PG version 12.19
>
> Thanks,
> Wasim
No, pg_dump can only dump complete tables.

An alternative would be exporting the result of a select command via
COPY or \copy to a file, which can easily be read again with COPY or \copy

COPY is an SQL command and has to be used by a superuser because it
writes to (or reads from) a file on the server.
\copy is a psql command and thus can only be executed in psql (not any
other client) and by any user, because it writes to (or reads from) a
file on the client computer.

Kind Regards,

Holger

--

Holger Jakobs, Bergisch Gladbach

Wasim Devale <wasimd60@gmail.com> writes:
> I did one thing, we can exclude the toast table in the pg_dump command that
> has the BLOBS data for a particular table.
> --exclude-table-data=pg_toast.pg_toast_10176226

Utterly pointless.  pg_dump does not dump toast tables as such;
it's only concerned with their parent "regular" tables.  It will
fetch data from the regular tables, and it's not concerned with
the server-side implementation detail that some of that data
might be coming out of a toast table.

                        regards, tom lane