Thread: Using FOREIGN TABLE to get the Size of the Actual Remote Table Behind it

Using FOREIGN TABLE to get the Size of the Actual Remote Table Behind it

From

Avi Weinberg

Date:

13 January 2022, 12:49:22

Hi Experts,

Is it possible to get the size of the table a foreign table is pointing to (without creating another connecting to the remote server)? Obviously this "select pg_size_pretty(pg_total_relation_size('f_table'))" returns 0.

Thanks!

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Re: Using FOREIGN TABLE to get the Size of the Actual Remote Table Behind it

From

Laurenz Albe

Date:

13 January 2022, 22:22:28

On Thu, 2022-01-13 at 09:49 +0000, Avi Weinberg wrote:
> Is it possible to get the size of the table a foreign table is pointing to (without creating
> another connecting to the remote server)?  Obviously this "select
> pg_size_pretty(pg_total_relation_size('f_table'))" returns 0.

No, there is no straightforward way to do that.

What you could do is create a view on the remote database that provides the
required information and access that view via a foreign table.

Yours,
Laurenz Albe
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