Re: pg_relation_size on partitioned table

On Sat, Mar 26, 2022 at 11:35 AM Michael Paquier <michael(at)paquier(dot)xyz> wrote:
>
> On Fri, Mar 25, 2022 at 08:52:40PM +0800, Japin Li wrote:
> > Could we provide a function to get the total size of the partition table
> > though the partitioned table name? Maybe we can extend
> > the pg_relation_size() to get the total size of partition tables through
> > the partitioned table name.
>
> There are already many replies on this thread, but nobody has
> mentioned pg_partition_tree() yet, so here you go. You could use that
> in combination with pg_relation_size() to get the whole size of a tree
> depending on your needs.

Yeah. The docs have a note on using it for finding partitioned table size:

<para>
For example, to check the total size of the data contained in a
partitioned table <structname>measurement</structname>, one could use the
following query:
<programlisting>
SELECT pg_size_pretty(sum(pg_relation_size(relid))) AS total_size
FROM pg_partition_tree('measurement');
</programlisting>
</para>

Regards,
Bharath Rupireddy.