Re: Query planning on partitioned table causes postgres 13.4 to consume all memory

Hi Tom,

On 19/09/2021 18:03, Tom Lane wrote:
> Duncan Sands <duncan(dot)sands(at)deepbluecap(dot)com> writes:
>> [ planning DELETE on a thousand-partition table takes forever ]
>
> FWIW, this situation has been very much improved for v14 [1].

thanks, part (2) of that commit indeed looks like it should solve it.

Best wishes, Duncan.

> In older branches, the best advice I can give you is "don't use
> so many partitions". Especially not with hash partitioning,
> where the query WHERE clause generally won't translate to any
> useful pruning of the partitions.
>
> (Personally, I think that hash partitioning is an evil that
> we shouldn't have implemented at all. Or at least there
> should be stronger warnings about it in the manual than there
> are now.)
>
> regards, tom lane
>
> [1] https://git.postgresql.org/gitweb/?p=postgresql.git&a=commitdiff&h=86dc90056
>