On Tue, 9 Jun 2020 at 01:07, Ron wrote:
>
> On 6/8/20 3:40 AM, Oleksandr Shulgin wrote:
> [snip]
>
> I've found the original commit adding this feature in version 11:
> https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=1aba8e651ac3e37e1d2d875842de1e0ed22a651e
> It says:
>
> "Hash
On 6/8/20 3:40 AM, Oleksandr Shulgin wrote:
[snip]
I've found the original commit adding this feature in version 11:
https://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=1aba8e651ac3e37e1d2d875842de1e0ed22a651e
It says:
"Hash partitioning is useful when you want to partition a
On Sat, Jun 6, 2020 at 6:14 PM Michel Pelletier
wrote:
>
> Well lets take a step back here and look at the question, hash
> partitioning exists in Postgres, is it useful? While I appreciate the need
> to see a fact demonstrated, and generally avoiding argument by authority,
> it is true that
On 6/5/20 8:51 AM, Jeff Janes wrote:
On Fri, Jun 5, 2020 at 6:12 AM Oleksandr Shulgin
mailto:oleksandr.shul...@zalando.de>> wrote:
[snip]
For a bulk load you'd likely want to go with an empty partition w/o
indexes and build them later, after loading the tuples.
That only works if
On Wed, Jun 3, 2020 at 4:55 AM Oleksandr Shulgin <
oleksandr.shul...@zalando.de> wrote:
>
> Do you also assign the partitions to different tablespaces as you've
> hinted below or do you see performance improvement from partitioning
> alone? How does that work? Does it give better results than
On Fri, Jun 5, 2020 at 6:12 AM Oleksandr Shulgin <
oleksandr.shul...@zalando.de> wrote:
> On Thu, Jun 4, 2020 at 4:32 PM Jeff Janes wrote:
>
>> On Wed, Jun 3, 2020 at 7:55 AM Oleksandr Shulgin <
>> oleksandr.shul...@zalando.de> wrote:
>>
>> With hash partitioning you are not expected, in
On Thu, Jun 4, 2020 at 4:32 PM Jeff Janes wrote:
> On Wed, Jun 3, 2020 at 7:55 AM Oleksandr Shulgin <
> oleksandr.shul...@zalando.de> wrote:
>
> With hash partitioning you are not expected, in general, to end up with a
>> small number of partitions being accessed more heavily than the rest. So
On Wed, Jun 3, 2020 at 7:55 AM Oleksandr Shulgin <
oleksandr.shul...@zalando.de> wrote:
With hash partitioning you are not expected, in general, to end up with a
> small number of partitions being accessed more heavily than the rest. So
> your indexes will also not fit into memory.
>
> I have
(sticking to pgsql-general)
On Tue, Jun 2, 2020 at 7:45 PM Michel Pelletier
wrote:
>
> On Tue, Jun 2, 2020 at 10:17 AM Oleksandr Shulgin <
> oleksandr.shul...@zalando.de> wrote:
>
>>
>> I was reading up on declarative partitioning[1] and I'm not sure what
>> could be a possible application of
On Tue, Jun 2, 2020 at 7:47 PM Stephen Frost wrote:
>
> Please don't cross post to multiple lists without any particular reason
> for doing so- pick whichever list makes sense and post to that.
>
Sorry for the trouble, I should've checked it more carefully.
When posting I did think it may be
Greetings,
Please don't cross post to multiple lists without any particular reason
for doing so- pick whichever list makes sense and post to that.
* Oleksandr Shulgin (oleksandr.shul...@zalando.de) wrote:
> I was reading up on declarative partitioning[1] and I'm not sure what could
> be a
On Tue, Jun 2, 2020 at 10:17 AM Oleksandr Shulgin <
oleksandr.shul...@zalando.de> wrote:
> Hi!
>
> I was reading up on declarative partitioning[1] and I'm not sure what
> could be a possible application of Hash partitioning.
>
> Is anyone actually using it? What are typical use cases? What
On Tue, Jun 2, 2020 at 10:17 AM Oleksandr Shulgin <
oleksandr.shul...@zalando.de> wrote:
> That *might* turn out to be the case with a small number of distinct
> values in the partitioning column(s), but then why rely on hash
> assignment instead of using PARTITION BY LIST in the first place?
>
>
Hi,
I use it quite often, since I'm dealing with partitioning keys that have
high cardinality, ie, high number of different values. If your
cardinality is very high, but your spacing between values is not
uniform, HASH will balance your partitioned tables naturally. If your
spacing between
Hi!
I was reading up on declarative partitioning[1] and I'm not sure what could
be a possible application of Hash partitioning.
Is anyone actually using it? What are typical use cases? What benefits
does such a partitioning scheme provide?
On its face, it seems that it can only give you a
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