Re: 9.5 new features

http://www.postgresql.org/docs/9.5/interactive/brin-intro.html

62.1. Introduction
...
"A block range is a group of pages that are physically adjacent in the
table; for each block range, some summary info is stored by the index."

From the above, may I presume that it is best to cluster (or sort), the
table based on the intended BRIN
column(s) before actually creating the index to insure the pages are
adjacent? If so, should that not be included in the documentation, instead
of implied?

On Sat, Jan 23, 2016 at 5:49 AM, FarjadFarid(ChkNet) <
farjad(dot)farid(at)checknetworks(dot)com> wrote:

> Sounds like a great feature.
>
> How can it be tested?
>
> I am particularly thinking of window servers and effect of this on a live
> system and any performance issues.
>
> It is an exciting feature. Thanks guys.
>
>
> -----Original Message-----
> From: pgsql-general-owner(at)postgresql(dot)org [mailto:
> pgsql-general-owner(at)postgresql(dot)org] On Behalf Of David Rowley
> Sent: 23 January 2016 03:14
> To: John R Pierce
> Cc: PostgreSQL
> Subject: Re: [GENERAL] 9.5 new features
>
> On 23 January 2016 at 09:49, John R Pierce <pierce(at)hogranch(dot)com> wrote:
> > one of my coworkers says he thought that 9.5 has some enhancements in
> > partitioning, but looking at the release notes I don't see anything
> specific
> > ? do BRIN's play into partitioned tables ?
> >
> > in our case, we partition very large 'event' tables by week with 6
> > month retention....
>
> BRIN can be seen as a form of "automatic partitioning", and I have seen it
> described as such in documents relating to the BRIN project, so perhaps
> that description has made its way further afield and that's maybe what your
> coworker heard about.
>
> If you view the inheritance partitioning feature as a method of
> eliminating scans of partitions which can be proved unneeded at planning
> time, then BRIN can eliminate blocks from a scan of a single relation (or
> rather "pages_per_range") during execution time. So I agree with the
> "automatic partitioning" description.
>
> --
> David Rowley http://www.2ndQuadrant.com/
> PostgreSQL Development, 24x7 Support, Training & Services
>
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--
*Melvin Davidson*
I reserve the right to fantasize. Whether or not you
wish to share my fantasy is entirely up to you.