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From: Bruce Momjian <[email protected]>
To: Amit Langote <[email protected]>
Cc: David Rowley <[email protected]>
Cc: Justin Clift <[email protected]>
Cc: Jonathan S. Katz <[email protected]>
Cc: [email protected]
Subject: Re: PostgreSQL 12: Feature Highlights
Date: Sat, 18 May 2019 09:24:28 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On Tue, May 14, 2019 at 09:19:45AM -0400, Bruce Momjian wrote:
> On Tue, May 14, 2019 at 06:25:43PM +0900, Amit Langote wrote:
> > Considering the quoted discussion here, maybe it's a good idea to note
> > that only the operations that need to touch a small number of partitions
> > are now processed efficiently, which covers both SELECT/UPDATE/DELETE that
> > benefit from improved pruning efficiency and INSERT that benefit from
> > improved tuple routing efficiency.  So, maybe:
> > 
> > 	Tables with thousands of child partitions can now be processed
> > 	efficiently by operations that only need to touch a small number
> >         of partitions.
> > 
> > That is, as I mentioned above, as opposed to queries that need to process
> > all partitions (such as, select count(*) from partitioned_table), which
> > don't perform any faster in v12 than in v11.  The percentage of users who
> > run such workloads on PostgreSQL may be much smaller today, but perhaps
> > it's not a good idea to mislead them into thinking that *everything* with
> > partitioned tables is now faster even with thousands of partitions.
> 
> Agreed, I changed it to your wording.

I tightened up the wording on this item, and removed 'touch' since that
could suggest 'write':

        Allow tables with thousands of child partitions to be processed
        efficiently by operations that only affect a small number of
        partitions.

-- 
  Bruce Momjian  <[email protected]>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

+ As you are, so once was I.  As I am, so you will be. +
+                      Ancient Roman grave inscription +

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