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From: Amit Langote <[email protected]>
To: Bruce Momjian <[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: Wed, 15 May 2019 09:34:10 +0900
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On 2019/05/14 22:19, 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.

Thank you.

Regards,
Amit

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