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