Re: COPY FREEZE and setting PD_ALL_VISIBLE/visibility map bits

On Tue, Feb 26, 2019 at 6:46 PM Simon Riggs  wrote:
>
> On Thu, 21 Feb 2019 at 15:38, Kuntal Ghosh  wrote:
>
>>
>> Thank you for the patch. It seems to me that while performing COPY
>> FREEZE, if we've copied tuples in a previously emptied page
>
>
> There won't be any previously emptied pages because of the pre-conditions required for FREEZE.
>
Right, I missed that part. Thanks for pointing that out. But, this
optimization is still possible for copying frozen tuples in a newly
created page, right? If current backend allocates a new page, copies a
bunch of frozen tuples in that page, it can set the PD_ALL_VISIBLE in
the same operation.



-- 
Thanks & Regards,
Kuntal Ghosh
EnterpriseDB: http://www.enterprisedb.com