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Re: Re: GiST optimizing memmoves in gistplacetopage for fixed-size updates [PoC] - Mailing list pgsql-hackers

From Michael Paquier
Subject Re: Re: GiST optimizing memmoves in gistplacetopage for fixed-size updates [PoC]
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Msg-id CAB7nPqTpyxxVgtbGtDcMFV07pEqn6h+iBNdPbHSsLA-WSOdjsQ@mail.gmail.com
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In response to Re: Re: GiST optimizing memmoves in gistplacetopage for fixed-size updates [PoC]  (Andrew Borodin <borodin@octonica.com>)
Responses Re: Re: GiST optimizing memmoves in gistplacetopage for fixed-size updates [PoC]  (Andrew Borodin <borodin@octonica.com>)
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On Fri, Jul 8, 2016 at 2:00 PM, Andrew Borodin <borodin@octonica.com> wrote:

(Please top-post on threads, this is annoying)

> One more thing came to my mind:
> WAL records done by the GiST before patch will corrupt GiST after
> patch if replayed.
> Is it a problem? May be it's prevented on some higher level?

If a feature changes the shape of WAL records, XLOG_PAGE_MAGIC is
bumped to prevent any problems.
-- 
Michael

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