Re: HOT chain validation in verify_heapam()

From: Andres Freund <andres(at)anarazel(dot)de>
To: pgsql-hackers(at)lists(dot)postgresql(dot)org, Peter Geoghegan <pg(at)bowt(dot)ie>
Cc: Himanshu Upadhyaya <upadhyaya(dot)himanshu(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Aleksander Alekseev <aleksander(at)timescale(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: HOT chain validation in verify_heapam()
Date: 2022-11-10 02:10:49
Message-ID: CFC156C2-E5B8-4975-84BC-A15A08A91521@anarazel.de
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Hi,

And thinking about it, it'd be quite bad if the horizon worked that way. You can easily construct a workload where every single xid would "skewer" some chain, never allowing the horizon to be raised.

Andres
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Sent from my Android device with K-9 Mail. Please excuse my brevity.

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