Re: Automatic free space map filling

From: Christopher Browne <cbbrowne(at)acm(dot)org>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Automatic free space map filling
Date: 2006-03-04 02:53:47
Message-ID: 871wxiq5s4.fsf@wolfe.cbbrowne.com
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Centuries ago, Nostradamus foresaw when ZeugswetterA(at)spardat(dot)at ("Zeugswetter Andreas DCP SD") would write:
>> > But what about index clearing? When do you scan each index?
>>
>> At the end of each iteration (or earlier, depending on
>> maintenance_work_mem). So for each iteration you would need
>> to scan the indexes.
>>
>> Maybe we could make maintenance_work_mem be the deciding
>> factor; after scanning the indexes, do the release/reacquire
>> locks cycle.
>
> But you could do the indexes first and remember how far you can
> vacuum the heap later.

But the indexes _can't_ be done first; you _first_ need to know which
tuples are dead, which requires looking at the table itself.
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