Re: brin autosummarization -- autovacuum "work items"

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>
Cc: Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: brin autosummarization -- autovacuum "work items"
Date: 2017-03-31 18:49:19
Message-ID: 20170331184919.6eh3hdgskxjcnppt@alvherre.pgsql
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Here's a version of this patch which I consider final.

Thanks for your tips on using DSA. No crashes now.

I am confused about not needing dsa_attach the second time around. If I
do that, the dsa handle has been 0x7f'd, which I don't understand since
it is supposed to be allocated in TopMemoryContext. I didn't dig too
deep to try and find what is causing that behavior. Once we do, it's
easy to remove the dsa_detach/dsa_attach calls.

I added a new SQL-callable function to invoke summarization of an
individual page range. That is what I wanted to do in vacuum (rather
than a scan of the complete index), and it seems independently useful.

I also removed the behavior that on index creation the final partial
block range is always summarized. It's pointless.

Álvaro Herrera
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

Attachment Content-Type Size
brin-autosummarize-2.patch text/plain 31.1 KB

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