From: | hubert depesz lubaczewski <depesz(at)depesz(dot)com> |
---|---|
To: | PG Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | What are multixactids? |
Date: | 2013-12-09 17:04:53 |
Message-ID: | 20131209170453.GA25701@depesz.com |
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Lists: | pgsql-hackers |
Hi,
when working on fixing the bug related to vacuum freeze, I found out
that there is something called "MultiXactId".
Searching docs showed that it is mentioned only once, in release notes
to 9.3.2:
http://www.postgresql.org/search/?u=%2Fdocs%2F9.3%2F&q=multixactid
What's more - I found that Peter Eisentraut already once asked about
them, and lack of documentation:
http://postgresql.1045698.n5.nabble.com/MultiXactId-concept-underdocumented-td5766754.html
So, my question is - what are multixactids, what are they used for,
where can I find any documentation/explanation/whatever?
It seems to be related in some way to the relfrozenxid/vacuum bug, but
I can't comprehend the relation without knowing what multixactid
actually is.
Best regards,
depesz
--
The best thing about modern society is how easy it is to avoid contact with it.
http://depesz.com/
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