From: | Leonardo Francalanci <m_lists(at)yahoo(dot)it> |
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To: | Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: switch UNLOGGED to LOGGED |
Date: | 2011-05-10 07:35:21 |
Message-ID: | 906765.25804.qm@web29001.mail.ird.yahoo.com |
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Thread: | |
Lists: | pgsql-hackers |
> Yes, that seems like a very appealing approach. There is plenty of
> bit-space available in xinfo, and we could reserve a bit each for
> nrels, nsubxacts, and nmsgs, with set meaning that an integer count of
> that item is present and clear meaning that the count is omitted from
> the structure (and zero). This will probably require a bit of tricky
> code reorganization so I think it should be done separately from the
> main patch.
Ok, I'll try and send a patch with this change only.
BTW xinfo is 32 bit long, but I think only 2 bits are used right now?
I think I can make it a 8 bits, and add another 8 bits for nrels,
nsubxacts, and nmsgs and the new thing. That should save
another 2 bytes, while leaving space for extention. Or we can make
it a 8 bits only, but only 2 bits would be left "empty" for future
extentions; I don't know if we care about it...
Leonardo
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