Re: Unlogged tables, persistent kind

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От Leonardo Francalanci
Тема Re: Unlogged tables, persistent kind
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Msg-id 991879.62936.qm@web29012.mail.ird.yahoo.com
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Ответ на Unlogged tables, persistent kind  (Simon Riggs <simon@2ndQuadrant.com>)
Ответы Re: Unlogged tables, persistent kind  (Simon Riggs <simon@2ndQuadrant.com>)
Re: Unlogged tables, persistent kind  (Robert Haas <robertmhaas@gmail.com>)
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The only data we can't rebuild it's the heap. So what about an option for UNlogged indexes on a LOGged table? It would
alwayspreserve data, and it would 'only' cost a rebuilding of the indexes in case of an unclean shutdown. I think it
wouldgive a boost in performance for all those cases where the IO (especially random IO) is caused by the indexes, and
itdoesn't look too complicated (but maybe I'm missing something). 

I proposed the unlogged to logged patch (BTW has anyone given a look at it?) because we partition data based on a
timestamp,and we can risk loosing the last N minutes of data, but after N minutes we want to know data will always be
there,so we would like to set a partition table to 'logged'.  

Leonardo


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