Kirk, I think you remember the right discussion. Yes, versioning
can go wild, I was hoping we will be able to contain it
through planned releases (twice per year). I don't think we
have many other options.
Jacek
Kirk Borne wrote:
I seem to recall an e-mail storm a few months ago regarding
this versioning of database updates, in order to preserve
every instance of every record. Maybe I am remembering the
wrong discussion. Is this enormously difficult, or a massive
storage hog, or can't we just update the object table with
the latest and best values?
- Kirk
Date: Fri, 18 Aug 2006 05:42:41 -0700
From: Tim Axelrod <[EMAIL PROTECTED]>
Subject: Re: [LSST-data] Re: cpu for queries
To: Jacek Becla <[EMAIL PROTECTED]>
Cc: LSST Data Management <[email protected]>, [EMAIL PROTECTED]
Jacek,
Ouch! I had forgotten that you wanted to do this. I'm afraid this
makes more than just the alertid proposal unworkable. The whole concept
of having summary information for the object, such as a wavelet
decomposition of its lightcurve or even the mean magnitude, that is
updated as we go along is gone too. Living with this would be very
difficult! What alternatives do we have?
Tim
Jacek Becla wrote:
Kirk, Ani
There is one small complication with keeping the most recent
alertid for each Object: it requires updating existing rows.
It would be nice to have the design of largest tables such that
each row is written one, and kept read-only after that.
Such approach guarantees reproducibility, and make it more
manageable (easier to replicate and distribute).
Changes/updates would be done through versioning, but
I'm not sure it is worth using versioning in this case.
Jacek
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-----------------------------------------------------------------------------
Dr. Kirk D. Borne
NASA Goddard Space Flight Center, SSDOO Program Manager, QSS Group Inc.
and George Mason University, Associate Research Professor, College of Science
<mailto:[EMAIL PROTECTED]> Tel. +1-301-286-0696 Fax: 301-286-1771
Staff page: http://rings.gsfc.nasa.gov/~borne/
US Virtual Observatory: http://www.us-vo.org/
Large Synoptic Survey Telescope: http://www.lssto.org/
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