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From "Mattmann, Chris A (388J)" <chris.a.mattm...@jpl.nasa.gov>
Subject Re: ColumnBasedDatabase
Date Fri, 24 Jun 2011 05:36:49 GMT
Hi Michael,

On Jun 23, 2011, at 9:36 AM, Starch, Michael D (388L) wrote:

> Brian Foster, Developers,
> This question is regarding the work I am doing to develop the column based database.
> As I understood it we created views joining the three tables (Metadata, Reference, XREF)
so that accesses to this data was at one central point,  and the db handled the join.
> As of now the code only uses the view to get a list of distinct productid (which could
be done easily with out the view) and where I believed the views would help, the tables are
accessed individually in sequence.  
> Is this a result of unfinished migration to using views? or is there some issue with
using the views that I am missing.
> Was the code designed to handle multiple references per product?  As I understand it
it is not...but I could be mistaken on this point.  If it does not handle them, it should,
correct (for hierarchical types)?

+1. The code should work for hierarchical types as well (aka multiple refs per product, and
refs heirarchically organized within a particular directory structure).


Chris Mattmann, Ph.D.
Senior Computer Scientist
NASA Jet Propulsion Laboratory Pasadena, CA 91109 USA
Office: 171-266B, Mailstop: 171-246
Email: chris.a.mattmann@nasa.gov
WWW:   http://sunset.usc.edu/~mattmann/
Adjunct Assistant Professor, Computer Science Department
University of Southern California, Los Angeles, CA 90089 USA

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