Re: Encoded Vector Indexes

[Pete Hall <pbhall@xxxxxxxxxx>]

At 09:33 01/31/2001, Jim Oberholtzer wrote:

>Has anyone played with EVIs?  They look interesting and may be a good use
>for web applications that can sort/select by many different fields or
>anything using dynamic SQL.
>
>Yes I have.  They work best when built over data that would have a natural
>limit on the number of key entries in the table.  An example would be the
>state field or county.


...and they're especially helpful for ad-hoc joins with selection criteria 
referencing more than one table. The system can magically combine multiple 
EVIs and come up with the selection set. All you have to do is build an EVI 
over each of the candidate selection fields. Very slick (and fast).


Pete Hall
pbhall@execpc.com
http://www.execpc.com/~pbhall/

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