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Message Posted: Thu, 06 Aug 2015 @ 08:23:50 GMT
In your case I think either a PPI on start_date or separate, single column NUSI's would give you benefits. If you use a NUSI on either of these columns then make them value-ordered NUSI's. I think PPI will be slightly better in that it is usually less overhead than a NUSI (disk space, processing cost).
If you built a composite NUSI then for your second example the NUSI is not going to be used - unless (possibly) you 'order by values' on start_date.
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