Greg Stark wrote:

clustering...
That will only help if you're often retrieving moderately large result sets by
one particular index. If you normally only retrieve one record at a time or
from lots of different indexes then it probably won't really make much
difference.

It'll also help for columns whose values are related in some way.

For example, clustering a table of addresses based on "zip code"
will help lookups based on city or county or state (presumably
because all the disk pages for a given city will be grouped
together within the disk pages for the zip codes within the city).

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