Re: HELP! Index Debate!

Wolfgang,

> as long as the leading columns are present in the where clause with an
> equal predicate, the index can be used. The first omission or non-equal
> predicate breaks the chain and only the part of the index up to that
column
> can be used.

Could you please elaborate what you meant by that? My understanding (and brief testing results) are that composite indexes can be used with inequality predicates (<, >, between, like) and even a missing predicate in between. Do you mean that normal index branch block traversing mechanism can't be used starting with omitted or non-equal predicate and starting from them leaf block linked list is read up to a value is found which doesn't match the last equality predicate?

Tanel.

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Tanel Poder
  INET: tanel.poder.003_at_mail.ee

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