Is there any max character length for index usage ?

deleting this thread..
Edited by: OraDBA02 on Oct 3, 2012 2:32 PM

This is a fairly well documented issue. (At least, I documented it a few years ago in "CBO Fundamentals").
Oracle only considers the first few bytes of a character string when calculating selectivity, so you can get all sorts of anomalous results.
You could start by reading a couple of notes I wrote some time ago - this might give you a few pointers for your particular case:
http://jonathanlewis.wordpress.com/2010/10/05/frequency-histogram-4/
http://jonathanlewis.wordpress.com/2010/10/13/frequency-histogram-5/
Regards
Jonathan Lewis

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