Question : Search CLOB's

I am using the dbms_clob.instr function to search through a clob column. Is this the best approach? I also need to use something similar to the UPPER function. How do I do that? Any ideas are welcome.
I need to search through some 20 Million rows. I am running Oracle 8.1.7.

Thanks;

Answer : Search CLOB's

Have you considered Oracle Text?  It may be time consuming to maintain and set up, but it should give you better results.  In addition, Oracle Text can be set up to do case insensitive searches.