How to improve performance using Oracle Spatial

I need increase performance in my aplication.
It is using Oracle Spatial.
Could someone help me ?
All basic resources were applied.

I am talking about a big database with 100.000 lines with geometry datatype.
Using sdo_relate, sdo_join and others.
I think that database parameters must be reviews, Which ones ? PGA, SGA
Is there any in special ?


Thank you.
Eriovaldo

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