Upgradting standard version of Oracle 11g to Enterprise Edtion

I need to fo this in a complex envrionment and need to reduce risks as much as possible. What are the diffencies and waht do I need to watch out for.
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Enterprise Edition is a superset of standard.   So, compatibility wise, you should be able to upgrade with no problems.

 However, RAC is separately licensed in EE vs SE.

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RottneAuthor Commented:
It is a correct answer for a in a sense simple question. It could be added that good testing is still esential.
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