Auditing tables - What are the best possible ways of doing it?

Hello Everyone,
DB version: 10g.
Brief description of the problem: Right, now I am working on an application which has a java frontend and oracle
backend. We have no access to the java code at all. So, it is a complete blackbox. . Just wondering, if I could go for a schema level trigger to know, which columns of which tables are altered upon some action at the frontend. Or, if I know the tables specifically, say tab A and tab B; Should I go for a row level trigger on them, instead of going for a
schema level trigger. Which approach will be the best? If possible, would you please point me to some code samples
for both of them.
Thanks.

http://www.oracle.com/pls/db102/search?remark=quick_search&word=audit&tab_id=&format=ranked

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