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What are the valid Oracle database schemas?

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What are the valid Oracle database schemas?

(a) Logical Schema

(b) Physical Schema

(c) Logical and Physical Schema

(d) None of the Mentioned

I had been asked this question in unit test.

The query is from Databases and Instances topic in chapter Oracle Database 11g Architecture Options of Oracle

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Right answer is (c) Logical and Physical Schema

The best explanation: Oracle databases has two schema level logical and physical.

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