While taking hot backup (begin end backup) what will happens back end?


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What does the no logging option do? Why would we use it? Why would we be careful of using it?

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What are the skills required for oracle dba?

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Explain dual table. Is any data internally stored in dual table. Lot of users is accessing select sysdate from dual and they getting some millisecond differences. If we execute select sysdate from emp; what error will we get. Why?

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Tell me about standby database? What should we watch out for?

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