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The current copy of the database is identified by a pointer, called ____________ which is stored on disk.

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The current copy of the database is identified by a pointer, called ____________ which is stored on disk.

(a) Db-pointer

(b) Update log

(c) Update log records

(d) All of the mentioned

I had been asked this question in unit test.

I would like to ask this question from Recovery in chapter Recovery System of Database Management

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The correct answer is (a) Db-pointer

To explain: Any page which is not updated by a transaction is not copied, but instead the new page table just stores a pointer to the original page.

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