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A transaction commits as soon as its commit log record is written to stable storage at the primary site. This is

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A transaction commits as soon as its commit log record is written to stable storage at the primary site. This is

(a) One Safe

(b) Two Safe

(c) Two-very Safe

(d) Very Safe

I have been asked this question in my homework.

Question is from Remote Backup Systems in section Recovery System of Database Management

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Correct option is (a) One Safe

The explanation is: The problem with this scheme is that the updates of a committed transaction may not have made it to the backup site, when the backup site takes over processing.

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