First of all thanks for all the responses. I am clear that the First point is right and SYBEX has made a mistake either "theoritically" or "English Language Based".


Originally posted by slimdave
I think you are getting distracted by semantics. Writing all dirty buffers to disk allows a checkpoint to be taken, and taking a checkpoint requires that all dirty buffers be written to disk. Both of these scenarios make perfect sense, so there oughtn't to be any confusion.
..Well.. again, you see you may derive your own way of understanding things to benefit your convinience of notions. But 'ENGLISH' remains the same. A statement of meaning can only be precise..it cannot be "Subjective" left to the imaginations of the reader. A "technical statement" ought to be precise and not poetry. I hope you will agree.

Your words of "Allows" and "Requires" are your imaginations to suit your notion, it has no bearing on what SYBEX has said as "A checkpoint occurs when the dirty buffers are written to the disk" . To me, I am in no-way supportive to this statement of SYBEX, regardless of how one would want to interpret based on their convinences. In My Honest Opinion, it's a GROSS MISTAKE on SYBEX's part of either "understanding the concepts" or "English Usage". Period.