Galy Lee <[EMAIL PROTECTED]> writes:
> So I am thinking another way to perform vacuum. For example vacuum can
> be refined in a maintenance time frame like "VACUUM IN 6 HOURS", and
> then vacuum operation will be performed within the window. The delay
> time is adjusted internally to spread the disk I/O over the time frame.

And you will manage that how?  The total amount of work to be done is
quite unpredictable.

                        regards, tom lane

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