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Re: feedback about a document on data storage and how to track space allocation

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What you are seeing here is an allocation page.  Every 256 pages is an allocation unit and the first page of the allocation unit is the allocation page itself (object id 99), which holds 32 extent records that record which object the 32 extents in the allocation unit are allocated to, and which pages are in use.

 

The first extent is called a "short extent" because it only has 7 pages available to hold object days, the first page of the first extent is used up by this allocation page.

 

If the page number is evenly divisible by 256, it is an allocation page.


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