Disk size is drastically reducing after the Dense restructure

After Clearing empty blocks the number of blocks are coming down by 10% showing that empty blocks were existing in the database. At this point in time total size of .PAG file remains constant (Before and after clearing empty blocks).
We did a restructure of database the number of blocks remained constant but the .PAG file has drastically reduced to less than 50%.
We are trying to understand why would the 10% block reduction is casuing the disk size reduction by 50%.
Thanks for your inputs!
Edited by: user3942062 on Mar 14, 2013 3:31 AM

The .pag file contains free space, not just that left behind by CLEARBLOCK EMPTY but also where blocks have been modified and no longer fit back into their original slot (so Essbase has to expand the .pag file to fit them back somewhere else). For example, if a block is taking up 2K on disk but you then load additional data, the block's footprint on disk may increase to 3K. Essbase can't fit it back into its original 2K location, so it leaves that 2K chunk of the .pag file empty (at least for the time being) and finds 3K elsewhere.
Only restructuring the database physically releases this space.

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