I just made an experiment:
created new web app created new site collection put there a doclib1 with 5 Gb of pdf documents checked size of content db in sql studio - it was 5.5 Gb with 300 Mb available (free, but reserved space, that can be redeemed with shrink operation)
Then i deleted doclib1 Then i cleaned recycle bin (2 level), so on this stage the data is totally deleted on site level with no restoration options
Checked the db - 5.5 Gb (which is normal) with 800 Mb available. Why 800 Mb and not 5 Gb ? Why i can redeem only 500 Mb in the end ?
Are sharepoint content dbs are even made for redeeming space after some of its contents are deleted ?
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