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SQL logging

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I have some basic questions since it has been a while I have been dealing with logs.
Fully logged operations can be restored to some point in time. I guess it restores to some point in time to all committed transactions(it cannot restore in the middle of transaction since nobody would commit it). So, how bulk insert can be fully logged since you cant jump in the middle of the insert transaction? Or I'm wrong?

"Minimally logged operations log extent allocations"
What that exactly means? Extent just holds current data. So, if we insert some rows in table, and it is minimally logged, we don't know the state of the table before insert(since extents only holds current state).If we rollback, how can we get previous state then?


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