* Checkpoints commit all dirty pages to disk. Therefore the very last checkpoint is the true starting point for SQL Server to start recovery from, either by a restart or restore (crash of some type).

* SQL Server can perform the restart recovery on multiple databases at the same time, dependent on the number of threads it can spin up.

How to read and interpret the SQL Server log

* ROLLBACKx are often MUCH slower that the actual transaction due to the fact that the transaction likely is multi-threaded and ROLLBACKS are mostly single-threaded.

* KILLing an open transaction causes SQL Server to roll it back

Rollback: What happens when you KILL a session?

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