Delayed Durability and other SQL Server components

How does Delayed Durability integrate with the components of SQL Server? We will have a brief discussion here on how Delayed Durability will work with some other components of SQL Server.

Let's start with the most important: crash recovery. You, as the DBA, have no control over crash recovery. Crash recovery is the process that brings the database into a consistent state after the system has crashed for whatever reason. It is possible that changed data pages have not been written or hardened to the data file. In previous versions of SQL Server, they would have been written and hardened to the log-file as part of the commit process. With Delayed Durability in SQL Server 2014, its possible, using asynchronous commit, that transactions have not been hardened to the transaction log on disk and as such these transactions will be lost even though a commit was issued. The database will still be in a consistent state but potentially data will be...