Fix Your Worst Transaction Rollback Nightmares with ADR

For decades, SQL Server’s recovery mechanism has relied on the classic ARIES model. While robust, its fundamental limitation is that recovery time is bound to the size of your oldest active transaction. If your engine crashes during a massive index rebuild or a multi-gigabit ETL batch, your database stays offline while SQL Server painstakingly processes the log.

Accelerated Database Recovery (ADR) shatters this paradigm by introducing a radically redesigned row-versioning framework. Instead of scanning the transaction log sequentially, the engine utilizes an internal Persisted Version Store (PVS) and a specialized, in-memory Secondary Log Stream (SLOG) to perform instantaneous logical reverts.

In this fast-paced, deep-dive session, we will peel back the covers of the SQL Server storage engine to see how ADR handles crash recovery, undo phases, and aggressive log truncation under heavy concurrent workloads.