In modern history, the end of the early period falls in the late eighteenth century, as an Age of Revolutions dawns, beginning with those in North America and France.n the early modern period, the Holy Roman Empire was a union of territories in Central Europe under a Holy Roman Emperor. The first emperor of the Holy Roman Empire was Otto I. The last was Francis II, who abdicated and dissolved the Empire in 1806 during the Napoleonic Wars.
Latches are internal to the SQL engine and are used to provide memory consistency, whereas locks are used by SQL Server to provide logical transactional consistency. Above answer is taken from the old, but extremely relevant white paper written in the year 2011.
Types of the Latch: Buffer (BUF) Latch. Used to synchronize access to BUF structures and their associated database pages. Buffer âIOâ Latch. A subset of BUF latches used when the BUF and associated data/index page is in the middle of an IO operation (Reading page from disk or writing page to disk). Non-Buffer (Non-BUF) Latch These are latches that are used to synchronize general in-memory data structures generally used by queries/tasks executed by parallel threads, auto grow operations , shrink operations etc.