The so-called overall architecture here refers to the components and mechanisms necessary for the normal work and operation of the SQL Server database system. Generally speaking, this mainly includes instances (Instance) and databases (Database). On this basis, it is further divided. The instance is composed of relevant memory areas and service threads on the server; the database includes various related files on the operating system. The above-mentioned relevant memory areas, service threads and files can be further subdivided. Following this sequence and logic, the overall architecture of the SQL Server database system will be explained step by step.
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Examples
An instance, that is, a database instance, consists of a set of memory structures and threads on the server (because SQL Server for Windows is a thread model, and because this book is written based on SQL Server 2012+ for Windows, it is collectively referred to as SQL Server throughout. No more details) to support and complete the normal operation and operation of the database, which mainly includes the following components.