Transaction processing
No matter what concurrency model you’re working with, that you have an understanding of transactions is crucial. A transaction is the basic unit of work in SQL Server. Typically, it consists of several SQL commands that read and update the database, but the update isn’t considered final until a COMMIT command is issued (at least for an explicit transaction). In general, when discussing a modification operation or a read operation, this chapter is talking about the transaction that performs the data modification or the read, which isn’t necessarily a single SQL statement. The expression writers will block readers means that as long as the transaction that performed the write operation is active, no other process can read ...
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