Microsoft SQL Server 2014 Unleashed

Transaction Logging and the Recovery Process

Every SQL Server database has its own transaction log that keeps a record of all data modifications in a database (for example, insert, update, delete) in the order in which they occur. This information is stored in one or more log files associated with the database. The information stored in these log files cannot be modified or viewed effectively by any user process.

SQL Server uses a write-ahead log. In full transaction durability mode, which is the default transaction mode, the buffer manager guarantees that changes are written to the transaction log before the changes are written to the database. The buffer manager also ensures that the log pages are written out in sequence so that transactions ...