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1 simple recovery model
"A database recovery mode that minimally logs all transactions sufficiently to ensure database consistency after a system crash or after restoring a data backup. The database is recoverable only up to the time of its most recent data backup, and restoring individual pages is unsupported." -
2 log backup
A backup of transaction logs that includes all log records not backed up in previous log backups. Log backups are required under the full and bulk-logged recovery models and are unavailable under the simple recovery model. -
3 log chain
"A continuous sequence of transaction logs for a database. A new log chain begins with the first backup taken after the database is created, or when the database is switched from the simple to the full or bulk-logged recovery model. A log chain forks after a restore followed by a recovery, creating a new recovery branch." -
4 contract
"The behavior and state that a class provides, which is matched with what a client of that class can expect to hold. A contract is expressed partly by the signatures for all public fields, methods, properties, and events of that class. This is augmented by a description (usually in simple descriptive text) of what each field or property represents, together with what each method does. In the.NET Framework add-in programming model, a non-versioning interface that defines the methods and specifies the data types for transferring data over the communication pipeline between the host and the add-in. The contract is in the middle of the communication pipeline between the add-in and the host. The contract assembly is loaded into the application domains of both the add-in and the host."
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