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1 full recovery model
A database recovery mode that fully logs all transactions and retains all the log records until after they are backed up. The database can be recovered to the point of failure if the tail of the log is backed up after the failure. All forms of recovery are supported. -
2 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." -
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 data-link layer
"Layer two of the OSI model. A layer that packages raw bits from the physical layer into frames (logical, structured packets for data). This layer is responsible for transferring frames from one computer to another, without errors. After sending a frame, the data-link layer waits for an acknowledgment from the receiving computer."
См. также в других словарях:
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