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1 recovery
"A phase of database startup that brings the database into a transaction-consistent state. Recovery can include rolling forward all the transactions in the log records (the redo phase) and rolling back uncommitted transactions (the undo phase), depending on how the database was shut down." -
2 recovery model
"A database property that controls the basic behavior of backup and restore operations for a database. For instance, the recovery model controls how transactions are logged, whether the transaction log requires backing up, and what kinds of restore operations are available." -
3 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. -
4 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." -
5 secondary database
"In log shipping, a read-only database that was created by restoring a full backup of the primary database (without recovery) on a separate server instance (the secondary server). Log backup from the primary database is restored at regular intervals onto the secondary database." -
6 undo phase
The phase during database recovery that reverses (rolls back) changes made by any transactions that were uncommitted when the redo phase of recovery completed. -
7 undo
The phase during database recovery that reverses (rolls back) changes made by any transactions that were uncommitted when the redo phase of recovery completed. -
8 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." -
9 mirroring
"Immediately reproducing every update to a read-write database (the principal database) onto a read-only mirror of that database (the mirror database) residing on a separate instance of the database engine (the mirror server). In production environments, the mirror server is on another machine. The mirror database is created by restoring a full backup of the principal database (without recovery)." -
10 log shipping
"Copying, at regular intervals, log backup from a read-write database (the primary database) to one or more remote server instances (secondary servers). Each secondary server has a read-only database, called a secondary database, that was created by restoring a full backup of the primary database without recovery. The secondary server restores each copied log backup to the secondary database. The secondary servers are warm standbys for the primary server." -
11 piecemeal restore
"A composite restore in which a database is restored in stages, with each stage corresponding to a restore sequence. The initial sequence restores the files in the primary filegroup, and, optionally, other files, to any point in time supported by the recovery model and brings the database online. Subsequent restore sequences bring remaining files to the point consistent with the database and bring them online." -
12 restore
"A multi-phase process that copies all the data and log pages from a specified backup to a specified database (the data-copy phase) and rolls forward all the transactions that are logged in the backup (the redo phase). At this point, by default, a restore rolls back any incomplete transactions (the undo phase), which completes the recovery of the database and makes it available to users." -
13 deferred transaction
A transaction that is not committed when the roll forward phase of recovery completes and that cannot be rolled back during database startup because data needed by roll back is offline. This data can reside in either a page or a file. -
14 redo phase
The phase during recovery that applies (rolls forward) logged changes to a database to bring the data forward in time. -
15 redo
The phase during recovery that applies (rolls forward) logged changes to a database to bring the data forward in time.
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