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Backup and Recovery
Backup and recovery processes are critical for data protection, ensuring that data can be restored after physical or logical failures.
1. Backup Strategies
Definition: Backup strategies involve creating copies of data that can be used to restore the original after a data loss event.
Example:
-- Creating a full database backup
BACKUP DATABASE YourDatabase TO DISK = 'C:\Backups\YourDatabase.bak';
A full database backup creates a complete copy of the database at a point in time.
1.1 Restoring Databases
Definition: Restoring databases involves returning data to a previous state by using data from a backup.
Example:
-- Restoring a database from a backup file
RESTORE DATABASE YourDatabase FROM DISK = 'C:\Backups\YourDatabase.bak';
This command restores the YourDatabase from a backup file, bringing all data back to the state when the backup was taken.
1.2 Point-in-Time Recovery
Definition: Point-in-time recovery allows the database to be restored to a specific point in time, usually before a failure or corruption occurred.
Example:
-- Performing a point-in-time recovery
RESTORE DATABASE YourDatabase FROM DISK = 'C:\Backups\YourDatabase.bak'
WITH STOPAT = '2023-07-01T14:00:00';
This command restores the database to the state it was at a specific time, useful for recovering from errors that occurred after that time.