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Data & Analytics · Advanced

Transaction Log Backup

A backup of the transaction log records since the last log backup, enabling point-in-time recovery and freeing log space.

Definition

Restoring requires the last full backup, optionally the latest differential, and then every log backup in sequence. A tail-log backup captures records not yet backed up before restoring after a failure.

Example

BACKUP LOG Sales TO DISK = 'sales_log.trn';

Exam tip

The restore sequence is full, then differential, then each log backup in order, recovering only after the last one.

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