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When you issue a backup instruction, the database may be in use by many people. If you later need to use your backup to restore your database, you need to know what information has been backed up, and what has not.
The database server performs a backup as follows:
The backup includes all operations recorded in the transaction log before the final page of the log is read. This may include instructions issued after the backup instruction was issued.
The backup copy of the transaction log is generally smaller than the online transaction log. The database server allocates space to the online transaction logs in multiples of 64 KB, so the transaction log file size generally includes empty pages. However, only the non-empty pages are backed up.
For more information about renaming and truncating the transaction log, see Designing backup procedures.
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