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Why Transaction Log Backup Chains Break

Tom Collins enumerates several reasons for a transaction log backup chain breaking:

The SQL Server transaction log backup chain aka log chain is the series of sequential transaction log backups related to a database. The log backups are related to each other and are represented through LSN . Breaking the transaction log chain will limit the restore point of the backups. 

Click through for four such reasons as well as a scenario explaining how it could happen.

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