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MSSQL Server Differential Backup Failure

Date 
Log Job History (TestDB_Maintenance_Plan.TestDB_Diff_Subplan)
Step ID 1
Server TestSRV
Job Name TestDB_Maintenance_Plan.TestDB_Diff_Subplan
Step Name TestDB_Diff_Subplan
Duration 00:00:05
Sql Severity 0
Sql Message ID 0
Operator Emailed 
Operator Net sent 
Operator Paged 
Retries Attempted 0

Message
Executed as user: TestSRV\SYSTEM. Microsoft (R) SQL Server Execute Package Utility Version 10.50.1600.1 for 64-bit Copyright (C) Microsoft Corporation 2010. All rights reserved. Started: 09:27:33 Progress: 2012-12-07 09:27:35.66 Source: {1F5637A5-DB54-422D-951C-AC4998857244} Executing query "DECLARE @Guid UNIQUEIDENTIFIER EXECUTE msdb..sp...".: 100% complete End Progress Error: Code: 0xD227A348 Source: TestDB Diff Back Up Database Task Execute SQL Task Description: Executing the query "BACKUP DATABASE [TestDB] TO DISK = N'E:\MSSQL\Bac..." failed with the following error: "Cannot perform a differential backup for database "TestDB", because a current database backup does not exist. Perform a full database backup by reissuing BACKUP DATABASE, omitting the WITH DIFFERENTIAL option. BACKUP DATABASE is terminating abnormally.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly. End Error DTExec: The package execution returned DTSER_FAILURE (1). Started: 09:27:33 Finished: 09:27:36 Elapsed: 2.949 seconds. The package execution failed. The step failed.

If you run into this error that's because since the last differential backup has been taken, there must be another task that ran a backup log with truncate_only or recovered the database. So the log chain was broken. You need to take another full backup and then differential backup.

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