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REASON

All SQL Server databases are susceptible to corruption, which can cause serious or even complete data loss in extreme circumstances. It is therefore important to verify the logical and physical integrity of databases on a regular basis by running DBCC CHECKDB. If a database has never been checked for consistency it is possible that corruption has already occurred.

RESOLUTION

If and when corruption is detected, the safest (and sometimes only) way to recover lost data is to restore from a backup. It's therefore a good practice to run DBCC CHECKDB at least often enough that should corruption be detected, your backup frequency and retention period will allow you to restore back to before the problem occurred.

Databases where DBCC CHECKFILEGROUP was run, may not cause an alert even though CHECKDB did not run. There is no reliable way to differentiate between the two commands using DBCC LastKnownGood.

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