As documented in other excellent articles, this comes with three main options for recovery: REPAIR_ALLOW_DATA_LOSS, REPAIR_FAST and REPAIR_REBUILD. This utility will perform systematic data integrity checks throughout the datafiles and identify areas of concern. The first, and the most well-known, is DBCC CHECKDB. the full backups include this corrupted data? DBCC CHECKDBįortunately, there's a few ways to identify corruption in the database. the error message wasn't a direct response to a very recent event, like disk failure) but instead has festered inside your database? What if (horror of horrors). What about configuration of the script to do this? What happens if one of those logs is also corrupt? And what happens if the corruption pre-dates the error message (i.e. One, what's your recovery time objective (RTO)? Is it, let's say, four hours? Are you sure you can perform 93 individual backups in four hours, over 20GB of data? What if you're using SATA drives - IOPS constraints will make this a close-run race. Restore of tail log up to the point of corruption (point in time recovery)īut wait - there's two things to consider.Restore of 4 transaction logs per hour multiplied by 23 hours = 92 individual logs.Tail log backup of all transactions since last transaction log backup.So what do you do? The first instinct is to think, 'Restore! Restore! Restore!' But in this scenario, this will involve the following steps as a minimum: As this sample error reports, there's a problem in the 'corruption_secondary.mdf' file (my second data file in this test database) at page 3:0, offset 000.000 (right at the beginning). It is clear that the SQL Server database integrity has been compromised. This error can be caused by many factors for more information, see SQL Server Complete a full database consistency check (DBCC CHECKDB). This is a severe error condition that threatens database integrity and must beĬorrected immediately. Messages in the SQL Server error log or system event log may provide more detail. It occurred during a read of page (3:0) in database ID 10 at SQL Server detected a logical consistency-based I/O error: unable to decrypt pageĭue to missing DEK.
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