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When anyone mentions consistency checking a Microsoft SQL Server database, the rst thing that comes to mind is DBCC. In SQL Server 7.0, DBCC stood for Database Consistency Checker, but Microsoft changed the de nition in the next release, SQL Server 2000, to Database Console Commands. This change re ected the fact that the DBCC command family had grown to do much more than just checking consistency, and also was intended to help dispel the perception that SQL Server databases required regular consistency checking because SQL Server itself caused corruption. Although SQL Server itself does not cause database corruptions, I/O subsystems (all the software and hardware between the SQL Server buffer pool and the metal oxide of the disk drives) do cause the overwhelmingly vast majority of corruptions. For this reason, the common wisdom is that it is prudent to perform regular consistency checking because all database servers have an I/O subsystem of some sort. The de nition of regular is a question I am often asked, and it really depends on the situation and how con dent you are with the integrity of your I/O subsystem. I would say that in general, performing a consistency check once a week would be acceptable. Consistency checking is the process of examining the physical and logical structure of the database to make sure that there are no corruptions that could prevent the storage engine from being able to process part of the database or could lead to some incorrect behavior. Some simple examples are
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A persisted computed column where the persisted value has been corrupted such that it no longer matches the result of the computation A data page where the page ID in the page header is incorrect An index where the key order of records is incorrect
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The consistency checks in SQL Server have evolved signi cantly since the SQL Server 7.0 days, when they used to run of ine (that is, table locks were required). SQL Server 2000 saw the advent of consistency checks being online by default, with a new, highly ef cient mechanism for scanning the database. During SQL Server 2005, the consistency checking and repair code inside the storage engine was signi cantly rewritten and enhanced. This was done to cope with the plethora of new SQL Server features and rewritten subsystems and to increase the performance, reliability, and functionality of the consistency checks and repairs themselves. SQL Server 2008 added new functionality and further tweaks for performance and scalability.
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The most comprehensive way to perform consistency checks on a database is to use the DBCC CHECKDB command. The major steps of DBCC CHECKDB are as follows: 1. Create a transactionally consistent, static view of the database. 2. Perform low-level consistency checks of the critical system catalogs. 3. Perform allocation consistency checks of the database. 4. Perform consistency checks of each table in the database. 5. So long as no problems were found in the previous steps, the following cross-table consistency checks are performed:
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Perform consistency checks of Service Broker metadata. Perform consistency checks between various system catalogs. Perform consistency checks of indexed views. Perform consistency checks of XML indexes. Perform consistency checks of spatial indexes.
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6. Output results. Repairs are carried out at various steps if necessary, but only if the user speci ed a repair option. In this chapter, I explain how the internals of DBCC CHECKDB work in SQL Server 2008, based on the steps I ve listed here. For each of the options that can be speci ed, I ll describe how it affects the behavior of DBCC CHECKDB. Finally, I explain how repair works and about the other DBCC consistency-checking commands.
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