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Note These checks are not run on the tempdb database.
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Even though an indexed view is a rst-class object in the database, it is stored as if it were an internal table with a clustered index, so its physical structure is checked for corruptions as part of the per-table consistency checks. Those consistency checks do not check that the contents of the indexed view match the view de nition (that is, that the internal table does not have any extra or missing rows).
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Microsoft SQL Server 2008 Internals
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The simple way to describe the indexed view consistency check is that it uses the indexedcview de nition (which is stored in the system catalogs) to generate a temporary copy of the indexed view. It then uses the query processor to run two left-anti-semi-joins between the actual indexed view and the temporary indexed view. This query reports any missing or extra rows in the actual indexed view. In reality, the temporary copy of the indexed view may not actually be created in its entirety it depends which query plan the query processor uses when running the query. The query that DBCC CHECKDB uses is similar to the one used for the nonclustered index deep-dive cross-checking that was discussed earlier. The query format is
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SELECT <identifying columns of missing rows> FROM <materialize the view temporarily> tOuter WITH (NOEXPAND) WHERE NOT EXISTS ( SELECT 1 FROM <actual view> tInner WITH (INDEX = 1) WHERE ( ([tInner].<view columns> = [tOuter].<view columns>) OR ([tInner].<view columns> IS NULL AND [tOuter].<view columns> IS NULL) ) ) UNION ALL SELECT <identifying columns of extra rows> FROM <actual view> tOuter WITH (INDEX = 2) WHERE NOT EXISTS ( SELECT 1 FROM <materialize the view temporarily> tInner WITH (NOEXPAND) WHERE ( ([tInner].<view columns> = [tOuter].<view columns>) OR ([tInner].<view columns> IS NULL AND [tOuter].<view columns> IS NULL) ) )
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The NOEXPAND hint used in the query instructs the query processor to perform an index scan of the indexed view rather than expanding it into its component parts. Any extra rows in the indexed view are reported as 8907 errors and any missing rows are reported as 8908 errors. This check can be very time- and space-consuming. The more complex the indexedcview de nition, and the larger the table(s) over which it is de ned, the longer it takes to materialize a temporary copy of the indexed view and the more likely it is to take up space in tempdb. This check is not performed by default in SQL Server 2008 and must be enabled using the EXTENDED_LOGICAL_CHECKS option.
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A primary XML index is stored as an internal table with a clustered index. A secondary XML index is stored as a nonclustered index on the primary XML index internal table. The consistency
11
DBCC Internals
checks must validate that the XML indexes contain an accurate shredded representation of the XML values in the user table. The mechanism for doing this is similar to that for the indexed-view consistency checks and can be visualized using the same style of query, although a T-SQL query is not used. In this case, the two left-anti-semi-joins can be thought of as between the actual XML index and a temporary copy of the XML index generated by the XML subsystem. Any extra rows in the XML index are reported as 8907 errors and any missing rows are reported as 8908 errors. This check can be very costly to run. The more complex the XML schema and the larger the XML column values, the longer it takes to generate the temporary copy of the XML index, and the more likely that it takes up space in tempdb. This check is not performed by default in SQL Server 2008 and must be enabled using the EXTENDED_LOGICAL_CHECKS option.
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