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As described earlier, an expression evaluator is compiled for each object that contains computed columns or CLR UDTs. If the expression evaluator cannot be compiled, these columns cannot be consistency checked. The expression evaluator is called to evaluate persisted computed columns, or computed columns that exist in index records. It returns a value which is then compared against the persisted value in the data or index record. If the NULL status of the two values differs or a byte-comparison of the two values differs, error 2537 is returned. For UDT columns, the comparison is done within the expression evaluator. It is passed the entire record being checked and returns a value of True or False depending on the UDT comparison. It should be noted that the expression evaluator object is not thread-safe. This means that when DBCC CHECKDB is running in parallel across multiple processor cores (with one thread per processor core), only one processor core can access and use the expression evaluator at a time. Multiple processor cores can process pages from the same table with computed columns, so all the cores need access to the expression evaluator. There is, of course, internal

I won t put you to sleep with all the definitions for each building block. We re going to use or talk about most of them in our projects in this book, and I ll introduce the blocks when appropriate. Just consider Figure 1-1, and return to it when you need to do so. Two notes about this image are worth mentioning. First, look at the blue component on top of the concentric circles. Microsoft Visual Studio 2008 is not part of the .NET Framework, but it touches the .NET Framework at all levels. With Visual Studio 2008, you can develop applications that take advantage of all the components of the .NET Framework. Second, notice that the CLR, among other components, is at the center of the circles. The CLR is a crucial part of the foundation because it s the engine that loads and manages the execution of source code.

synchronization to prevent this and inevitably, one or more processor cores may have to wait for access. As is the case with any mutual exclusion mechanism, this could affect the performance of heavily loaded systems with a large number of computed columns or CLR UDTs in the schema.

There are three checks performed here:

XML Linking Language (XLink)

Variable-length columns that are NULL must not have a nonzero data length. If this check fails, error 7961 is reported. A column that was created as NOT NULL cannot have a NULL value. If this check fails, error 8970 is reported. A column cannot be longer than the maximum in-row length as de ned by its metadata. If this check fails, error 2537 is reported.

Data purity checks check whether the value of the column is within any bounds de ned for the column s data type. An example is a corrupt SMALLDATETIME column value that had a minutes past midnight subvalue of 1440 or more into the next day. As is documented in SQL Server Books Online, in versions of SQL Server prior to SQL Server 2005, it was possible to import out-of-bounds data values into a database. In SQL Server 2005 and SQL Server 2008, this is no longer possible. SQL Server 2005 introduced the concept of a database being pure in other words, there are no out-of-bounds data values in the database. Pure databases have the data purity checks run by default, and they cannot be disabled. Databases created on SQL Server 2008 are deemed pure from creation. Databases created on SQL Server 2005 are also deemed pure and remain so when upgraded to SQL Server 2008. Databases that are impure do not have the data purity checks run by default they must be speci cally requested with the WITH DATA_PURITY option. An impure database is one that was created before SQL Server 2005, has been upgraded to SQL Server 2008, and has not had the data purity checks run without errors. Once data purity checks have been run without errors, the database is irrevocably switched to being pure. A database s purity status is stored in the boot page. Table 11-2 below lists some of the SQL Server data types and the data purity validations that are performed for them.

What Is C#

11

TABLE 11-2