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Microsoft SQL Server 2008 Internals
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Although the catalog views are the recommended interface for accessing the SQL Server 2008 catalog, other tools are available as well.
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Information schema views, introduced in SQL Server 7.0, were the original system table independent view of the SQL Server metadata. The information schema views included in SQL Server 2008 comply with the SQL-92 standard and all these views are in a schema called INFORMATION_SCHEMA. Some of the information available through the catalog views is available through the information schema views, and if you need to write a portable application that accesses the metadata, you should consider using these objects. However, the information schema views only show objects that are compatible with the SQL-92 standard. This means there is no information schema view for certain features, such as indexes, which are not de ned in the standard. (Indexes are an implementation detail.) If your code does not need to be strictly portable, or if you need metadata about nonstandard features such as indexes, legroups, the CLR, and SQL Server Service Broker, we suggest using the Microsoft-supplied catalog views. Most of the examples in the documentation, as well as in this and other reference books, are based on the catalog view interface.
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Most SQL Server system functions are property functions, which were introduced in SQL Server 7.0 and greatly enhanced in SQL Server 2000. SQL Server 2005 and 2008 have enhanced these functions still further. Property functions give us individual values for many SQL Server objects and also for SQL Server databases and the SQL Server instance itself. The values returned by the property functions are scalar as opposed to tabular, so they can be used as values returned by SELECT statements and as values to populate columns in tables. Here is the list of property functions available in SQL Server 2008:
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SERVERPROPERTY COLUMNPROPERTY DATABASEPROPERTY DATABASEPROPERTYEX INDEXPROPERTY INDEXKEY_PROPERTY OBJECTPROPERTY OBJECTPROPERTYEX SQL_VARIANT_PROPERTY FILEPROPERTY
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SQL Server 2008 Architecture and Con guration
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FILEGROUPPROPERTY TYPEPROPERTY CONNECTIONPROPERTY ASSEMBLYPROPERTY
The only way to nd out what the possible property values are for the various functions is to check SQL Server Books Online. Some of the information returned by the property functions can also be seen using the catalog views. For example, the DATABASEPROPERTYEX function has a property called Recovery that returns the recovery model of a database. To view the recovery model of a single database, you can use the property function as follows:
SELECT DATABASEPROPERTYEX('msdb', 'Recovery');
To view the recovery models of all our databases, you can use the sys.databases view:
SELECT name, recovery_model, recovery_model_desc FROM sys.databases;
Note Columns with names ending in _desc are the so-called friendly name columns, and they are always paired with another column that is much more compact, but cryptic. In this case, the recovery_model column is a tinyint with a value of 1, 2, or 3. Both columns are available in the view because different consumers have different needs. For example, internally at Microsoft, the teams building the internal interfaces wanted to bind to more compact columns, whereas DBAs running adhoc queries might prefer the friendly names. In addition to the property functions, the system functions include functions that are merely shortcuts for catalog view access. For example, to nd out the database ID for the AdventureWorks2008 database, you can either query the sys.databases catalog view or use the DB_ID() function. Both of the following SELECT statements should return the same result:
SELECT database_id FROM sys.databases WHERE name = 'AdventureWorks2008'; SELECT DB_ID('AdventureWorks2008');
System Stored Procedures
System stored procedures are the original metadata access tool, in addition to the system tables themselves. Most of the system stored procedures introduced in the very rst version of SQL Server are still available. However, catalog views are a big improvement over these procedures: you have control over how much of the metadata you see because you can query the views as if they were tables. With the system stored procedures, you basically have to accept the data that it returns. Some of the procedures allow parameters, but they are very limited. So for the sp_helpdb procedure, you can pass a parameter to see just one
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