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database s information or not pass a parameter and see information for all databases. However, if you want to see only databases that the login sue owns, or just see databases that are in a lower compatibility level, you cannot do it using the supplied stored procedure. Using the catalog views, these queries are straightforward:
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SELECT name FROM sys.databases WHERE suser_sname(owner_sid) ='sue'; SELECT name FROM sys.databases WHERE compatibility_level < 90;
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Metadata Wrap-Up
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Figure 1-1 shows the multiple layers of metadata available in SQL Server 2008, with the lowest layer being the system base tables (the actual catalog). Any interface that accesses the information contained in the system base tables is subject to the metadata security policies. For SQL Server 2008, that means that no users can see any metadata that they don t need to see or to which they haven t speci cally been granted permissions. (There are a few exceptions, but they are very minor.) The other metadata refers to system information not contained in system tables, such as the internal information provided by the Dynamic Management Objects. Remember that the preferred interfaces to the system metadata are the catalog views and system functions. Although not all the compatibility views, INFORMATION_SCHEMA views, and system procedures are actually de ned in terms of the catalog views, conceptually it is useful to think of them as another layer on top of the catalog view interface.
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Backward Compatible Views INFORMATION_SCHEMA Views
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Catalog Views Built-in Functions Metadata Security Layer
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SQL Server 2008 Catalog Persisted State
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Other Metadata
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FIGURE 1-1 Layers of metadata in SQL Server 2008
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Components of the SQL Server Engine
Figure 1-2 shows the general architecture of SQL Server, which has four major components. Three of those components, along with their subcomponents are shown in the gure: the relational engine (also called the query processor), the storage engine, and the SQLOS.
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SQL Server 2008 Architecture and Con guration
(The fourth component is the protocol layer, which is not shown.) Every batch submitted to SQL Server for execution, from any client application, must interact with these four components. (For simplicity, I ve made some minor omissions and simpli cations and ignored certain helper modules among the subcomponents.) The protocol layer receives the request and translates it into a form that the relational engine can work with, and it also takes the nal results of any queries, status messages, or error messages and translates them into a form the client can understand before sending them back to the client. The relational engine layer accepts T-SQL batches and determines what to do with them. For T-SQL queries and programming constructs, it parses, compiles, and optimizes the request and oversees the process of executing the batch. As the batch is executed, if data is needed, a request for that data is passed to the storage engine. The storage engine manages all data access, both through transaction-based commands and bulk operations such as backup, bulk insert, and certain DBCC commands. The SQLOS layer handles activities that are normally considered to be operating system responsibilities, such as thread management (scheduling), synchronization primitives, deadlock detection, and memory management, including the buffer pool.
Language Processing (Parse/Bind, Statement/Batch Execution) Metadata, Type System, Expression Services Query Optimization (Plan Generation, View Matching, Statistics, Costing) Query Execution (Query Operators, Memory Grants, Parallelism)
Utilities (DBCC, Backup/Restore, BCP, ...)
Storage Engine (Access Methods, Database Page Cache, Locking, Transactions, ...) SQLOS (Schedulers, Buffer Pool, Memory Management, Synchronization Primitives, ...)
FIGURE 1-2 The major components of the SQL Server Database Engine
Observing Engine Behavior
SQL Server 2008 includes a suite of system objects that allow developers and database administrators to observe much of the internals of SQL Server. These metadata objects, introduced in SQL Server 2005, are called Dynamic Management Objects. These objects include both views and functions, but the vast majority are views. (Dynamic Management Objects are frequently referred to as Dynamic Management Views (DMVs) to re ect the fact that most of the objects are views.) You can access these metadata objects as if they reside in the sys schema, which exists in every SQL Server 2008 database, but they are not real tables that are stored on disk. They are similar to the pseudotables used in SQL Server 2000 for observing the active processes (sysprocesses) or the contents of the plan
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