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This statement will recompile all triggers and stored procedures that depend on the Orders table. When a stored procedure or a trigger is specified as a parameter, only that stored procedure or trigger will be recompiled. If you use a table or a view as a parameter, all dependent objects will be recompiled. A developer might also decide to recompile a stored procedure each time it is used. A typical example is when a stored procedure is based on a query, the execution and performance of which depend on the value used as a criterion. We discussed such an example earlier in the section Autoparameterization. In that example, when a user requests orders from the USA, the selectivity of the index might be such that it is better for the query to do a table scan. If a user requests orders from a country that rarely appears in the particular database, the query engine might decide to use the index. To force SQL Server to evaluate these options every time, the developer should use the With Recompile option while designing the stored procedure:

Create Procedure prListOrders @Country char(3) With Recompile as Select * from Orders where Country = @Country

It is also possible to force recompilation of a stored procedure during execution. The user/developer uses the With Recompile option to achieve this end:

Stored procedures are persistent database objects, and Microsoft SQL Server stores them in system tables to preserve them when their execution plan is removed from the procedure cache or while SQL Server is shut down. When the Create Procedure statement is executed, Microsoft SQL Server creates a new record in the sysobjects table of the current database (see Figure 3-2).

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security features of Microsoft Transaction Server (on Windows NT) or Component Services (in Windows 2000) to implement security. Security is sometimes also implemented inside the client application. In both cases, database access is often accomplished through a single database login and user. Such a user is often called a proxy user.

Figure 3-2.

3:

This system table contains all types of database objects; it is sometimes useful to filter it by object type using the xtype field. The source code of the stored procedure is (usually) recorded in the syscomments system table. To see the source code, execute sp_helptext, or query the syscomments system table directly (see Figure 3-3). The source code is stored in a field named text. The datatype of this field is varchar(8000). Fortunately, this does not mean that stored procedures are limited to 8,000 characters. If the stored procedure is larger than 8,000 characters, SQL Server allocates additional records with an incremented colid field. Since this field is declared as smallint, a stored procedure can be 32K * 8,000 bytes 250MB long. In versions before SQL Server 2000 and SQL Server 7.0, colid was byte and text was varchar(255), so stored procedures were limited to 255 * 255 64KB.

Figure 3-3.

A developer can hide the source code for a stored procedure if he or she encrypts it during creation. After he or she creates the stored procedure With Encryption, none of the users (not even the system administrator) will be able to see it on the server. Keep in mind that you can (and should) keep source code in a separate external script file.

NOTE: Before this feature was introduced in SQL Server, developers achieved the same effect by setting the syscomments..text associated with the stored procedure to null. SQL Server was able to run the stored procedure without any problem. Unfortunately, this solution caused problems during upgrades from one version of SQL Server to another. Setup programs were expecting to use the text of the stored procedures to recompile them in the new environment. To solve that problem, Microsoft has included the With Encryption clause in the statement for creating a stored procedure. Setup programs will be able to upgrade stored procedures hidden in this manner.

2. The relational engine implements the table scan by requesting one rowset containing all the rows from ScanTable. This next SELECT statement needs only information available in an index:

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