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The execution plan consists of two parts. One is reentrant and can be used concurrently by any number of processes. The other part contains the data context; that is, the parameters to be used during execution. Although this part can be reused, it cannot be used by another process concurrently, so more instances of this part will be created. The execution plan will be removed from the procedure cache when a process called lazywriter concludes that the execution plan has not been used for a while, or when the execution plan s dependent database objects are changed in any of the following ways:

Security does not have to be implemented on SQL Server. If the application is developed using three-tier architecture, objects can use roles, users, and other

The amount of data is significantly changed. Indexes are created or dropped. Constraints are added or changed.

Distribution statistics of indexes are changed. sp_recompile was explicitly called to recompile the stored procedure or trigger.

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If a dependent database object is deleted, the stored procedure will fail during execution. If it is replaced with a new object (new ObjectId) with the same name, the execution plan does not have to be recompiled and will run flawlessly. I was impressed with the way that lazywriter determines which execution plans are obsolete. Microsoft SQL Server 2000 contains a sophisticated emulation of the aging process. When SQL Server creates an execution plan, it assigns it a compilation cost factor. The value of this factor depends on the expense required to create the execution plan in terms of system resources. For example, a large execution plan might be assigned a compilation cost factor of 8, while a smaller one might be assigned a factor of 2. Each time the execution plan is referenced by a connection, its age is incremented by the value of the compilation cost factor. Thus, if the compilation cost factor of the execution plan is 8, each reference to the execution plan adds 8 to its age. SQL Server uses the lazywriter process to decrement the age of the execution plan. The lazywriter process periodically loops through the execution plans in the procedure cache and decrements the age of each execution plan by 1. When the age of an execution plan reaches 0, SQL Server deallocates it, provided that the system is in need of the resources and no connection is currently referencing the execution plan.

SQL Server is intelligent enough to recompile a stored procedure when a table referenced by that stored procedure changes. Unfortunately, SQL Server does not recompile when an administrator adds an index that might help execution of the stored procedure. The stored procedure will be recompiled only when the procedure cache is flushed (which usually happens only when SQL Server is restarted).

The relational engine uses OLE DB for most of its communication with the storage engine. The following description of that communication is adapted from the section titled Database Server in Books Online. It describes how a SELECT statement that processes data from local tables only is processed: 1. The relational engine compiles the SELECT statement into an optimized execution plan. The execution plan defines a series of operations against simple rowsets from the individual tables or indexes referenced in the SELECT statement. (Rowset is the OLE DB term for a result set.) The rowsets requested by the relational engine return the amount of data needed from a table or index to perform one of the operations used to build the SELECT result set. For example, this SELECT statement requires a table scan if it references a table with no indexes:

3:

To force compilation of a stored procedure, a DBA can use sp_recompile:

Figure 10-3

This task can be very tedious if many stored procedures and/or triggers depend on a table for which an index was added. Fortunately, it is possible to name the table for which dependent objects should be recompiled:

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