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The amount of data is significantly changed. Indexes are created or dropped. Constraints are added or changed.
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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.
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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).
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To force compilation of a stored procedure, a DBA can use sp_recompile:
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Exec sp_recompile prListOrders
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:
Exec sp_recompile Orders
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
The execution plan of a stored procedure created in this manner will not be cached on SQL Server.
SQL Server 2000 Stored Procedure Programming
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:
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