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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. If a dependent database object is deleted, the stored procedure will fail during execution. If it is replaced with a new object (new object identification number) with the same name, the execution plan does not have to be recompiled and will run flawlessly. Naturally, if the structure of the dependent object is changed so that objects that the stored procedure is referencing are not present or not compatible any more, the stored procedure will fail, resulting in a run-time error.

In the following example, we first create a new table called MyEquipment. We populate it with Make and Model information from the Equipment table, and finally we create a trigger. The trigger is named trMyEquipment_D and is associated with the MyEquipment table. It is fired after a Delete statement is executed against the table. Its function is very simple it notifies the user regarding actions and the number of records that have been deleted.

Create Table MyEquipment (Id int identity, Description varchar(50)) GO -- populate table Insert MyEquipment(Description)

9:

Select Make + ' ' + Model from Equipment GO Create Trigger trMyEquipment_D On dbo.MyEquipment After Delete As Print 'You have just deleted ' + Cast(@@rowcount as varchar) + ' record(s)!' Go -- For Delete

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depending on system activity and configuration. A pool of threads handles each of the networks that SQL Server simultaneously supports, another thread handles database checkpoints, another handles the lazywriter process, while another handles the log writer. A separate thread is also available for general database cleanup tasks, such as periodically shrinking a database that is in auto-shrink mode. Finally, a pool of threads handles all user commands.

To execute the trigger, we need to execute the Delete statement:

SQL Server will return the following:

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 you add 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). To force compilation of a stored procedure, a DBA can use sp_recompile:

You have just deleted 1 record(s)! (1 row(s) affected)

You can also execute the Delete statement to delete multiple records:

Even in this case, the trigger will not be fired once for each record. We will receive just one message:

You have just deleted 4 record(s)! (4 row(s) affected)

For this reason, it is important to design your trigger to handle actions against multiple records. You will see more reasons in following paragraphs.

SQL Server maintains two temporary virtual tables during the execution of a trigger. They are called Deleted and Inserted. These tables contain

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:

all the records inserted or deleted during the operation that fired the trigger. You can use this feature to perform additional verification or additional activities on affected records. You are probably wondering if there is an Updated table. No. Because an Update can be performed as a combination of the Delete and Insert statements, records that were updated will appear in both the Deleted and Inserted tables. SQL Server will not create both tables in all cases. For example, in a trigger fired during a Delete statement, only Deleted items will be accessible. A reference to an Inserted item will cause an error. The following table will summarize the presence of virtual tables in the relevant Transact-SQL statements:

Let s modify the trigger from the previous section to display which records are deleted:

Alter Trigger trMyEquipment_D On dbo.MyEquipment After Delete As Select 'You have just deleted following ' + Cast(@@rowcount as varchar) + ' record(s)!' Select * from deleted go -- For Delete

When you delete all records from the MyEquipment table, SQL Server returns the following:

--------------------------------------------------------------You have just deleted following 5 record(s)!

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