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Although SQL Server might seem to offer each user a separate operating system thread, the system is actually a bit more sophisticated than that. Because it is inefficient to use hundreds of separate operating system threads to support hundreds of users, SQL Server establishes a pool of worker threads. When a client issues a command, the SQL Server network handler places the command in a queue, and the next available thread from the worker thread pool takes the request. Technically, this queue is a Windows NT/2000 facility called an IOCompletion port. The SQL Server worker thread waits in the completion queue for incoming network requests to be posted to the IOCompletion port. If no idle worker thread is available to wait for the next incoming request, SQL Server dynamically creates a new thread until the maximum configured worker thread limit has been reached. The client s command must wait for a worker thread to be freed. Even in a system with thousands of connected users, most are typically idle at any given time. As the workload decreases, SQL Server gradually eliminates idle threads to improve resource and memory use. The worker thread pool design is efficient for handling thousands of active connections without the need for a transaction monitor. Most competing products, including those on the largest mainframe systems, need to use a transaction monitor to achieve the level of active users that SQL Server can handle without such an extra component. If you support a large number of connections, this is an important capability.

9:

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.

(1 row(s) affected) Id 1 2 3 4 5 Description Toshiba Portege 7020CT Sony Trinitron 17XE NEC V90 HP LaserJet 4 HP LaserJet 4

----------- --------------------------------------------------

(5 row(s) affected)

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You can use values from these tables, but you cannot modify them directly. If you need to perform some operation on records that were inserted, for example, you should not try to change them in the Inserted table. The proper method would be to issue a regular Transact-SQL statement against the original table. In the Where or From clause, you can reference the virtual table (Inserted) and in that way limit the subset of the original table that you are targeting. In the following example, the trigger calculates a SOUNDEX code for the Make and Model of the Equipment records affected by the Insert or Update statement that has fired the trigger:

Alter Trigger trEquipment_IU On dbo.Equipment After Insert, Update As -- precalculate ModelSDX and MakeSDX field -- to speed up use of SOUNDEX function update Equipment Set ModelSDX = SOUNDEX(Model), MakeSDX = SOUNDEX(Make) where EquipmentId IN (Select EquipmentId from Inserted) -- For Insert, Update

Do not forget to recompile dependent objects after you add an index to a table. Otherwise, SQL Server will not be able to use them.

A trigger is executed once for each modification statement (Insert, Update, or Delete). An after trigger is fired after the modification statement finishes successfully. If a statement fails for another

reason (for example: foreign key or check constraints), the trigger is not invoked. For example, the Equipment table has the following Delete trigger:

Alter Trigger Equipment_DeleteTrigger On dbo.Equipment After Delete As Print 'One or more rows are deleted in Equipment table!' -- For Delete

Attempt to delete all records from the table:

SQL Server aborts the execution because there is a foreign key relationship with the Inventory table. The execution is aborted before the trigger is invoked:

Server: Msg 547, Level 16, State 1, Line 1 DELETE statement conflicted with COLUMN REFERENCE constraint 'FK_Inventory_Equipment'. The conflict occurred in database 'Asset', table 'Inventory', column 'EquipmentId'. The statement has been terminated.

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