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To understand how SQL Server works, it is useful to compare its strategies to those generally used by other products. On a nonthreaded operating system such as some UNIX variants, a typical SMP database server has multiple DBMS processes, each bound to a specific CPU. Some implementations even have one process per user, which results in a high memory cost. These processes communicate using shared memory, which maintains the cache, locks, task queues, and user context information. The DBMS must include complex logic that takes on the role of an operating system: It schedules user tasks, simulates threads, coordinates multiple processes, and so on. Because processes are bound to specific CPUs, dynamic load balancing can be difficult or impossible. For the sake of portability, products often take this approach even when they run on an operating system that offers native threading services, such as Windows NT/2000. SQL Server, on the other hand, uses a clean design of a single process and multiple operating system threads. The threads are scheduled onto a CPU by a User Mode Scheduler. SQL Server always uses multiple threads, even on a singleprocessor system. Threads are created and destroyed depending on system activity, so thread count is not constant. Typically, the number of active threads in SQL Server ranges from 16 to 100,

Triggers are a unique type of procedure. Triggers are very similar to events a type of procedure in certain programming languages such as Visual Basic. Events in Visual Basic are initiated by the system when certain actions occur (for instance, a form is loaded, a text box receives focus, or a key is pressed).

9:

Figure 9-9.

Triggers are associated with a table in a database and executed by SQL Server when a specific change occurs in the table. The change could be the result of the following modification statements:

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Execution plans remain in the procedure cache for a while. If the same or some other user issues a similar batch, the relational engine first attempts to find a matching execution plan in the procedure cache. If it exists, it will be reused. If it does not exist, Microsoft SQL Server parses and compiles a batch. If SQL Server requires more memory than is available, it might remove some execution plans from memory. There is a sophisticated aging algorithm that takes into account how long ago and how many times an execution plan is used. If there is an abundance of memory, it is possible that execution plans will remain in the cache indefinitely.

SQL Server 7.0 and earlier versions recognized only one type of trigger. In SQL Server 2000, this type is called an after trigger. SQL Server 2000 introduces a new type an instead-of trigger. In the following sections, we first examine the standard (after) triggers and then we introduce the new instead-of type.

Let s look at the simplified syntax for implementing the core functionality of triggers:

Create Trigger trigger_name On table {For { [Delete] [,] [Insert] [,] [Update] } As sql_statement [...n]

A header, which is a Transact-SQL statement for creating a trigger. It consists of three components:

The name of the trigger The name of the table with which the trigger will be associated A modification statement (that is, an event) that will initiate the trigger

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