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The unit of work for a SQL Server worker is a request, or a task, which you can think of as being equivalent to a single batch sent from the client to the server Once a request is received by SQL Server, it is bound to a worker, and that worker processes the entire request before handling any other request This holds true even if the request is blocked for some reason, such as while it waits for a lock or for I/O to complete The particular worker does not handle any new requests but waits until the blocking condition is resolved and the request can be completed Keep in mind that a session ID (SPID) is not the same as a task A SPID is a connection or channel over which requests can be sent, but there is not always an active request on any particular SPID.

Part of the event is FormClosingEventArgs, which contains the arguments that accompany the event notification as well as the reason why the form is closing.

[$4B]

In SQL Server 2008, a SPID is not bound to a particular scheduler Each SPID has a preferred scheduler, which is the scheduler that most recently processed a request from the SPID The SPID is initially assigned to the scheduler with the lowest load (You can get some insight into the load on each scheduler by looking at the load_factor column in the DMV sysdm_os_schedulers) However, when subsequent requests are sent from the same SPID, if another scheduler has a load factor that is less than a certain percentage of the average of the scheduler s entire load factor, the new task is given to the scheduler with the smallest load factor There is a restriction that all tasks for one SPID must be processed by schedulers on the same NUMA node.

The exception to this restriction is when a query is being executed as a parallel query across multiple CPUs The optimizer can decide to use more CPUs that are available on the NUMA node processing the query, so other CPUs (and other schedulers) can be used..

As mentioned earlier, the UMS was designed to work with workers running on either threads or bers. Windows bers have less overhead associated with them than threads do, and multiple bers can run on a single thread. You can con gure SQL Server to run in ber mode by setting the Lightweight Pooling option to 1. Although using less overhead and a lightweight mechanism sounds like a good idea, you should evaluate the use of bers carefully. Certain components of SQL Server don t work, or don t work well, when SQL Server runs in ber mode. These components include SQLMail and SQLXML. Other components, such as heterogeneous and CLR queries, are not supported at all in ber mode because they need certain thread-speci c facilities provided by Windows. Although it is possible for SQL Server to switch to thread mode to process requests that need it, the overhead might be greater than the overhead of using threads exclusively. Fiber mode was actually intended just for special niche situations in which SQL Server reaches a limit in scalability due to spending too much time switching between thread contexts or switching between user mode and kernel mode. In most environments, the performance bene t gained by bers is quite small compared to the bene ts you can get by tuning in other areas. If you re certain you have a situation that could bene t from bers, be sure to test thoroughly before you set the option on a production server. In addition, you might even want to contact Microsoft Customer Support Services (http://support.microsoft.com/ph/2855) just to be certain.

As you can see in Figure 5-8, the page header occupies the rst 96 bytes of each data page (leaving 8,096 bytes for data, row overhead, and row offsets). Table 5-5 shows some of the information shown when we examine the page header.

Microsoft Visual C# 2008 Express Edition: Build a Program Now!

5

TABLE 5-5

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