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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.
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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.
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TIP: In many cases, you should allow users to stay connected even if they will be idle for periods of, say, an hour rather than have them continually connect and disconnect. Repeatedly incurring the overhead of the logon process is more expensive (in terms of overhead) than simply allowing the connection to remain live but idle.
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In the previous context, a user is considered idle from the database perspective. The human end user might be quite active, filling in the data entry screen, getting information from customers, and so forth. But those activities do not require any server interaction until a command is actually sent. So from the SQL Server engine perspective, the connection is idle. When you think of an active user versus an idle user, be sure to consider the user in the context of the back-end database server. In practically all types of applications that have many end users, at any given time the number of users who have an active request with the database is relatively small. A system with 1,000 active connections might reasonably be configured with 150 or so worker threads. But this does not mean that all 150 worker threads are created at the start they are created only as needed, and 150 is only a high-water mark. In fact, fewer than 100 worker threads might be active at a time, even if end users all think they are actively using the system all the time. A thread from the worker thread pool services each command to allow multiple processors to be fully utilized as long as multiple user commands are outstanding. In addition, with SQL Server 2000, a single user command with no other activity on the system can benefit from multiple processors if the query is complex. SQL Server can break complex queries into component parts that can be executed in parallel on multiple CPUs. Note that this intraquery parallelism occurs only if there are processors to spare that is, if the number of processors is greater than the number of connections. In addition, intraquery parallelism is not considered if the query is not resource-expensive to run, and the threshold for what constitutes
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