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its own batch or to make the network packet size smaller. The first solution is probably the best one in this case, since it is typically difficult to fine-tune your application to determine the best buffer size for each command. But this does not mean that each command should be its own batch. Quite the contrary. In fact, under normal circumstances, grouping multiple commands into a single batch is most efficient and recommended because it reduces the amount of hand-shaking that must occur between client and server.
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By default, SQL Server on Windows NT/2000 always listens on Named Pipes as well as on TCP/IP and Multiprotocol. SQL Server running on either Windows 95 or Windows 98 listens on the shared memory library instead of on Named Pipes, but it also has TCP/IP and Multiprotocol available. You can add other Net-Library interfaces. On Windows NT/2000, you can also remove any of the Net-Libraries, but it is best not to remove Named Pipes. All the other Net-Libraries on Windows NT/2000 require an actual network. Because Named Pipe services exist in Windows NT/2000 even when no network is present, using Named Pipes leaves you a back door into SQL Server even if your network becomes totally nonfunctional. Similarly, SQL Server on either Windows 95 or Windows 98 always listens over the shared memory IPC by default, so you should avoid removing this option. Even with no network (which is a more likely scenario in Windows 95 and Windows 98 than in Windows NT/2000), shared memory is still available for inter-process communication. Figure 2-2 shows the path from the SQL Server client application to the SQL Server engine and indicates where the Net-Library interface fits in. On the server side, ODS provides functionality that mirrors that of ODBC, OLE DB, or DB-Library at the client. Calls exist for an ODS server application to describe and send result sets, to convert values between datatypes, to assume the security context associated with the specific connection being managed, and to raise errors and messages to the client application. ODS uses an event-driven programming model. Requests from servers and clients trigger events to which your server application
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must respond. Using the ODS application programming interface (API), you create a custom routine, called an event handler, for each possible type of event. Essentially, the ODS library drives a server
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application by calling its custom event handlers in response to incoming requests. ODS server applications respond to the following events:
Connect Events When a connect event occurs, SQL Server initiates a security check to determine whether a connection is allowed. Other ODS applications, such as a gateway to DB/2, have their own logon handlers that determine whether connections are allowed. Events also exist that close a connection, allowing the proper connection cleanup to occur. Language Events When a client sends a command string, such as a SQL statement, SQL Server passes this command along to the command parser. A different ODS application, such as a gateway, would install its own handler that accepts and is responsible for execution of the command. Remote Stored Procedure Events These events occur each time a client or SQL Server directs a remote stored procedure request to ODS for processing.
ODS also generates events based on certain client activities and application activities. These events allow an ODS server application to respond to changes to the status of the client connection or of the ODS server application. In addition to handling connections, ODS manages threads (and fibers) for SQL Server. It takes care of thread creation and termination and makes the threads available to the User Mode Scheduler (UMS). Since ODS is an open interface with a full programming API and toolkit, other independent service vendors (ISVs) writing server applications with ODS get the same benefits that SQL Server derives from this component, including symmetric multiprocessing (SMP)-capable thread management and pooling as well as network handling for multiple simultaneous networks. This multithreaded operation enables ODS server applications to maintain a high level of performance and availability and to transparently use multiple processors under Windows NT/2000, because the operating system can schedule any thread on any available processor.
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