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System Architecture of SQL Server
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hroughout this book, we will look at specific features of the Microsoft SQL Server engine. In this chapter, we will examine what makes up that engine and how it works. If you are interested only in the functional operations of SQL Server and want to consider everything as a black box operation, you can safely skip this chapter. Here we will focus on what happens inside the engine. We will also point out system behavior that might affect application development and suggest ways to deal with it. Additionally, the understanding of SQL Server database structure that you will gain herein will help you develop and implement your databases effectively, should you participate in the development process. In addition to architecture explanations, this chapter discusses the types of databases found in SQL Server and also describes two types of structural elements: database objects and system tables.
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Figure 2-1 shows the general architecture of SQL Server. For simplicity, we have made some minor omissions and simplifications and ignored certain helper modules. Now let s look in detail at the major modules.
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The Net-Library (often called Net-Lib; in this book we will use the two terms interchangeably) abstraction layer enables SQL Server to read from and write to many different network protocols, and each such protocol (such as TCP/IP sockets) can have a specific driver. The Net-Library layer makes it relatively easy to support many different network protocols without having to change the core server code. A Net-Library is basically a driver that is specific to a particular network inter-process communication (IPC) mechanism. (Be careful not to confuse driver with device driver.) All code in SQL Server, including Net-Library code, makes calls only to the Microsoft Win32 subsystem. SQL Server uses a common internal interface between
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Figure 2-1.
SQL Server architecture
Microsoft Open Data Services (ODS), which manages its use of the network, and each Net-Library. If your development project needs to support a new and different network protocol, all network-specific issues can be handled by simply writing a new Net-Library. In addition, you can load multiple Net-Libraries simultaneously, one for each network IPC mechanism in use. SQL Server uses the Net-Library abstraction layer on both the server and client machines, making it possible to support several clients simultaneously on different networks. Microsoft Windows
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NT/2000, Windows 95, and Windows 98 each allow multiple protocol stacks to be used simultaneously on one system. Net-Libraries are paired. For example, if a client application is using a Named Pipes Net-Library, SQL Server must also be listening on a Named Pipes Net-Library. (You can easily configure multiple Net-Libraries using the SQL Server Network Utility, which is available under the Programs\Microsoft SQL Server 2000.0 folder from your Start button.) It is important to distinguish between the IPC mechanisms and the underlying network protocols. IPC mechanisms used by SQL Server include Named Pipes, RPC, SPX, and Windows Sockets. Network protocols used include TCP/IP, NetBEUI, NWLink (IPX/SPX), Banyan VINES SPP, and Appletalk ADSP. Two Net-Libraries, Multiprotocol and Named Pipes, can be used simultaneously over multiple network protocols (NetBEUI, NWLink IPX/SPX, and TCP/IP). You can have multiple network protocols in your environment and still use only one Net-Library. On machines running Windows 95 or Windows 98, you can also use shared memory as an IPC mechanism. This is considered both the IPC and the network protocol and is available only for local connections in which the client is running on the same machine as SQL Server. In addition, SQL Server running on Windows 95 or Windows 98 machines does not support Named Pipes as an IPC. The Multiprotocol Net-Library uses the RPC services of Windows 2000, Windows NT/2000, Windows 95, or Windows 98. It could just as well have been called the RPC Net-Library, but Multiprotocol better conveys its key benefit. Because the Multiprotocol Net-Library uses the RPC services of the operating system, it can encrypt all traffic (including requests, data, and passwords) between the client application and the SQL Server engine. Both Named Pipes and RPC services in Windows 2000 support impersonation of security contexts to provide an integrated logon capability (also known as Windows NT/2000 Authentication). That is, instead of requiring a separate user ID/password logon each time a connection to SQL Server is requested, SQL Server can impersonate the security context of the user running the application that requests the connection. If that user has sufficient privileges (or is part of a Windows NT/2000 domain group that does), the connection is
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