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Now that we have a solid understanding of basic relational database concepts, it s time to look at how SQL Server 7 addresses these issues. Version 7 of SQL Server has been completely redesigned by Microsoft. It offers many new features that greatly help in the
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areas of administration, security, scalability, reliability, and performance. That s a tall order! Users of previous versions of SQL Server will see a marked improvement in performance and in the ease of management of the product. This allows developers and DBAs to focus on more important tasks, such as managing applications. Let s start by looking at the various editions of SQL Server 7, and then move on to examine the architecture of the product itself.
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Different Editions of SQL Server 7
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The SQL Server 7 platform has been designed to run in many different environments. Microsoft has gone to great lengths to ensure that the same code base is used, regardless, in all versions of the product, from the desktop platform to enterprise-level servers. There are three versions of SQL Server 7, as listed in Table 4-1. In most environments, servers will be installed with the Standard Server product. Desktop users (such as sales staff) who require their data to go will likely benefit from installing the Desktop edition. On the other end of the spectrum, large installations of SQL Server will benefit from the enhanced scalability and reliability features of the Enterprise edition. Fortunately, all three are installed, administered, and managed similarly.
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Edition Desktop
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Operating Systems Supported Windows 95/98 Windows NT 4 Workstation Windows 2000 Professional
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License Parameters Can be installed for no additional charge if users have named SQL Server Client Access Licenses. Per seat or per user
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Notes Has limited replication and DTS capabilities; decreased memory requirements. Includes Microsoft English Query and OLAP Services.
Standard Server
Windows NT 4 Server Windows 2000 Server Microsoft Small Business Server (10GB database size limit)
Enterprise
Windows NT Server, Enterprise Edition Windows 2000 Advanced Server Windows 2000 Datacenter Server
Per seat or per user
Supports clustering and very large memory.
Table 4-1.
The Different Editions of SQL Server 7
SQL Server 7 Backup & Recovery
SQL Server Services
There are several different ways in which SQL Server can be run. On the Windows 95 and Windows 98 platform, SQL Server runs as an application. That is, it is launched and managed under a specific user process. If necessary, you can use SQL Server the same way in Windows NT/2000; however, it s far more likely that you ll want the program to run independent of user context. In Windows NT/2000, SQL Server 7 can be run as a set of services. These system processes remain running on the operating system regardless of whether or not a user is logged on. The specific services that are available in SQL Server 7 are listed in Table 4-2. You may not need to install, or routinely use, all of the services listed in Table 4-2. In addition to being run as a service, SQL Server can be run as an application from the command line for special situations. The sqlservr command can be followed by an m switch to start the database in single-user mode, or an f switch to start with a minimum fail-safe
Service
Executable Name
Function The main database server engine Used for executing scheduled jobs.
Notes Can be started either as a service or from the command line. Account must have access to other machines to perform remote jobs.
SQL Server Service Sqlservr.exe (MSSQL) SQL Server Agent Sqlagent.exe
MS Distributed Transaction Coordinator (MSDTC)
Msdtc.exe
Full-Text Search
Mssearch.exe
Microsoft English Query Microsoft OLAP Services
Mseq.exe
Msolap.exe
Allows for processing and monitoring real-time transactions involving remote servers. Allows users to perform searches of TEXT column types. Allows end users to perform SQL queries in plain English. Allows for complex data analysis using data cubes.
Installed separately after SQL Server is installed. Installed separately after SQL Server is installed.
Table 4-2.
SQL Server 7 Services
4:
SQL Server 7 Architecture
configuration. Both options can be helpful in database maintenance and/or troubleshooting. Keep in mind that you cannot start, stop, or pause SQL Server by using the Services Control Panel applet if you started it from the command line, because this process is not running as a service.
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