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Table 4-4 lists common information schema views and the typical purpose of each. It is important to note that the information schema views are security-dependent. That is, users will only be able to see information about objects to which they have been granted the appropriate permissions. Again, a complete list of all the views is available in SQL Server Books Online.
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SQL Server 7 Architecture
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Information Schema View columns referential_constraints schemata table_privileges tables views
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Information Returned A list of all columns in all accessible tables and views Information about primary key and foreign key relationships Information about all the databases on the current server Security permissions on the tables within a database A list of all tables and views in the database Information about the specified view
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Table 4-4.
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Commonly Used Information Schema Views
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SQL Server 7 Backup & Recovery
Data Locking
To ensure that resources are available to multiple users at a time, individual sessions must lock data before they attempt to modify it. While certain information is locked, no other users can modify the same information. A major performance enhancement in SQL Server 7 is the ability to perform row-level locking. This allows users to lock only a specific row within a table instead of the table itself while making changes. Row-level locking, therefore, allows multiple users to modify the same table at the same time. SQL Server also supports row locks (partial or complete), indexes, tables, and databases. Covering all of the issues related to locking can be quite complex and is beyond the scope of this book.
Network Communications
The real purpose of your database is to communicate with clients, whether they are end users who query your application directly, client/server applications, or other database servers. In order for clients and the database server to communicate, a common method of data transfer must be determined. The default selections for Network Libraries (shown in Figure 4-7) will be appropriate for most TCP/IP-based environments. SQL Server can use any number of Network Libraries to communicate, but each must be enabled separately on both the client and the server. Table 4-5 lists the available protocol types and the typical users of each. If you re having trouble connecting to a SQL Server installation, the protocols likely are misconfigured. It has become increasingly common to connect to database servers over the Internet. Although this is supported using the TCP/IP protocol, you must also make sure that there are no firewalls that block the appropriate communications ports. These options
Figure 4-7.
SQL Server network architecture
4:
SQL Server 7 Architecture
Protocol AppleTalk Banyan VINES Multiprotocol
Suggested Type of Client Macintosh clients VINES clients All
Notes Uses local AppleTalk zone for communications. Supports SPP communications; only available on Intel platform. Uses any protocol type; data and authentication encryption are possible. Works on TCP/IP, NetBEUI, or IPX/SPX networks. Can connect to NetWare Bindery. Uses TCP port 1433 by default and can work over the Internet; also supports MS Proxy Server.
Named pipes NWLink IPX/SPX TCP/IP
Windows 95/98/NT only Novell NetWare clients and servers All TCP/IP clients
Table 4-5.
SQL Server Network Libraries
can be modified after SQL Server installation by using the Client Network Utility and Server Network Utility programs in the Microsoft SQL Server 7 program group.
WORKING WITH SQL SERVER 7
So far, we have been talking about SQL Server architecture. This topic is somewhat theoretical, but is necessary in understanding how SQL Server works. Now, it s time to look at what you the database administrator or implementer work with daily. One of the most welcome enhancements to SQL Server 7 is easier administration. Database servers used to be the domain of specialized administrators who understood the architecture of the product and used archaic commands to interact with the machine. Realizing that not all systems administrators are also DBAs, Microsoft has greatly simplified the processes involved with designing, implementing, and managing a database solution. We have already talked about such features as dynamic file management, but that s just scratching the surface. SQL Server 7 includes many enhancements that improve manageability and decrease time spent in administration. Those who have worked with other RDBMSs will find the tools in SQL Server 7 to be intuitive and easier to use. Let s start with the heart of the administrative interface.
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