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In addition, the draft standards attempted to officially standardize parts of the SQL language where different "proprietary standards" had long since been set by the various major DBMS brands As a result, the proposed SQL2 and SQL3 standards were a good deal more controversial than the initial SQL standard The SQL2 standard weaved its way through the ANSI approval process and was finally approved in October, 1992 While the original 1986 standard took less than 100 pages, the SQL2 standard (officially called "SQL-92") takes nearly 600 pages The SQL2 standards committee acknowledged the large step from SQL1 to SQL2 by explicitly creating three levels of SQL2 standards compliance The lowest compliance level ("Entry-Level") requires only minimal additional capability beyond the SQL-89 standard The middle compliance level ("Intermediate-Level") was created as an achievable major step beyond SQL-89, but one that avoids the most complex and most system-dependent and DBMS brand-dependent issues.

date 1/8/2009 1/8/2009

Using this feature, systems administrators can choose to perform RAID reconfigurations and add new disks to the system without requiring a restart of the OS. Of course, the hardware must support hot-plugging drives. The same RAID levels supported in Windows NT 4 (described earlier in this chapter) are supported in Windows 2000. However, the configuration of volume sets, stripe sets, and stripe sets with parity is only supported for dynamic disks. Windows 2000 also supports the use of the FAT, FAT32, and NTFS file systems (called basic disks), but changes to disk configurations may require a reboot of the server. Basic disks can be converted to dynamic disks, but they cannot be converted back (without manually backing up the files, making configuration changes, and then restoring them). You can also specify mount points within an NTFS partition so that users and administrators can easily access information that is stored deep within a folder hierarchy. This feature is very helpful, especially when large disks or disk arrays are being used. For more information, see the online help included with Windows 2000.

The third compliance level ("Full") requires a full implementation of all SQL2 capabilities Throughout the 600 pages of the standard, each description of each feature includes a definition of the specific aspects of that feature which must be supported in order to achieve Entry, Intermediate, or Full compliance Despite the existence of a SQL2 standard, no commercial SQL product available today implements all of its features, and no two commercial SQL products support exactly the same SQL dialect Moreover, as database vendors introduce new capabilities, they are expanding their SQL dialects and moving them even further apart The central core of the SQL language has become fairly standardized, however Where it could be done without hurting existing customers or features, vendors have brought their products into conformance with the SQL-89 standard, and the same will slowly happen with SQL2 In the meantime, work continues on standards beyond SQL2.

sku A-1011 Z-3320

many businesses that rely on leased lines. Finally, authentication mechanisms are extensible so that newer technologies can be integrated. One example is in the area of biometrics the use of fingerprint, retina, or other scans to identify users. As these methods become more affordable, they will move from the pages of science fiction novels into corporate networks. Figure 3-23 shows the user interface of the Routing and Remote Access Service. One of the fundamental requirements for most business networks nowadays is Internet access for all LAN users. New networking features include the ability to perform Internet Connection Sharing (ICS) and Network Address Translation (NAT). Both technologies enable you to provide access to remote networks (such as the Internet) for an entire LAN by using a single Windows 2000 Server machine. From a security standpoint, these technologies can reduce the chances of network intrusion; you can use them to hide the internal TCP/IP addresses of computers on the network while still allowing them to request information from outside the LAN.

benson 1,222.00 0

The "SQL3" effort effectively fragmented into separate standardization efforts and focused on different extensions to SQL Some of these, such as stored procedure capabilities, are already found in many commercial SQL products and pose the same standardization challenges faced by SQL2 Others, such as proposed object extensions to SQL, are not yet widely available or fully implemented, but have generated a great deal of controversy With most vendors far from fully implementing SQL2 capabilities, and with the diversity of SQL extensions now available in commercial products, work on SQL3 has taken on less commercial importance The "real" SQL standard, of course, is the SQL implemented in products that are broadly accepted by the marketplace For the most part, programmers and users tend to stick with those parts of the language that are fairly similar across a broad range of products.

Figure 3-23.

chiu 3,011.11 600.00

3:

The innovation of the database vendors continues to drive the invention of new SQL capabilities; some products remain years later only for backward compatibility, and some find commercial success and move into the mainstream..

date 1/8/2009 1/8/2009 1/8/2009 1/8/2009 1/8/2009 1/8/2009

Data Protection in Windows NT/2000

sku A-1011 Z-3320 A-1011 A-1011 Z-3320 Z-3320