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Although it is the most widely recognized, the ANSI/ISO standard is not the only standard for SQL. X/OPEN, a European vendor group, has also adopted SQL as part of its suite of standards for a "portable application environment" based on Unix. The X/OPEN

A major challenge for organizations of any size is keeping people connected with their home networks. Traditional remote access solutions (generally using modems and leased lines) leave a lot to be desired. First, they are expensive to purchase and implement. For example, if I wanted to set up a remote dial-in solution, I d have to purchase and install proprietary hardware. If scalability were a requirement, I would need to purchase and add additional ports to the configuration. Worse yet, when new modem technologies came around, I d have to upgrade the ports. Finally, if I wanted to support newer remote access technologies, such as cable modems and an Asynchronous Digital Subscriber Loop (ADSL), a completely different solution would be necessary. All of these communications also work over costly leased lines that incur charges for data transport and connection times. Long-distance telephone charges alone can account for a significant portion of an IT department s budget. One of the most significant advances in the area of remote access is the virtual private network (VPN). VPNs allow companies to use the infrastructure of a public network (such as the Internet) to transfer information securely. A VPN provides this security by managing authentication and by encrypting all information traveling between the client and the server. Figure 3-24 diagrams the setup of a basic VPN. The steps are logically very simple. First, clients connect to the Internet using any of a variety of mechanisms. Then, they connect to a remote VPN server using protocols that provide for authentication and data encryption. Once they are authenticated, users can use this tunnel to transfer data between clients and servers.

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Figure 3-24.

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

So far, we have discussed several ways to protect information on the Windows NT 4 and Windows 2000 operating systems. Many of these techniques ensure that your data is protected, but how exactly do you recover from a situation in which data loss or corruption has occurred In this section, we ll look at the various ways in which you can recover data at the OS level. In some cases, the solutions will be quite obvious. For example, if you need to recover a file that was previously backed up to tape, you can simply use your backup application to perform the necessary operations. But what if your OS won t boot, due to a corruption in system files or misconfiguration In this case, the best answer might be to fix the corrupt files instead of recovering all the data on the server manually. Let s look at ways in which you can recover from various scenarios.

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standards play a major role in the European computer market, where portability among computer systems from different vendors is a key concern. Unfortunately, the X/OPEN standard differs from the ANSI/ISO standard in several areas. IBM also included SQL in the specification of its bold Systems Application Architecture (SAA) blueprint, promising that all of its SQL products would eventually move to this SAA SQL dialect. Although SAA failed to achieve its promise of unifying the IBM product line, the momentum toward a unified IBM SQL continued. With its mainframe DB2 database as the flagship, IBM introduced DB2 implementations for OS/2, its personal computer operating system, and for its RS/6000 line of Unix-based workstations and servers. By 1997, IBM had moved DB2 beyond its own product line and shipped versions of DB2Universal Database for systems made by rival manufacturers Sun Microsystems, Hewlett-Packard, and Silicon Graphics, and for Windows NT. With IBM's historical leadership in relational database technology, the SQL dialect supported by DB2 version is a very powerful de facto standard.

NOTE: The information in this section focuses on an overview of the methods for recovering from data loss scenarios. If you need further information on performing these tasks, please see the online help that is provided with Microsoft Windows NT and Windows 2000. It is important to take the time to ensure that you understand the actual processes completely, before a data loss situation occurs.

sku A-0033 A-0033 A-0033 B-3691 B-3691 B-3691