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1 Let s start with the Color table In Database Explorer, right-click the table s folder icon, and select Add New Table You should now see an empty grid on the designer surface, which is the Table Designer You will also see that a new toolbar has appeared, which is the Table Designer toolbar This toolbar has all the tools necessary to help you create a table without writing a single SQL query 2 You ll now add a column to the Color table Type ColorID in the Column Name field of the Table Designer Select int as the data type, and clear the Allow Nulls check box because this column will be the primary key in this table A primary key cannot be null since it is part of the uniqueness of a row in the table 3.

Fragmentation causes your disk subsystem to perform more seeks, which slows the transfer rate and results in sluggish disk performance. Defragmenting is occasionally necessary because of the way files are stored on disk. Fragmentation can occur when:

If you are using Web-based mail such as Hotmail, where you log on to a mail server on the Internet, ICF will not interfere with your e-mail retrieval. If you are using an e-mail client, such as Microsoft Outlook Express, which polls its mail server to see if there is new mail (and the mail is downloaded if there is), ICF will also not interfere with this kind of communication. However, if your e-mail client waits for an RPC from a mail server that tells the e-mail client that there is mail to download, ICF will block the RPC traffic because it will appear as unsolicited traffic. Outlook, when connecting to a Microsoft Exchange server (such as in the case of a domain-based mail system), is an example of an e-mail application that uses RPCs. If you are using Outlook in stand-alone mode, you ll not have an RPC problem. If you are using Outlook and RPCs are used, you ll need to configure Outlook to poll the Exchange server for new mail instead of having the Exchange server send RPCs to you. The odds are good, however, that if you are in an environment where Exchange server is used, you ll not be using ICF anyway because the domain will probably use a proxy server or firewall server. Keep in mind that ICF is designed for the home and small office, so Outlook and the Exchange server issue usually isn t a problem.

You create a file, but the volume does not have a group of contiguous, free clusters that is large enough to contain the entire file. Therefore, the file is broken into fragments rather than residing in contiguous clusters on the disk. You edit a file so that it outgrows its existing space on the disk. When a file uses all the clusters in a group of contiguous, free clusters, the file is then broken into fragments that are stored in free clusters elsewhere on the disk.

Although FAT and NTFS are designed to make storage faster and more efficient when you save files, these file systems take longer to read and write fragmented files than unfragmented files. When the files on a disk become badly fragmented, performance noticeably suffers because the disk heads must move to different tracks on the disk to locate all the clusters of the file. Defragmentation tools fix this problem by moving the files into contiguous clusters on the disk. Reducing fragmentation reduces the amount of mechanical movement required to locate all clusters of a file, which improves hard disk performance.

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One issue that worries many ICF users is the lack of an interface that tells you what is happening at the firewall. Unless the log file tells you about dropped packets, how do you know if ICF is really protecting you ICF is designed to do its job in Windows XP behind the scenes, but you might wonder if it is really working. You can rest assured that ICF is working if it is enabled, but if you are the curious type, you can test ICF using the ping command. To test ICF, follow these steps:

Windows XP Professional provides two methods for defragmenting FAT and NTFS volumes:

The Disk Defragmenter snap-in (Dfrg.msc). The new Disk Defragmenter command-line tool (Defrag.exe).

Both tools rearrange files, folders, programs, and unused space on your computer s hard disk to optimize disk performance. In addition, the defragmentation tools are improved in Windows XP Professional so that you can:

1 On the ICF connection, open the Advanced Settings dialog box. 2 On the Security Logging tab, ensure that logging is enabled for