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Database - This is a data structure used to store organized information. A database is typically made up of many linked tables of rows and columns. For example, a company might use a database to store information about their products, their employees, and financial information. Databases are now also used in nearly all e-commerce sites to store product inventory and customer information. Database software, such as Microsoft Access, FileMaker Pro, and MySQL is designed to help companies and individuals organize large amounts of information in a way where the data can be easily searched, sorted, and updated.

Defragment - Defragmenting your hard drive is a great way to boost the performance of your computer. Though the term "defragment" sounds a little abrasive, it is actually a simple and helpful process. After all, a defragmented hard drive is a happy hard drive. Adding and deleting files from your hard drive is a common task. Unfortunately, this process is not always done very efficiently. For example, when you delete a bunch of little files and add a new large file, the file may get broken up into mulitple sections on the hard drive. The computer will still read the newly added file as a single valid file, but it will have to scan multiple parts of the drive to read it. Because hard disk seek time is one of the biggest bottlenecks in a computer's performance, this can drag down your computer's speed quite a bit. If you have a ton of "fragmented" files on your hard disk, you might hear extra grinding, sputtering, and other weird noises coming from your computer. You computer doesn't like having fragmented files any more than you do. This is why defragmenting your hard drive is such a good idea. When you start to hear extra grinding sounds, or your computer doesn't open files as quickly as it did before, it's time to defragment. With Windows, you can use the pre-installed Intel defragment program to defragment your hard drive. You can also use a commercial software program like Norton Utilities to defragment your hard drive more efficiently and with more options. For Mac users, Norton Utilities or another hard drive utility is the only way to do it. If you use your computer daily, defragmenting your hard drive once a month should keep the fragment-fiends away.

Demilitarized Zone - A DMZ is the physical zone behind an Internet facing firewall and in front of a second level firewall that protects back-end systems and data. In a typical Internet application scenario, the DMZ is the physical virtual local area network (VLAN) on which the Web servers are deployed.

DMZ - See Demilitarized Zone

DNS - See Domain Name System

Domain Name System - The set of conventions for naming host computers on the Internet and the directory service for looking up names. Each host name corresponds to an IP address.

Dynamic Data Routing - Dynamic data routing is logic that is used to determine which database server to send a date retrieval or modification request to when the data is partitioned across multiple servers. DDR can be implemented using a hashing algorithm, a rule table, or some other partitioning scheme.


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