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Internet Conversations You can carry on a teletype-style (real-time text) conversation with other computer users using the Internet When done among users within a single service provider, this is called chat When done among people connected to different service providers, it is called Internet relay chat (IRC) Typing messages to, and reading them from, other people in real time is more personal than letter writing, because your addresses get their messages immediately But it s less personal than talking on the telephone, because you cannot hear, or make, vocal inflections It is possible to digitize voice signals and transfer them via the Internet This has given rise to hardware and software schemes that claim to provide virtually toll-free long-distance telephone communications As of this writing, this is similar to cellular telephone communications in terms of reliability and quality of connection When Net traffic is light, such connections can be good But when Net traffic is heavy, the quality is marginal Audio signals, like any other form of Internet data, are broken into packets All, or nearly all, the packets must be received and reassembled before a good signal can be heard This takes variable time, depending on the route each packet takes through the Net If many of the packets arrive disproportionately late, the destination computer can only do its best to reassemble the signal In the worst case, the signal does not get through at all Getting Information One of the most important features of the Internet is the fact that it can connect you with millions upon millions of sources of information (and misinformation) Data is transferred among computers by means of a protocol that allows the files on the hard drives of distant computers to become available exactly as if the data were stored on your own computer s hard drive, except the access time is slower You can also store files on distant computers hard drives When using the Internet for obtaining information, you should be aware of the time at the remote location, and avoid, if possible, accessing files during the peak hours at the remote computer Peak hours usually correspond to working hours, or approximately 8:00 am to 5:00 pm local time, Monday through Friday You must take time differences into account if you re not in the same time zone as the remote computer The World Wide Web (also called WWW or the Web) is one of the most powerful information servers you will find on the Internet, and in common usage, the terms Internet and Web have become almost synonymous The outstanding feature of the Web is hypertext, a user-friendly scheme for cross-referencing of documents In fact, the names of Web sites generally begin with the four letters http, which stands for hypertext transfer protocol Certain words, phrases, and images make up links When you select a link in a Web page or Web site (a document containing text, graphics, and often other types of files), your computer is transferred to another site dealing with the same or a related subject This site will usually also contain numerous links Before long, you might find yourself surfing the Web for hours, going from site to site The word surfing derives from the similarity of this activity to television channel surfing.

If the page is cached, the data can be returned immediately. Otherwise, a physical read has to be issued to retrieve the page from disk. The duration of such a physical read depends on your storage subsystem. A physical read is typically several orders of magnitude slower than a read satisfied by the cache. Physical reads come in two flavors: sequential reads and random reads. Although it depends on your storage subsystem and other factors like fragmentation, sequential reads are assumed to be significantly faster than random reads. Because of this, behind the scenes, the optimizer s primary objective is to minimize the number of physical reads and writes, and to favor sequential reads over random reads. This chapter has the same goal: to help you minimize the number of physical reads. If you want to optimize your queries for a hot cache, then this chapter won t help you because the storage engine s performance characteristics are different for cached data.

Assign a variable name to the from parameter to store the coordinates of the window s starting position Again, you can use any name of your choice; this example uses starting_position:

The term correlation is used loosely here. We re trying to determine the chance that two consecutive nonclustered index keys refer to the same data page. And we re only considering tables that have a clustered index, although the same theory would also hold for heaps.