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You can take a few precautions, however. You could filter out spaces and punctuation characters when you extract the fragments. For instance, in the email example, we could change the wordfragments function so that it does not return fragments with the period (.) and at (@) characters. You could achieve a more drastic space reduction by setting an upper limit to how many matches you save for a fragment. When you have reached this limit, you don t save any more mappings. You could even take the brutal step to throw those matches away, and if a user enters a search string with only such fragments, you tell him that he must refine his search criteria. In contrast, the space overhead of the bitmask solution is independent of the size of the column you track. Thus, it could serve better for longer columns. I see a potential problem, though: as strings get longer, more and more characters appear in the string and most bitmask values will be in the high end. Then again, Sylvain originally developed this for a varchar(255) column, and was satisfied with the outcome. In any case, if you opt to implement any of these techniques in your application, you will probably be able think of more tricks and tweaks. What you have seen here is only the beginning.

Most of these properties are pretty straightforward, but these three things aren t immediately obvious:

Erland Sommarskog is an independent consultant based in Stockholm, Sweden. He started to work with relational databases in 1987. He first came in contact with SQL Server in 1991, even if it said Sybase on the boxes in those days. When he changed jobs in 1996 he moved over to the Microsoft side of things and has stayed there. He was first awarded MVP in 2001. You can frequently see him answer SQL Server questions on the newsgroups. He also has a web site, www.sommarskog.se, where he has published a couple of longer articles and some SQL Server related utilities.

(c) inverse parallel (d) push-push (e) push-pull 25 The circuit in Fig Test4-2 would be a bad choice for use as a medium-power audio amplifier because (a) bipolar transistors do not work well in audio applications (b) transformers should not be used in audio amplifiers (c) this type of circuit invariably produces a lot of distortion (d) this type of circuit cannot produce appreciable output power (e) Hold it! The circuit in Fig Test4-2 would be a good choice for use as a medium-power audio amplifier 26 In an electrostatic CRT, the electron beam can be diverted up and down by (a) synchronization pulses applied to the deflecting coils (b) ELF radiation from the accelerating anodes (c) charged plates that attract or repel moving electrons (d) modulation of the signal on the control grid (e) variable input to the electron gun

Ratings In the user interface, you rate a track by assigning it a number of stars, from one star (irredeemably wretched) to five stars (the best thing since vacuum-packed coffee) Until you assign a rating, the track has no stars Internally, iTunes uses an integer from 0 to 100 to represent the stars: 0 is no stars, 20 is one star, 40 is two stars, 60 is three stars, 80 is four stars, and 100 is five stars

It seems that I spend quite a bit of my time answering questions from family, friends and neighbors who want to know how to resurrect their computers, or from developers who need to figure out how to get around some seemingly impossibly complex problem. Thankfully, not all of their problems are that complex. I expect that many of you are confronted by many of the same queries from those that look up to you as a technical resource like the doctor who lives up the street who listens patiently while you describe that pain in your right knee. A couple of the most common questions I get on the public Network News Transfer Protocol (NNTP) newsgroups (such as Microsoft.public.dotnetframework.adonet and ..sqlserver.connect1), are How do I get connected and Should I stay connected This chapter attempts to explain how the SQL Server connection mechanism works and how to create an application that not only can connect to SQL Server in its various manifestations but stays connected when it needs to. I don t have room here to provide all of the nuances, but I hope I can give you enough information to solve some of the most common connection problems and, more importantly, help you design your applications with best-practice connection management built in.