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So are character strings atomic What do you think Here are some other examples of values whose atomicity is at least open to question and yet can certainly appear in columns of SQL tables: Integers, which might be regarded as being decomposable into their prime factors (yes, I know this isn t the kind of decomposability we usually consider in this context; I m just trying to show that the notion of decomposability is itself open to a variety of interpretations) Fixed-point numbers, which might be regarded as being decomposable into integer and fractional parts Dates and times, which might be regarded as being decomposable into year/month/day and hour/minute/second components, respectively SQL expressions think of, eg.

Think of the job of a police detective assigned to the forensics unit. No matter what time of day or night, when a crime happens they will be called to investigate. They make certain the scene is secure, they gather their evidence, interview witnesses and

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, view definitions in the catalog which certainly are decomposable by the DBMS (because otherwise there wouldn t be any point in keeping them in the catalog in the first place) Now I d like to examine what some might regard as a more startling example Consider the table T1 in Figure 8-1, which shows that supplier S2 supplies part P1, supplier S2 supplies part P2, supplier S4 supplies part P2, and so on Note: I ll be referring to table T1 repeatedly in subsequent discussions, and it might be worth your while to make a copy of it now and keep that copy close to hand..

Users generally have to go through a wizard with many steps.*

3. Codd s famous 1970 paper A Relational Model of Data for Large Shared Data Banks (CACM 13, No. 6, June 1970) also talks about atomic values, but it never actually comes out and requires such atomicity it merely says that the possibility of eliminating [values that are not atomic] appears worth investigating.

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suspects, and do their best to solve the crime. Not only will they need to interview people but they will need to set up surveillance on their suspects and monitor their activities for a period of time. On television all of this happens in less than an hour. In real life, it takes a little bit longer. And some crimes never get solved. Now think about your life as a DBA. No matter what time of the day or night someone, somewhere, is going to have an issue with a database or a database server. When that happens, you are going to get called in to investigate. You will be expected to immediately analyze all available details and provide a recommended course of action. If your job was a television show, you would be given about an hour to solve the issue. In real life, people want an answer in less than a few minutes, especially if it is the middle of the night. And rarely are your issues allowed to go unsolved. In order to provide high level of support you will need to make certain you can do three things. First, you need to know where to look, which we will assume to mean an incident has taken place. Second, you need to know what questions to ask (and who to ask), which you can think of as an interview (or an interrogation). And third, either review your monitoring or put your monitoring in place, which is the same as surveillance. That is the DBA circle of life: something will happen, you will ask some questions, and you need to monitor some things going forward.

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* Note that you can automate the installation of MSI solutions using tools such as IntelliMirror in Active Directory.

Nevertheless, I claim that table T2 is in 1NF! For consider: First, note that of course deliberately I ve shown the sets of part numbers in column P#_SET in Figure 8-2 enclosed in set braces {}, to emphasize the fact that each such set is indeed a single value: a set value, to be sure, but a set is still, at a certain level of abstraction, a single value (I didn t stress the point earlier, but in fact the notion that a set can legitimately be regarded as a single value underpinned Codd s original definition of 1NF As you will recall, that definition was expressed in terms of domains [that have values that] are themselves sets.

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