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If you have a help desk in place already, it may be easier for you to track your requests and make certain you are meeting your defined SLAs. If you do not have anything in place, then you should look to start grouping and classifying your requests as well as a standard resolution time. Start tracking what it is you do. Write down that you did a password reset, or that you did a restore by refreshing development from production, or that you spent time reviewing a server for any missing indexes. Get a sense for a lot of the common tasks that are coming your way and also note just how long it takes for you to resolve each of them. TIP: Document everything that you can, no matter how insignificant it may seem. Tracking your time is going to serve you well in two ways. First, it will allow for you to give your customers realistic SLAs for a group of specific requests. Second, it helps you to better manage the expectations that will be set upon you by your customers. Think about how crucial those two items are. You will be on your way to delivering what is needed, on time, and with value. A residual effect is that this will allow you to sit with your customers to get details on their requests. If you have demonstrated that you are able to provide quality support, then it is easier to have your customers spend an extra 5 minutes explaining some details to you that will help you to resolve their issue. That is better than the alternative, where they do not want to spend any extra time than necessary and just want you to fix something, and now.

Here s a possible definition for an operator called DOUBLER that takes an integer and doubles it: OPERATOR DOUBLER ( I INTEGER ) RETURNS INTEGER ; RETURN ( I + I ) ; END OPERATOR ; DOUBLER is a read-only operator (it doesn t update anything); it s explicitly declared to be of type INTEGER (see the RETURNS clause), meaning the value it returns when it s invoked is an integer The sole parameter I is also explicitly declared to be of type INTEGER, meaning the argument that corresponds to that parameter when the operator is invoked must be an integer value 4.

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A thick client is the opposite of a thin client. Sometimes this type of application houses all three layers on the client desktop. Thick clients are dynamic and offer users a rich experience. The disadvantages to this type of application include more difficult deployments and poor maintenance and versioning options. Note that the difficulties in deployment and updates led technology decision makers to choose thin clients in the past decade. The tables are turning, however. With the release of Visual Studio 2005, you have a technology that allows you to deploy rich client applications using a thin client deployment model (ClickOnce).

Alternatively, we could make the doubling operator an update operator instead: OPERATOR DOUBLEU ( I INTEGER ) UPDATES { I } ; I := ( I + I ) ; END OPERATOR ; Operator DOUBLEU has no declared type and returns no value when it s invoked (there s no RETURN statement, and the RETURNS clause has been replaced by an UPDATES clause, showing that arguments corresponding to the parameter I are subject to update) The argument that corresponds to the sole parameter I when the operator is invoked must be an integer variable specifically The assignment operation causes that variable to be updated appropriately Note: It follows that DOUBLEU(V), where V is an integer variable, doesn t have a type, doesn t have a value, and more generally isn t regarded as an expression Hence the operator must be invoked by means of an explicit CALL statement eg.

, CALL DOUBLEU(V); or something equivalent 5 In contrast to the foregoing, DOUBLER(v), where v is an integer value, does have a type (INTEGER), does have a value (an integer), and is regarded as an expression in fact, it can appear wherever an integer literal is allowed Here s an example: ( 5 * DOUBLER ( J ) ) + DOUBLER ( K - 4 ) This expression has a type, too: namely, the type of the outermost operator involved, which happens to be PLUS ( + ) in this example..

Note: To avoid some possible confusion, I should explain that simple literals and simple variable names are both legal expressions. The outermost operator involved in, e.g., the expression 3 is a literal reference, and it s of the obvious type. Likewise, the outermost operator involved in, e.g., the expression N is a variable reference, and it too is of the obvious type. 6. Finally, consider the following relation type: RELATION { P# P#, PNAME NAME, COLOR COLOR, WEIGHT WEIGHT, CITY CHAR } This relation type involves five attributes P#, PNAME, COLOR, WEIGHT, and CITY, of types P#, NAME, COLOR, WEIGHT, and CHAR, respectively. (Don t worry if this example doesn t make too much sense to you yet. I ll have more to say about relation types later in this chapter, in the section Relation Values and Variables. )

Smart clients offer the benefits of both a thin client and a thick client (refer to Figure 1-1). Essentially, if you take all of the advantages of having a thin client and combine them with the benefits of a thick client while throwing away their disadvantages, you end up with a smart client.

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