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Good policies will answer the following questions: w s s s s s s What is the best way to report a problem or request a change from IT How/when will IT inform me if network services will be unavailable for a specific amount of time How will IT deal with unplanned downtime Is my server-based data being backed up regularly May I request that my local workstation be backed up What is the expected turnaround time of a help desk ticket on an issue I call in How are calls prioritized How can I check the status of an overdue request What are the support boundaries for the IT department In addition to troubleshooting and systems management, decide whether help desk staff should be responsible for teaching users how to use applications.

In 4, I discussed null values and how they re used to represent unknown or unavailable data. As you ll recall from that discussion, most SQL columns, by default, permit null values, although you can override the default by defining a NOT NULL constraint on the column. However, if you don t override the default and null values are permitted, you can run into a problem with the host language because most application programming languages do not support null values. To work around this issue, SQL allows you to declare indicator host variables. An indicator host variable is a type of variable that accompanies a regular host variable, also referred to as a data host variable. For simplicity, I refer to these two types of host variables as just indicator variables and data variables. The indicator variable contains a value that specifies whether or not the value in the associated data variable is null. Indicator variables are declared in the same way as other host variables. Let s take a look at an example of indicator variables to illustrate how they work. In the following embedded SELECT statement, an indicator variable has been added to each of the data variables in the INTO clause:

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As previously stated, you should always close the cursor when the program no longer needs it because this frees up any resources the cursor has used, including memory for buffers. The CLOSE statement is as simple as the OPEN statement:

How long will typical calls take to address Which types of issues take priority over others It s good to have a set priority for expected events, such as moves, additions, and changes, and a separate plan for troubleshooting problems that prevent multiple users from working How can a user check on the status of a help request If the request is not fulfilled on time, with whom can the user talk.

EXEC SQL SELECT INTO FROM WHERE CD_NAME, IN_STOCK :v_CD_NAME :ind_CD_NAME, :v_IN_STOCK :ind_IN_STOCK CD_INVENTORY CD_ID = :v_CD_ID;

The INTO clause includes two indicator variables: ind_CD_NAME and ind_IN_STOCK. Notice that each indicator variable follows the associated data variable. The placement of the indicator variable is the only indication the SQL implementation has that a particular host variable is an indicator variable. There is nothing in the variable declaration or naming that distinguishes indicator variables from data variables. When the implementation sees that one variable follows the other and that no comma separates the two, the implementation assigns a value of 0 to the indicator variable if the associated variable contains a real value (is not null). If the associated variable contains a null value, the implementation assigns a value of -1 to the indicator variable. The host program then takes the appropriate action based on this information. It is essential that the host program test the indicator variables for null values before attempting to use the values in the host variable because when nulls are encountered, the value of the corresponding host variable is not changed and thus could contain leftover values from a previous statement or unknown data that programmers call garbage.

Addressing these issues in advance not only states the service level attempted by IT, but also sets concrete goals for IT personnel. Many organizations have found that provid-

CLOSE overdue_rentals;

17:

When you declare an indicator variable, be sure to use a numeric data type that supports the 0 and -1 values. The value 0 is logically a false condition because all bits will be set to a binary 0, while the value -1 is logically a true condition because all bits will be set to a binary 1.

ing help desk personnel with daily and weekly statistics helps keep the group focused, motivated, and goal-oriented. It also offers management the feedback required to judge performance of IT staffers during regular reviews.

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