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without any input parameters, conforms to the SQL2 standard. If the dynamic query specified parameters, they could be passed to the DBMS either as a series of host variables or via a SQL2 descriptor. The SQL2 OPEN statement using host variables is identical to the DB2 style, shown in the program in Figure 18-13. The SQL2 OPEN statement using a descriptor is parallel to the SQL2 EXECUTE statement using a descriptor, and differs from the DB2 style. For example, the OPEN statement of Figure 18-14:

OPEN qrycursor USING DESCRIPTOR :parmda;

is changed for SQL2 into this OPEN statement:

OPEN qrycursor USING SQL DESCRIPTOR parmdesc;

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where it will t or be split with the expanded part of the row placed in a new location, connected to the original location by a pointer. Both of these situations are not only expensive when they occur but are also detrimental to the performance of subsequent queries that touch those rows. Table reorganizations can resolve the issue, but it s better to prevent the problem by designing the application so that rows tend not to grow in size after they are inserted. DELETE statements are the least likely to present performance issues. However, a table that participates as a parent in a relationship that is de ned with the ON DELETE CASCADE option can perform poorly if there are many child rows to delete. Moreover, index maintenance also comes into play here because index entries must be removed for any deleted rows.

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The technique for passing input parameters to the OPEN statement via the SQL2 descriptor is exactly the same as that described earlier for the EXECUTE statement. Like the Oracle implementation of dynamic SQL, the SQL2 standard provides a way for the host program to obtain a description of the parameters in a dynamic query as well as a description of the query results. For the program fragment in Figure 18-14, this DESCRIBE statement:

DESCRIBE INPUT querystmt USING SQL DESCRIPTOR parmdesc;

will return, in the SQL2 descriptor named parmdesc, a description of each of the parameters that appears in the dynamic query. The number of parameters can be obtained with the GET DESCRIPTOR statement, retrieving the COUNT item from the descriptor. As with the Oracle implementation, the SQL2 standard can have two descriptors associated with a dynamic query. The input descriptor, obtained with the DESCRIBE INPUT statement, contains descriptions of the parameters. The output descriptor contains descriptions of the query results columns. The standard allows you to explicitly ask for the output description:

would be a great time to crack open the solar cooker and make the rest of the campsite jealous! You really want to cook on days when the sky is clear and the sun can easily be seen on a cloudy day, cooking will be painfully slow. One of the great things about solar cooking is that you can prepare everything in advance, leave it in your solar cooker, and when you return everything is cooked ready to eat whereas your accomplices cooking with traditional methods still have to muck about and cook their food! Also think like this if you are cooking using conventional energy inside a home that is air conditioned, for every kWh of energy you input to your cooker, your air conditioning will use about another three trying to remove that heat from your home!

DESCRIBE OUTPUT querystmt USING SQL DESCRIPTOR qrydesc;