DB2 developer's guide by Craig Mullins

By Craig Mullins

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The term sargable is ostensibly obsolete and has been replaced in the IBM literature by the term Stage 1 processing. A predicate that can be satisfied by Stage 1 processing can be evaluated by the Data Manager portion of DB2, not the Relational Data System. The Data Manager component of DB2 is at a level closer to the data than the Relational Data System. " Because a Stage 1 predicate can be evaluated at an earlier Stage of data retrieval, you avoid the overhead of passing data from component to component of DB2.

Dynamic SQL Dynamic SQL is embedded in an application program and can change during the program's execution. Dynamic SQL statements are coded explicitly in host-language variables, prepared by the application program, and then executed. DSNTEP2, DSNTIAUL, QMF, and SPUFI are examples of programs that execute dynamic SQL statements. - 37 - Recall that the two types of SQL are static SQL and dynamic SQL. The primary difference between static and dynamic SQL is described capably by their names. A static SQL statement is hard-coded and unchanging.

Sometimes, by altering the way in which a SQL statement is written, you can influence DB2 to choose a different access path. Furthermore, data in your DB2 tables may change dramatically over time. It is not always feasible or practical to re-run RUNSTATS and rebind plans every time data changes. In cases such as these, SQL tweaking may be a valid technique. The danger in coding SQL to take advantage of release-dependent features lies in the fact that DB2 continues to be enhanced and upgraded. If a future DB2 release changes the performance feature you took advantage of, your SQL statement may degrade.

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