DB2 developer's guide by Craig Mullins

DB2 developer's guide by Craig Mullins

By Craig Mullins

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EXEC SQL OPEN CSR1 END-EXEC. CLOSE-CSR. EXEC SQL CLOSE CSR1 OPEN & CLOSE CURSOR STATEMENTS END-EXEC. To embed static SQL in a host program, you must prepare for the impedance mismatch between a highlevel language and SQL. Impedance mismatch refers to the difference between set-at-a-time processing and record-at-a-time processing. High-level languages access data one record at a time, whereas SQL accesses data at a set level. Although DB2 always accesses data at the set level, the host program uses a structure called a cursor to access the set-level data one row at a time.

As a general rule, updating the DB2 Catalog outside the jurisdiction of RUNSTATS should be considered only as a last resort. If SQL is used to update DB2 Catalog statistics, be sure to record and maintain the following information: ƒ The reason for the DB2 Catalog updates ƒ A description of the updates applied: Applied once; RUNSTATS never run again Applied initially; RUNSTATS run without reapplying updates Applied initially; RUNSTATS run and updates immediately reapplied ƒ The version and release of DB2 when the updates were first applied ƒ The SQL UPDATE and INSERT statements used to modify the DB2 Catalog ƒ A report of the DB2 Catalog statistics overlaid by the UPDATE statements (must be produced before the initial updates) DB2 Optimizer "Hints" Starting with DB2 Version 6, it is possible to use optimizer "hints" to achieve more control over the access paths chosen by DB2.

The program issues a PREPARE statement before executing dynamic SQL (with the exception of EXECUTE IMMEDIATE, which implicitly prepares SQL statements). PREPARE verifies, validates, and determines access paths dynamically. A program containing dynamic SQL statements still must be bound into an application plan or package. The plan or package, however, does not contain access paths for the dynamic SQL statements. DB2 provides four classes of dynamic SQL: EXECUTE IMMEDIATE, non-SELECT PREPARE, and EXECUTE, fixed-list SELECT, and varying-list SELECT.

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