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Quest SQL Optimizer for IBM® DB2® LUWmaximizes SQL performance by automating the manual, time-intensive and uncertain process of ensuring that SQL statements are performing as fast as possible. SQL Optimizer analyzes, rewrites, and evaluates SQL statements within multiple database objects, files, or SQL statements captured by the DB2 Event Monitor. With SQL Optimizer, you can analyze and optimize all your problem SQL from multiple sources. SQL Optimizer also provides you a complete index optimization and plan change analysis solution, from index recommendations to simulated index impact analysis, through comparison of multiple SQL access plans.
SQL Optimizer provides you with the following main modules.
SQL Functions are available in evaluating index-set and SQL alternatives. These functions are:
Run Result (SQL alternatives only)
The access plan is a combination of steps the optimizer chooses in order to execute a SQL statement. It is the ordered set of steps required to carry out the query with the operators chosen for each table.
To view only the access plan of the original SQL statement
From the SQL Information pane, click .
Note: The Rewrite SQL, Generate Indexes, Run for All Records, Run for First Record, and Run Result functions also retrieve the corresponding access plan.