Configure SQL Performance Options

SQL query tuning in InterSystems IRIS involves configuring parallel query processing, enabling Runtime Plan Choice for dynamic optimization, and managing query plan caching to improve execution for large datasets.

Parallel query processing leverages multi-processor systems to execute queries concurrently, significantly reducing completion time for complex operations and large datasets. You need it when critical reporting queries take several minutes to run.

You enable Runtime Plan Choice (RTPC) to allow dynamic query plan optimization based on runtime data. This mechanism improves performance specifically for queries containing outlier values by adjusting execution paths dynamically.

Yes, you can manage frozen plans to maintain query execution performance stability across system upgrades or configuration changes. This prevents the optimizer from regenerating less efficient plans during environment updates.

Configuring auto parallel query processing is limited by hardware capabilities, requiring multi-processor systems to yield faster query completion. It may not suit simple queries or small datasets where parallelization overhead outweighs benefits.