Execute parallel queries
To run queries in parallel, you must use the HCL Informix® parallel database query (PDQ) feature.
To take full advantage of the performance enhancement PDQ provides, you need to use fragmented tables; table fragmentation allows you to store parts of a table on different disks.
See the IBM® Informix Performance Guide for information about these topics. The IBM Informix Performance Guide contains topics that describe how the database server executes queries in parallel and how you can manage running queries in parallel; it also includes topics that describe how to work with fragmented tables.