IBM® Informix® performs some types of update operations in parallel.
The database server takes the following two steps to process UPDATE statements:
1. Fetches the qualifying rows.
2. Applies the action of updating.
The database server performs the first step of an UPDATE statement in parallel, with the following exceptions:
- The UPDATE statement contains an OR clause and the optimizer chooses an OR index to process the OR filter.
- The UPDATE statement contains a subquery that the optimizer converts into a join.
Rate this page:
Copyright and trademark information
IBM, the IBM logo and ibm.com are trademarks of International Business Machines Corp., registered in many jurisdictions worldwide. Other product and service names might be trademarks of IBM or other companies. A current list of IBM trademarks is available on the Web at "Copyright and trademark information" at www.ibm.com/legal/copytrade.shtml.