Home
AdministeringIn addition to administering the database server, you can tune performance, replicate data, and archive data.
System administrationThese topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL Informix® database servers.
Performance GuideThe Informix® Performance Guide describes how to configure and operate your HCL Informix® database server to improve overall system throughput and to improve the performance of SQL queries.
Parallel database query (PDQ)You can manage how the database server performs PDQ and you can monitor the resources that the database server uses for PDQ.
Database server operations that use PDQInformix® processes some types of SQL operations that the database server processes in parallel. However some situations limit the degree of parallelism that Informix® can use.
Hold cursors that use PDQWhen hold cursors that are created by declaring the WITH HOLD qualifier have no locks, PDQ is enabled.

Hold cursors that use PDQ

When hold cursors that are created by declaring the WITH HOLD qualifier have no locks, PDQ is enabled.

PDQ will be set for hold cursors in the following cases:

Queries with Dirty Read or Committed Read isolation level, ANSI, and read-only cursor
Queries with Dirty Read or Committed Read isolation level, NON-ANSI, non-updateable cursor

Rate this topic

5 stars 4 stars 3 stars 2 stars 1 star

Comment on this topic.

By clicking this box, you acknowledge that you are NOT a U.S. Federal Government employee or agency, nor are you submitting information with respect to or on behalf of one. HCL provides software and services to U.S. Federal Government customers through its partners immixGroup, Inc. Contact this team at https://hcltechsw.com/resources/us-government-contact. Do not include any personal data in this Comment box.