SAS/ACCESS 9.2 for Relational Databases: Reference, Fourth Edition

574 Introduction to SAS/ACCESS Interface to Informix 4 Chapter 19Introduction to SAS/ACCESS Interface to InformixOverviewThis section describes SAS/ACCESS Interface to Informix. See “SAS/ACCESSInterface to Informix: Supported Features” on page 78 for a list of SAS/ACCESSfeatures that are available in this interface. For background information aboutInformix, see “Overview of Informix Servers” on page 588.Default EnvironmentWhen you access Informix tables by using SAS/ACCESS Interface to Informix, thedefault Informix read isolation level is set for committed reads, and SAS spooling is on.Committed reads enable you to read rows unless another user or process is updatingthe rows. Reading in this manner does not lock the rows. SAS spooling guarantees thatyou get identical data each time you re-read a row because SAS buffers the rows afteryou read them the first time. This default environment is suitable for most users. Ifthis default environment is unsuitable for your needs, see “Locking in the InformixInterface” on page 584.To see the SQL statements that SAS issues to the Informix server, include theSASTRACE= option in your code:option sastrace=’,,,d’;If you use quotation marks in your Informix SQL statements, set yourDELIMIDENT= environment variable to DELIMIDENT=YES or Informix might rejectyour statements. Because some SAS options that preserve case generate SQLstatements that contain quotation marks, you should set DELIMIDENT=YES in yourenvironment.LIBNAME Statement Specifics for InformixOverviewThis section describes the LIBNAME statement that SAS/ACCESS Interface toInformix supports and includes an example. For details about this feature, see“Overview of the LIBNAME Statement for Relational Databases” on page 87.Here is the LIBNAME statement syntax for accessing Informix.LIBNAME libref informix ;Argumentslibrefspecifies any SAS name that serves as an alias to associate SAS with a database,schema, server, or group of tables and views.