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

Data Set Options for Relational Databases 4 DBINDEX= Data Set Option 303ExamplesIf you specify DBGEN_NAME=SAS, SAS renames a DBMS column named Dept$Amtto _COLn. If you specify DBGEN_NAME=DBMS, SAS renames the Dept$Amt column toDept_Amt.See AlsoTo assign this option to a group of relational DBMS tables or views, see the“DBGEN_NAME= LIBNAME Option” on page 124.“VALIDVARNAME= System Option” on page 423DBINDEX= Data Set OptionDetects and verifies that indexes exist on a DBMS table.Default value: DBMS-specificValid in: DATA and PROC steps (when accessing DBMS data using SAS/ACCESSsoftware)DBMS support: Aster nCluster, DB2 under UNIX and PC Hosts, Greenplum, HP Neoview,Informix, Microsoft SQL Server, MySQL, Netezza, ODBC, OLE DB, Oracle, Sybase,Sybase IQ, TeradataSyntaxDBINDEX=YES | NO | index-nameSyntax DescriptionYEStriggers the SAS/ACCESS engine to search for all indexes on a table and return themto SAS for evaluation. If SAS/ACCESS finds a usable index, it passes the joinWHERE clause to the DBMS for processing. A usable index should have at least thesame attributes as the join column.NOno automated index search is performed.index-nameverifies the index name that is specified for the index columns on the DBMS table. Itrequires the same type of call as when DBINDEX=YES is used.DetailsIf indexes exist on a DBMS table and are of the correct type, you can use this option topotentially improve performance when you are processing a join query that involves alarge DBMS table and a relatively small SAS data set that is passed to the DBMS.CAUTION:Improper use of this option can impair performance. See “Using the DBINDEX=,DBKEY=, and MULTI_DATASRC_OPT= Options” on page 48 for detailedinformation about using this option. 4