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

Macro Variables and System Options for Relational Databases 4 DBIDIRECTEXEC= System Option 405DBIDIRECTEXEC= System OptionLets the SQL pass-through facility optimize handling of SQL Statements by passing them directlyto the databases for execution.Default value: NODBIDIRECTEXECValid in: configuration file, SAS invocation, OPTIONS statement, SAS System OptionswindowDBMS support: Aster n Cluster, DB2 under UNIX and PC Hosts, DB2 under z/OS,Greenplum, HP Neoview, Informix, Microsoft SQL Server, MySQL, Netezza, ODBC,OLE DB, Oracle, Sybase, Sybase IQ, TeradataSyntaxDBIDIRECTEXEC | NODBIDIRECTEXECSyntax DescriptionDBIDIRECTEXECindicates that the SQL pass-through facility optimizes handling of SQL statementsby passing them directly to the database for execution, which optimizes performance.Using this option, you can process CREATE TABLE AS SELECT and DELETEstatements.NODBIDIRECTEXECindicates that the SQL pass-through facility does not optimize handling of SQLstatements.DetailsYou can significantly improve CPU and input/output performance by using this option,which applies to all hosts and all SAS/ACCESS engines.Certain database-specific criteria exist for passing SQL statements to the DBMS.These criteria are the same as the criteria that exist for passing joins. For details foryour DBMS, see “Passing Joins to the DBMS” on page 43 and “When Passing Joins tothe DBMS Will Fail” on page 45.When these criteria are met, a database can process the CREATE TABLE table-nameAS SELECT statement in a single step instead of as three separate statements(CREATE, SELECT, and INSERT). For example, if multiple librefs point to differentdata sources, the statement is processed normally, regardless of how you set this option.However, when you enable it, PROC SQL sends the CREATE TABLE AS SELECTstatement to the database.You can also send a DELETE statement directly to the database for execution, whichcan improve CPU, input, and output performance.Once a system administrator sets the default for this option globally, users canoverride it within their own configuration file.When you specify DBIDIRECTEXEC=, PROC SQL can pass this statement directlyto the database:CREATE TABLE table-name AS SELECT query