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

398 UPDATE_MODE_WAIT= Data Set Option 4 Chapter 11UPDATE_MODE_WAIT= Data Set OptionSpecifies during SAS/ACCESS update operations whether the DBMS waits to acquire a lock or failsyour request when a different user has locked the DBMS resource.Default value: LIBNAME settingValid in: DATA and PROC steps (when accessing DBMS data using SAS/ACCESSsoftware)DBMS support: TeradataSyntaxUPDATE_MODE_WAIT=YES | NOSyntax DescriptionYESspecifies that Teradata waits to acquire the lock, so SAS/ACCESS waits indefinitelyuntil it can acquire the lock.NOspecifies that Teradata fails the lock request if the specified DBMS resource is locked.DetailsIf you specify UPDATE_MODE_WAIT=NO and if a different user holds a restrictivelock, then your SAS step fails and SAS/ACCESS continues the job by processing thenext step. If you specify UPDATE_MODE_WAIT=YES, SAS/ACCESS waits indefinitelyuntil it can acquire the lock.A restrictive lock means that a different user is holding a lock that prevents you fromobtaining your desired lock. Until the other user releases the restrictive lock, youcannot obtain your lock. For example, another user’s table-level WRITE lock preventsyou from obtaining a READ lock on the table.Use SAS/ACCESS locking options only when Teradata standard locking isundesirable.For more information, see the locking topic in the Teradata section.See AlsoTo assign this option to a group of relational DBMS tables or views, see the“UPDATE_MODE_WAIT= LIBNAME Option” on page 196.“Locking in the Teradata Interface” on page 832UPDATE_SQL= Data Set OptionDetermines which method to use to update and delete rows in a data source.Default value: LIBNAME setting