READ_MODE_WAIT= LIBNAME Option

During SAS/ACCESS Read operations, specifies whether Teradata should wait to acquire a lock or fail the request when a different user has already locked the DBMS resource.

Valid in:	SAS/ACCESS LIBNAME statement
Default:	none
Data source:	Teradata
See:	READ_MODE_WAIT= data set option, Locking in the Teradata Interface

Syntax

Details

Syntax

READ_MODE_WAIT=YES | NO

Syntax Description

YES: specifies for Teradata to wait to acquire the lock, so SAS/ACCESS waits indefinitely until it can acquire the lock.

NO: specifies Teradata fails the lock request if the specified DBMS resource is locked.

Details

If you specify READ_MODE_WAIT=NO and if a different user holds a restrictive lock, the executing SAS step fails. SAS/ACCESS continues processing the job by executing the next step.

If you specify READ_MODE_WAIT=YES, SAS/ACCESS waits indefinitely until it can acquire the lock.

A restrictive lock means that another user is holding a lock that prevents you from obtaining the lock that you want. Until the other user releases the restrictive lock, you cannot obtain your lock. For example, another user's table-level WRITE lock prevents you from obtaining a READ lock on the table.