Data Set Options for Relational Databases

READ_MODE_WAIT= Data Set Option

Specifies during SAS/ACCESS read operations whether Teradata waits to acquire a lock or fails your request when a different user has locked the DBMS resource.

Default value:	LIBNAME setting
Valid in:	DATA and PROC steps (when accessing DBMS data using SAS/ACCESS software)
DBMS support:	Teradata

Syntax
Syntax Description
Details
See Also

Syntax

READ_MODE_WAIT=YES | NO

Syntax Description

YES: specifies that Teradata waits to acquire the lock, and SAS/ACCESS waits indefinitely until it can acquire the lock.
NO: specifies that Teradata fails the lock request if the specified DBMS resource is locked.

Details

If you specify READ_MODE_WAIT=NO, and a different user holds a restrictive lock, then the executing SAS step fails. SAS/ACCESS continues to process 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 your desired lock. 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.

For more information, see locking topic in the Teradata section.