Threaded Reads

When Threaded Reads Do Not Occur

Threading does not occur under these circumstances:

when a BY statement is used in a PROC or DATA step
when the OBS or the FIRSTOBS option is in a PROC or DATA step
when the KEY or the DBKEY option is used PROC or DATA step
if no column in the table exists to which SAS can apply the MOD function. For more information, see Autopartitioning Techniques in SAS/ACCESS.
if all columns within a table to which SAS can apply the MOD function are in WHERE clauses. For more information, see Autopartitioning Techniques in SAS/ACCESS.
if the NOTHREADS system option is set
if DBSLICEPARM=NONE