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 option or the FIRSTOBS option is in a PROC or DATA step
• when the KEY option 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 specified
• if DBSLICEPARM=NONE