PSB directories (PDIRs)

If you are using DBCTL exclusively, you do not need to generate a PDIR for CICS®. Instead you must define PSBs and DMBs using the IMS macros APPLCTN and DATABASE respectively. (For information on the APPLCTN and DATABASE macros, see Generating DBCTL.)

If you want to function ship requests to a CICS system, at which the database manager may be DBCTL or remote DL/I (function shipping), you will need to generate a PDIR.

CICS routes DL/I requests to remote DL/I or DBCTL according to the PSB that is named. If the PSB appears in the CICS PDIR, the request is routed to remote DL/I (that is, function shipped to another CICS system). If the PSB does not appear in the CICS PDIR, and CICS is connected to DBCTL, CICS routes the request to DBCTL. In addition, if the PSB appears in the PDIR and specifies a SYSID that matches the local SYSID, the request is routed to DBCTL.