CICS VSAM Transparency for z/OS, Version 1.2


Requesting a read-only DDM

The default DDM contains SQL to support all the possible calls you can make to a VSAM data set. In certain circumstances, you may want to restrict access to prevent data updates, and CICS® VT provides the ability to generate a read-only DDM facility for this purpose.

You request a read-only DDM in the manual mapping dialogs. Select the DIM and specify U to update the DIM mapping. This display the screen shown in Figure 1:

Figure 1. Data set mapping
                          
--------------------- CICS VT: Update data set mapping ------------------------
 Command ===> ________________________________________________ Scroll ===> CSR_ 
                                                                                
 DIM name        :dim-name                                                          
                                                                                
                                                                                
 File information:                                                              
                                                                                
   VSAM filetype  .  ===> KSDS               (KSDS,KSDV,RRDS,RRDV)              
   Record length ..  ===> 04096              (Maximum in bytes)                 
   Fill character .  ===> __                 ("FF","00",blank)                  
                                                                                
 CICS VT information:                                                           
                                                                                
   DB2 table:             (Look-up available)                                   
     Table creator   ===> DBADM............................................... +
     Table name . .  ===> DB2-table........................................... +
                                                                       
                                                                  
 Read Only DDM       ===> module________           (Optional)           
                                                                  
                                                                  
 Press: Enter=Update  PF3=Exit                                                                                      

Specify the name of the read-only DDM you want to generate. You can specify any valid name.

The DB2® bind parameters for the read-only DDM come from the skeleton bind member that you specify in the mapping defaults panel 3, shown in Specifying mandatory defaults panel 2. The read-only DDM is automatically generated when you generate the DIM and read-write DDM.

See VSAM file DD statement changes for the JCL changes that are required to use the read-only DDM at run time.





Last updated: May 25, 2012 20:44:5