DELTA PLUS IMS managed ACB support

From Version 14 or later of the IBM IMS system, you can manage the runtime application control blocks (ACBs) for databases and programs. When IMS managed ACB support is enabled, IMS does not require DBD, PSB, and ACB libraries.

The IMS directory is a set of system-managed data sets that are associated with an IMS catalog. You enable IMS managed ACB support with the ACBMGMT=CATALOG command option in the CATALOG section of the DFSDFxxx member. IMS then stores ACBs in the IMS directory. 

The IMS directory includes the following items:

• A data set for the active ACBs (directory)
• A staging data set that contains ACBs that are pending activation
• A boot strap data set that IMS uses to manage the IMS directory

DELTA PLUS reads the active directory data sets to get the runtime ACB/DMB blocks. 

When you restart the IMS control region, one the following messages informs you which IMSACB or IMSDIR IMS is using:

• DLP186060I IMS Directory read at RESTART to initialize ACBs/DMBs

• DLP186060I ACBLIBA read at RESTART to initialize ACBs/DMBs

• DLP186060I ACBLIBB read at RESTART to initialize ACBs/DMBs

Following is an example of the command output:

/DIS DLP OPTIONS

DFS4445I CMD FROM MCS/E-MCS CONSOLE USERID=RIHGLJ2: DIS DLP OPTIONS D14M  
DFS4444I DISPLAY FROM ID=D14M  741                                        
     DELTA PLUS PRODUCT LEVEL V2.7.00.00 FOR IMSID D14M (IMS 14.1)        
     -------------------------------------------------------------        
     IMS Options timestamp   : 17177-13:03:36                             
     IMS Options changed by  : RIHGLJ                                     
     IMS Options reloaded    : 0 times                                    
     IMS Options reloaded by :                                            
     Copy IMS Opt to RESLIB  : No                                         
     XRF/FDR Alternate IMSID :                                            
     DELTA PLUS Group        :                                            
     Copy Grp Opt to RESLIB  :                                            
+    DISPLAY / ZAP facility  : Display storage: Yes / Zap storage: Yes    
                                                                          
     BMCXLINK LUname         : SLJPLX                                     
     DELTALOG names          : SLJ.DLP.LOG1.D14M                          
                             : SLJ.DLP.LOG2.D14M                          
     HISTORYFILE names       : SLJ.DLP.HIST1.D14M                         
                             : SLJ.DLP.HIST2.D14M                         
     IMS Directory names     : SLJ.D14M.DFSCD000.DI1001                   
                             : SLJ.D14M.DFSCD000.DI1002     
     WTOR to continue RESTART: Yes      
Log CMDs to History file: Yes      
*2017235/100413*               

DELTA PLUS reads ACB/DMB runtime objects from the active directory at IMS control region restart. However, DELTA PLUS reads the active directory and IMS staging directory during DELTA PLUS List processing. If runtime objects are found in the IMS staging directory that match PSB or database elements in the DELTA PLUS List, DELTA PLUS copies these objects from the staging directory to the active IMS directory. 

After DELTA PLUS List processing completes, the IMS objects are removed from the staging directory. Any object in the IMS staging directory that does not match an element in the DELTA PLUS List remains in the IMS staging directory and is not copied to the active IMS directory.

The following informational message is displayed in ISPF or batch during DELTA PLUS List processing if the ACB or DMB in the IMS staging directory is to be copied to the active IMS directory:

DLP186425I ACB or DMB will be copied from staging IMSDIR to active IMSDIR

This section contains the following topic:

• Deploying PSB and DMB objects using IMS managed ACBs
• IMS Catalog and IMS Directory sharing across multiple IMS systems, on different LPARs