DFS3392W DL/I CF DATA CACHING INOPERATIVE FOR NNNNNNNNNNNNNNNN
Explanation
Data caching has been disabled for the OSAM structure named NNNNNNNNNNNNNNNN. This situation occurred because the IMS that connected to the CF structure first established a non-caching environment.
System action
IMS continues running without DL/I data caching.
System programmer response
Ensure that all IMS data sharing subsystems, whether Batch or Online, use the same structure and Caching Options (CO) when using OSAM DL/I Data Caching (ODC). These options are defined in either the DFSVSMxx PROCLIB members for Online, or in the DFSVSAMP DD cards for Batch with the CFNAMES and IOBF statements.
Failure to ensure structure consistency across IMS subsystems can result in data integrity or performance problems.
If all IMS subsystems are running with IMS Version 6.10 or later, IMS attempts to use the structure with the characteristics defined by the IMS that connected first. A subsequent IMS renders its own ODC inoperative when it detects, during connection, that the structure has no data elements for caching.
If you run IMS Version 6.10 subsystems with IMS Version 5.10 subsystems, the earlier version of IMS must connect to the structure first. ODC was not introduced until IMS Version 6.10, and IMS Version 5.10 cannot access cached data. Data integrity problems can result from different IMS subsystems using different copies of IOBF statements in DFSVSMxx/DFSVSAMP.
Problem determination
1, and save a copy of all DFSVSMxx or DFSVSAMP statements for all IMS sharing subsystems.