Dynamic installation and uninstallation

• the standard JCL method (described on Modifying the IMS control region JCL)

• the dynamic install function described in this section

If you use the dynamic install function to install the products, you do not need to modify the standard IMS JCL. MVIMS and MainView AutoOPERATOR for IMS data sets are not required in STEPLIB, and the IMFPARM DD and BMCPSWD DD statements are not necessary.

However, the recommended procedure is to use the standard JCL method to install the products, so that MVIMS Online and MainView AutoOPERATOR for IMS are always available when IMS is initialized. Then you can use the dynamic uninstall and install functions to implement MVIMS Online maintenance while IMS is still up and running.

If MVIMS backs itself out because of a software failure, you can use the dynamic uninstall and install functions to reinstall the product (after applying corrective maintenance, if appropriate) without having to stop and restart IMS.

If you plan to continue using the IMS control region JCL method to install MVIMS and MainView AutoOPERATOR for IMS as IMS initializes and you want to use dynamic uninstall and install to apply maintenance, follow these steps:

To use dynamic uninstall and install to apply maintenance

1. Run the ICOPYAOI job, which is provided in the BBSAMP data set. The job will copy members DFSAOE00 and DFSAOUE0 from your target library into a separate data set.
2. Change the IMS control region JCL:
   1. Replace the BBLINK data set in the STEPLIB concatenation with the new data set created by ICOPYAOI.
   2. Add an IMFLOAD DD pointing to the BBLINK data set.

      DFSAOE00 and DFSAOUE0 will be loaded from STEPLIB. The JCL install process loads MVIMS and MainView AutoOPERATOR for IMS modules from IMFLOAD. IMFLOAD is deallocated after installation is completed so that you can apply maintenance while IMS is up. After maintenance is applied, you can uninstall and reinstall MVIMS and MainView AutoOPERATOR for IMS to incorporate the new maintenance, without stopping and restarting IMS.