Features and Benefits
IMS Online Reorganization Facility provides all of the necessary reorganization procedures (unload, reload, prefix resolution, prefix update, secondary index building, and image copy) in one simple step. It also provides optional pointer checking and ACB or DMB replacements.
IMS Online Reorganization Facility for z/OS:
Enables reorganization of IMS full function and High Availability Large Databases (HALDB) databases with an outage of only seconds (a period of time called takeover time).
Reorganizes databases to shadow data sets, captures any changes that occur during this period, and applies these changes to the reorganized shadow data sets.
Requires databases and their data sets to be registered to DBRC.
Reorganizes HISAM, HIDAM, HDAM, and SHISAM databases and recreates associated index data sets.
Reorganizes PHIDAM and PHDAM databases as single partitions.
Makes selected DBD changes during the reorganization process which will automatically be propagated to the participating online systems without the need of launching an online change.
Allows predefinition of the period when takeover may occur.
Supports batch message processing programs (BMPs) that allow you to pause BMPs during /DBRECOVERY commands.
Supports CICS & OTMA applications that quiesce database access during /DBRECOVERY commands.
Provides reorganization of all HALDB partitions in single job step as well as support for HALDBs with internal logical relationships.
Contains the ability to reorganize just an index (including PSINDEX) database while it remains online and the ability to unload a database while it is being updated online.
IMS Online Reorganization Facility provides the following benefits:
Increase database availability - All database changes are captured and applied while the databases are being reorganized. You do not need to take the databases offline to perform the reorganization.
Improve performance - Provides high-performance by streamlining parameter setting and running tasks in parallel.
Simplify your JCL – Saves time and eliminates the difficulty that is involved with writing DD statements by dynamically allocating the database data sets with DBRC, and dynamically allocating image copy data sets and other output data sets by using control statements.
Achieve a one-step reorganization process - By automatically invoking other required reorganization utilities in a single reorganization step, IMS Online Reorganization Facility saves DBA resources and CPU time, and most importantly, significantly increases database availability.
Create compatible data - Data created by IMS Online Reorganization Facility are compatible with IMS standard utilities. The optional HD unload data set and the DFSURWF1 data set (that is created only for internal logical relationships and not for secondary indexes) are examples of data sets that are compatible with the IMS standard utilities.
Automate replacement of DBDs and ACBs or DMBs - DBD changes are supported during the reorganization process and do not require any manual intervention after the reorganization.
