Change function overview
Restructuring a DEDB by using the change function yields less I/O, processing time, and downtime than other DEDB restructuring methods.
Note
The change function restructures DEDBs in offline mode only.
The change function can be used to change the number of areas in a DEDB, resize an area, resize the root addressable area (RAA) of an area, insert or remove segment types, or change the randomizer in a DEDB. If the DEDB uses data compression, you can add, change, or remove the compression.
If you have created an index or indexes to the DEDB by using the BMC Fast Path Indexer/EP product, you can also rebuild any (and all) indexes that are registered for the DEBD at the same time that the change function is performed.
Restructure options
The Fast Path Offline Suite offers different methods for changing the structure of a DEDB.
Change
In most instances, the change function that is provided by Fast Path Reorg/EP is a more efficient method of restructuring a DEDB than unload/reload processing.
The change function reads an area directly from DASD or from an image copy and writes the restructured DEDB directly to DASD. Writing directly to DASD potentially can save I/O, processing time and downtime.
Unload and reload
Fast Path Reorg/EP also includes unload and reload functions to perform the database change. The unload and reload functions provide significant advantages when compared to other unload/reload processing utilities.
For more information, see Unloading and Reloading a DEDB.
Reorganize and extend
Another restructuring option offered by Fast Path Reorg/EP is the offline space extend feature that is available with the reorganize function. If an out-of-space condition is imminent in IOVF or SDEP, this feature lets you extend the IOVF and SDEP portions of a DEDB during a reorganization. For more information, see Reorganization of a DEDB.
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