Managing table space incremental image copies
In certain situations,
does not allow you to make an incremental copy until a full image copy has been made; in some of those situations,
automatically escalates your incremental copy request to a full copy request.
If you use the FULL AUTO option instead of FULL NO, or if you use the CHANGELIMIT option,
escalates your incremental copy request to a full copy when certain criteria that you specify are satisfied. See Escalating-incremental-copies-to-full-copies.
Even though you choose to merge an incremental copy with the most recent prior copy, you can specify that the prior copy be kept, that is, not be deleted from the SYSIBM.SYSCOPY table. As a result, the prior copy will still be available if you need it later for a point-in-time recovery.
provides the RECALL command to allow you to reinstate an incremental copy that was merged but not deleted from SYSIBM.SYSCOPY.
also optionally allows you to:
- Optimize the elapsed time required to make an incremental copy
- Register empty incremental copies (that is, register an incremental copy even though no pages changed since the last copy)
To accomplish incremental copy tasks,
provides the following options for use with FULL NO, FULL AUTO, and CHANGELIMIT:
- CUMULATIVE specifies whether to merge a requested incremental RESETMOD NO copy with the most recent prior incremental RESETMOD NO copy. See Merging-incremental-copies.
- KEEP specifies whether to delete the entry for the most recent prior incremental RESETMOD NO copy from SYSIBM.SYSCOPY. See Keeping-and-recalling-merged-incremental-copies.
- READTYPE allows you to choose the most efficient I/O method of reading the table space. See Optimizing-the-elapsed-time-for-an-incremental-copy.
- EMPTY specifies whether to register an empty incremental copy. See Registering-empty-incremental-copies.
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