There are two types of image copies:
1. A full image copy is a copy of all pages in a table space, partition, data set, or index space.
2. An incremental image copy is a copy only of pages that have been modified since the last use of the COPY utility.
The MERGECOPY online utility merges image copies produced by the COPY utility or inline copies produced by the LOAD or REORG utilities. It can merge several incremental copies of a table space to make one incremental copy. It can also merge incremental copies with a full image copy to make a new full image copy.