Explanation: FCINCREMENTALLAST is an optional keyword that can be used with EXECUTE. 
It can be specified with the optional subparameter
ALL.
FCINCREMENTALLAST(ALL) causes a new incremental of the
oldest copy to be taken and the persistent relationships of that copy to be withdrawn.
Relationships of all other backup copies are withdrawn after the next increment is taken of
each of those copies. Relationships of any new incremental copies created subsequent to the
command being issued are persistent, that is, they are not impacted by the previous
FCINCREMENTALLAST(ALL) request.
FCINCREMENTALLAST without the ALL subparameter
causes a new increment to be taken of the oldest backup copy, and then the persistent
relationships of only that copy to be withdrawn. If the FCINCREMENTAL(ALL) keyword was previously specified
for the same copy pool then when this copy rolls off, it is replaced with a new incremental
copy.