merging into MapFile

[yoav.morag]

hi all -
can anyone comment on the performance cost of merging many small files into
an increasingly large MapFile ? will that cost be dependent on the size of
the larger MapFile (since I have to rewrite it) or is there a built-in
strategy to split it into smaller parts, affecting only those which were
touched ? 
thanks -
Yoav.
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