Answer Posted / nagaraj ramamoorthy
The purpose of the SYNC clause (when it was introduced) was
to align the data names to the natural machine word
boundaries so that it will be efficient to retrieve data.
This was introduced when the processing speed was very slow
and system was built on word architecture. Modern systems
are quite fast and this does not make significant
difference.
It can be used to numeric and alphanumeric data items. you
can also specify how to align RIGHT/LEFT. if you do not
specify, complier will take the best one that is efficient.
It should be used with 01 and 77 levels and it should not
be used with group items, because compiler will add
bits/bytes in between group items so finding the exact size
will be difficult for the programmer.
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