Reading a sequential file from an EE job into a server job
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When a VarChar is stored within osh it carries its length as a prefixed binary number, the size of which is specified by "prefix". A two-byte unsigned integer (uint16 or unsigned SmallInt) can address a string whose length is up to 2^16 characters. Longer strings require larger prefixes. {prefix=4} handles string lengths up to 2^32 characters (4GB if single-byte character set).
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Any contribution to this forum is my own opinion and does not necessarily reflect any position that IBM may hold.