NetBase SQL Shadowing Handbook

User Exits NetBase SQL
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3-8 QUEST Software, Inc. ver A0195
dat A buffer containing all columns of the record concatinated
together. The description of the columns is found in the
"column_array". For UPDATE records, the original data is
stored here.
upd_data A buffer containing all updated columns. Unlike the "data"
buffer, this field contains only the updated columns. Note that
if a column was not updated, it will not appear in this buffer.
This is why the column number is specified in the
"update_array" field.
Note: If a transaction contains updates that will be sent to more than one computer, it is
necessary to send the BEGIN and COMMIT records to all remote nodes. Pairs of
BEGIN and COMMIT transactions with no intervening updates will be ignored by the
posting process.