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Specify User Exit routine name when defining IMS-DB virtual table
In Japan, most IMS user customers, especially in financial sector, have their roll-your-own program modules called "DBI" (database interface), and database access must be made through DBI always. DBI provides, for example, data compression/de-compression by their own algorithm, and sometimes it does various complex data manipulation depending upon customer requirements.
Such customer needs to use their own Post-Read / Pre-Write User Exit routines together, when accessing their DVM virtual table.
However, customer cannot specify Post-Read / Pre-Write User Exit routine names when defining IMS/DBCTL or IMS-Direct virtual table so far.
DVM should be enhanced to provide ability to specify User Exit routine names when defining IMS-DB virtual table.
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