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COMPATIBILITY NO_DATAMAP_CHECK
When an index file is opened by an ISAM file open function, if the index is already open and is associated with a data file, FairCom DB checks if the index is associated with a different data file than the data file that is involved in the current file open operation. If so, the open now fails with error DMAP_ERR (957, this index file is already mapped to a different data file). This keyword disables the new approach (no check for mapping to the same data file as the currently-mapped file).
