Replicat for trail file formats prior to 12c (188.8.131.52)
ASSUMETARGETDEFS parameter when the source and target objects specified in a
MAP statement have identical column structure, such as when synchronizing a hot site. It directs Oracle GoldenGate to assume that the data definitions of the source and target objects are identical, and to refer to the target definitions when metadata is needed for the source data.
When source and target tables have dissimilar structures, do not use
ASSUMETARGETDEFS. Create a data-definitions file for the source object, and specify the definitions file with the
SOURCEDEFS parameter. See SOURCEDEFS for more information. Do not use
SOURCEDEFS in the same parameter file.
See Administering Oracle GoldenGate for more information about metadata and how it applies to Oracle GoldenGate.