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Don Burleson Blog 







OGG-01296 Error mapping from tips

Oracle Database Tips by Donald BurlesonMarch 25, 2016

Question:  I started the GoldenGate replicat in target then I get the OGG-01296 error below:

OGG-01296 Error mapping from xxx to yyy

How do I fix the OGG-01296 error?

Answer:  The OGG-01296 error is caused my several things:

- Missing indexes:  We have created all the indexes on the target side (Replicat database) for the table.

- Non matching table columns:  The columns must match in both tables (source and target)

- Missing PK constraints:  All constraints must match on target and source.

 In sum, the OGG-01296 is when there is a mismatch between the structure of the tables in source and target, making the mapping fail.  The OGG-01296 is also fixed by adding TRANDATA for the table for the keycols. You can also fix the OGG-01296 by the source for primary key or unique columns and add the same to replicat param file and restart it

GoldenGate builds a pseudo key out of the entire row in the absence of a declared PK or UI, so for the source, the key is all the table columns.

For the target, the key becomes all of the target columns, including the ones that are only in the target and not in the source. So when an Update or Delete DML comes through GoldenGate from the source, there's no values for those last few columns in the target to satisfy the WHERE condition because those columns don't exist on the source.

If your source and target tables are different structures, you should use SOURCEDEFS instead of ASSUMETARGETDEFS, and you will need a DEFSFILE from the source and placed in the target

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