aws dms table error

AWS DMS ( Data Migration Service ) task has been running for many hours, then failed with error “Table error” for Load State.

1)Check target database,  99% records have been migrated from Oracle source database to PostgreSQL RDS.

2)Check task log with bellow error:

00:04:00 2018-10-01T00:04:00 [SOURCE_UNLOAD ]E: ORA-01555: 
snapshot too old: rollback segment number 918 with name 
"_SYSSMU918_239767949$" too small [1020436] (oracle_endpoint_unload.c:226)

SOLUTION

Add more space to UNDO tablespace, and/or increase the value of parameter “undo_retention” for source Oracle database.

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