Both the problem and solution are Oracle specific.
The first import works as expected, but following imports are very slow. The problem is in the Oracle statistics, and the execution plan which Oracle uses for the query (you might see that the Nested Loops join strategy is used, but this join method should only be used while processing a smaller number of records). The problem can be fixed by updating the Oracle statistics using the following script.
Note that value SCHEMA_USERNAME should be changed.
This script should cause Oracle to use a different JOIN strategy while processing the queries for RDM tables. Make sure to check that the script changed in Oracle statistics after it is executed.
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