ORA-26840: Combined capture and apply optimization is disabled because string...

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ORA-26840: Combined capture and apply optimization is disabled because string is
unable to identify an apply for the source database "string".
Cause: There were multipleStreams apply processes using the same queue which
made combined capture and apply (CCA) optimization not possible.
Action: If Streamsperformance is an issue, check the "Combined Capture and
Apply Optimization" chapter in the "Oracle Streams Concepts and
Administration" book. Then reconfigure the Streams processes to meet this
optimization's requirements.