Materialized Views: how can I find the number of updates, inserts, delete

We are using Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Prod.
In a materialized view, with fast incremental refresh, done after every 5 minutes automatically, I want to store in a logging table the number of rows inserted,updated and deleted in the materialized view by that refresh.
One option is to create a job that should read the materialized view log table just before the refresh and store the required information in the logging table. But this information may not be accurate.
Is there any other way to collect this information for each refresh?

Use auditing, or an before insert/update/delete trigger, that updates a counter
I hate myself for giving this advice, because it will bring you problems, with the MV update/refresh speed, table lock contention on the log-table....
Be carefull !!
Why not use auditing on the source table and why does anyone wants to know the number of changes??
Regards
FJFranken

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