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Can we reset Matches and run again on match rule change or add a new match rule? 

Hi Sandeep

Yes, in a Dev environment you can reset the matching by removing the data, tweaking your match rules or by adding a new match rule and then re-load the data.

Regards, Peter

Hi Peter,

What we do in case it's Production with millions of records?

Thanks,
Sandeep

For Production, please take a look at this Community article 'How to reprocess existing data in production to apply new rules':
https://community.semarchy.com/post/how-to-reprocess-existing-data-in-production-to-apply-new-rules-5f0f2479a9d20108f7bd5710 

The job used to reprocess the data can have

• PARAM_ENABLE_DELETE_PHASE set to 0
• tasks checked only for "Enable matching" and "Enable Consolidation":