High-Risk Data Will Cause the Most Dedupe Headaches
Typically, high-risk records have more things pointing to them. If that record disappears, there are more orphaned references. In most CRM systems, the account is by definition the highest-risk table - and several outside systems likely point to its records. You may determine that accounts really can't be merged. Then what?
Most CRM systems have a concept of a parent account. That can be the basis of a solution strategy for accounts that can't be merged. The duplicate accounts all become children of a new master account, which acts as a "holding company" of sorts for roll-ups.
No doubt about it, duplicate records in CRM systems are the most popular form of data corruption. Unfortunately, data deduplication isn't an event. It's a process. Even if you get them all out of the system now, there's going to be a software or process change that will cause a new pattern of duplicates to be created. Since it will be easier to clean them up if there's only one error pattern, a thorough duplicate detection cycle will be needed on a monthly basis.
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