Unit 3 of 4
Deduplication and Principal Classes
15 min
+150 points
Learning objectives
When you finish this unit, you will be able to:
- Identify how or why duplicate records are created and how to remediate them.
- Identify when and how to remediate duplicate records using the deduplication wizard.
- Identify how to define principal classes.
Duplicate records and principal classes
Duplicate CIs undermine trust in the CMDB and break downstream processes.
Why duplicates occur
- Overlapping discovery sources without proper IRE rules.
- Manual imports without matching logic.
- Integration changes that bypass identification rules.
Remediation
- Use the deduplication wizard when appropriate to merge or retire duplicate records.
- Define principal classes to establish which CI types are authoritative anchors in the CMDB model.
Exam focus: root causes of duplicates, when to use the deduplication wizard, and how principal classes support CMDB structure.