How IRE working on multiple identifer

[kevin33]

Hi, All , I have question how IRE working when import data through HUB ETL. 

Let's say I have a data put into server class.

in server class, identifier is object id ,100; name 200.

when data incoming , it contain object id value, when IRE did not find match object id, will it looking for name in next or it will create a record with the new object id?

example:  we have server record like:

Object id: 12345678

name: ABCDEF

when HUB STL transform a data which is 

Object id: 4567890

Name: ABCDEF

What's the IRE behavior, would it create a new record with Object id: 4567890, or it update the record with Name: ABCDEF

I got confuse because I see duplicated record with same name but different object id, I was expecting the exist record got update instead create a new one.

Thank you for any help. 

[Dr Atul G- LNG]

Hi @kevin33 

An identification rule applies to a CI class and consists of a single CI identifier and one or more identifier entries and related entries, each with a different priority. Each identifier entry defines a unique attribute set with a specific priority and each related entry defines rules for identifying related items. Create strong identification rules that are set with the highest priority for the strongest identifier entries and related entries. Docs

You can refer the video where the author has explained about the same.

[Ashok Sasidhara]

When data is loaded into any CI classes using any method which supports IRE, ServiceNow IRE will evaluate the identifier entries defined for that CI class in the order of priority. If a match is found based on any identifier criterion attribute, the CI will be updated. Only if match is not found based on any of the defined identifier entries, a new CI will be created. 

I have explained this topic in detail in the following article:

https://servicenowguru.com/cmdb/servicenow-cmdb-identification-and-reconciliation-engine-ire/