create de duplication tasks

[dick linschoten]

Servicenow creates deduplication tasks which works ok however there are lots of records in the cmdb that are also duplicates but where not initially identified as a duplicate. 

is there a way to reprocess the create deduplication task script to look for old entries to auto create the task,
I do have a ui action defined to manualy create the duplicates. but I would like to automate this.

[dick linschoten]

The correctness job refresshes the dashboard and recalculates indeed the duplicate records. but not rerun a duplicate check over the entire cmdb. What I'm searching is what script or scheduled job creates the dedup tasks and underwhat conditions.
And how to execute it over the entire exsisting base

[Sandeep90]

There are two ways IRE creates dedup tasks 

1) When you import the same data again either through SGC(service graph connectors)/ discovery or any process that uses IRE. During the identification process it identifies the duplicate records and creates the dedup task. This is preferred method as any active CIs will get deduplicated. 

2)Duplicate job runs for the records which has discovery source as empty or if discovery source is unknown and updated 1 day ago. If you mark the discovery source as empty for independent records it will go through those records and create appropriate dedup tasks.