Active Directory, Windows 2012 R2 -- researching USN changes ?

I did a "repadmin /showutdvec DChostName dc=........" on one of my 3 replicated DCs, waited 24 hours, repeated, and see that all of my DC USN numbers went up by 3,000+ during that period

 1. How can I find out what 3,000+ transactions have happened ?

 2. What are ALL the type of transactions (i.e. user changing password, someone changing security rights on folder, etc) that get tracked via USN ?
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Cliff GaliherCommented:
1) Domain controllers keep transactions in the edb.log files, though they aren't really meant to be human readable.  They are useful in advanced troubleshooting, but even then are better parsed with tools designed for the task.  Some are only internal to Microsoft on top of it all.  In short, don't bother.

2) Any change to AD can cause a USN increase.  AD has tracked last logon time for quite some time, as well as replication health, etc. So even a system doing nothing will increase USN.  This is perfectly normal and is not an issue.

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Shaun VermaakTechnical SpecialistCommented:
What led you to run "repadmin /showutdvec DChostName dc=........"? Do you have an issue you are throubleshooting
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