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@Anchal gupta , From your description, It seems we want to migrate Operations Manager databases from one SQL cluster to another. If there's any misunderstanding, please let us know.
Based on my research, I find an article list the steps to do this. We can refer to it:
https://www.azure365pro.com/migrating-operations-manager-2012-r2-databases-to-new-database-server/
Note: Non-microsoft link, just for the reference.
Meanwhile, for SCOM 2012 R2, if we want to migrate to the latest version, we can firstly migrate to SCOM 2016 then to 2019. Here is a blog from Kevin for the reference:
https://kevinholman.com/2020/05/25/upgrade-from-scom-2012r2-to-scom-2016-checklist/
Note: Non-microsoft link, just for the reference.
Hope it can help.
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