Assuming that you have a situation where you have two Servers in a SharePoint Firm. One is for Database and another one is for Web Front-end Server. And your web front end server crashed or you want to create a new application using an existing content DB.
Before using the existing Content Database it must be ensured that the SharePoint Firm Version in your SharePoint Central admin and in the Content DB is same, otherwise SharePoint will not allow you to use the existing content DB.
How to Check Firm and DB Version
1. Go to SharePoint Central Admin –> Operation –> Servers in Firm link to check Firm Version
2. From you SharePoint DB Server open query analyzer and check the version name using following query
Use [YOUR CONTENT DB NAME]
Select * from Versions
What to do if Firm Version and DB Version is not same
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