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If a transaction rollbacks, does still version number changes?

I missed a question in UCertify, it was stating, version number changes if a transaction commits or rollbacks.
I was thinking it changes just only when transaction commits.
 
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I was thinking it changes just only when transaction commits.


You're right. It makes no sense to update the version number if the transaction rolls back. That would prevent other pending transactions to commit, although no changes have been made.
 
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