Karol,

> Take into account that user can rollback or commit oryginal transaction
> before we copy all data to clone. Is this a problem or is simple to clone
> transaction in atomic way?

Given that the clone would have the details of an **active** transaction, it 
would be isolated from any other transactions just as the active transaction 
would be.

Read-committed/snapshot transactions only see data for transactions which were 
committed before the new transaction started, changes from any commit after 
that are not seen.

So, there is no issue.


Sean

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