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Dbvisit Replicate uses the same optimistic principle as Oracle applies in transactions. Oracle assumes that most transactions are committed and starts writing the transactions to disk before the commit has been issued. Dbvisit Replicate applies the same optimistic commit principle during replication which means that Dbvisit Replicate will start mining and applying the changes before the actual commit has been issued. For large transaction this can be beneficial as the transactions are not buffered, but are mined and applied as soon as they are written to the Oracle redo logs on the source database. This can reduce the amount of disk and memory required while waiting on commit and it also reduces the gap between mine and apply to a few seconds.Dbvisit Replicate supports full rollback of the transaction but will require more work to rollback the transaction. This is similar to the work required by Oracle incase of a rollback. 

Dbvisit Replicate intro and overview video