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Impact on OLTP MSSQL database


I am new to Qlik and I went through the Qlik documentation on Qlik replicate. I need to connect to Microsoft SQL Database and replicate data to a different destination. However I need some clarity on following.

1. I understood that Qlick will read the transaction log file to retrieve the data/changes. Is it correct? 

2. If it is retrieving data from transaction log, how will be the performance impact on OLTP database?

3. Is there a way to read data/changes from the backup of transaction log?

Thank you.


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