Hi Vivek,

Please check below document,

https://success.outsystems.com/Documentation/10/Extensibility_and_Integration/Integrate_with_an_External_Database?_gl=1*gubr9z*_ga*NDMxNTk1ODI1LjE2NTU4MDc2OTM.*_ga_ZD4DTMHWR2*MTY3Mzg3MDk2OC4zNzIuMS4xNjczODgxODU5LjYwLjAuMA..

https://www.outsystems.com/forums/discussion/41147/data-migration-to-outsystems-cloud-from-a-on-premise-database/

and you can use forge component also,

https://www.outsystems.com/forge/component-overview/2812/infosistema-dmm

In addition you can watch below video,

https://www.youtube.com/watch?v=do0lUCKPWmU

Hope it helps you.

Thanks,

Ajit Kurane.