Hi @jajwalya,

Welcome to the Nintex forums and a great question for an interesting solution.

The output of a repeating section control is XML.
The first thing to do is to create a column in your list that is Multiple lines of text configured as plain text.
Your repeating section control on your form is connected to this column.

The workflow will have to loop through each row of the XML and add it to your database.
Below is a basic workflow that can achieve the solution.
I've attached the workflow, form ,and list template.
You will need to add your connection string in the Execute SQL action and enter the correct column names for your DB.
 

Thank you Very Much SimonMuntz it worked fine for me. I have tried both in sharepoint list and SQL. also i want your additional suggestion, is there any way to optmize the process time as its taking 5-8 second to run. 

and also i been trying to do same process in Nintex Site workflow. if there any refference it will be great help and also thanks is advance. 

Hi @jajwalya,

This question was posted in the Nintex for SharePoint section of the forum, which is for on-premise.
Based on your screenshot, you are using Nintex for O365, so I have moved this post to the correct section.

Nintex for O365 uses SharePoint Online’s workflow engine. To add capabilities, Nintex calls out to the Nintex infrastructure to perform some actions. The query XML action is one of those, which can add some time to the action's execution.

 

Thank you SimonMuntz for your prompt reply but we are not using Office 365 we are using on prem Sharepoint and On prem Nintex add on solution. and all server are configured as per sharepoint required architicuter.

Hi @jajwalya,

Nintex for SharePoint, also uses SharePoint’s workflow engine, so Nintex can only run as fast as your environment.
Indexing the database table where the items are being created may speed things up.