What type of database is quickbooks is bcoz we are planning to midgrate from quickbooks to tally. The tally technician wants to know what type of database does QB using ?

QB Online is different with QB Desktop. You must export the data out to *.csv files.

https://get.transactionpro.com/qbo

Thanks for reaching out to the Community, @kalyan-n-diligen. 

Allow me to chime in add information about QB database.

I agree with Fiat - Lux ASIA. QBO is cloud base subscription. There isn't storage on attachments and other selected data. Thus, when migrating from QuickBooks Online, you can use .csv files when exporting data. 

You can also checkout this article to learn how to export and use the reports and list that you have in the program to help you review all transactions exported: Export data, reports, lists, and more from QuickBooks Online.

Click the reply button below for follow-up questions about it. I'm always here to help. Have a nice week!