Answering your question, Sharegate does not support Content Database however you can migrate Site collections. No need to migrate any database. SharePoint is a big and complex beast and you surely recommend you to possess the Site Collection Administrator rights on your source Site Collection. I hope this helps! Ben Martin

To find a specific word or phrase on a web page on your computer open a webpage in Chrome. At the top right, click More More and then Find. Type your search term in the bar that appears in the top right. Press Enter to search the page. Matches appear highlighted in yellow. You can see where all the matches are located on a webpage using the yellow markers on the scrollbar. I hope this helps! Ben Martin