Database Storage

Hi All, I developed a application in which I have 50-60 million records in production. Out of which 60% data is decimal and 40% is plain text. I am having database space of 10GB. As I am trying to import some more record I am getting error of disk storage full or no space left in device. I attach screenshot of error as well. Can anyone has any idea How mendix store objects? How it is possible that 10 gb database gets full by 50 million records? If you have any idea, please share your opinion. If you need more info please comment.   Thanks, Bhanu Chauhan  
1 answers

What is size of text attributes? Limited or unlimited 

Do you have indexes?