I've been working on this MAF application currently. i had noticed that my application file size is getting bigger compared to several example codes that i've downloaded(approximate less than 5 mb). At first, i tried to upload the file into the server, only then i've noticed the file were to big and lead me this .data folder which held roughly 45MB in size. Inside of its sub-directory folder there is a folder named 00000000 which consist bunches of jdb files (00000000.jdb,0000001a.jdb and so on).

I just need to know whether these several jdb's folder were created when i had deployed the application many times before? If so, could i delete these jdb's files to reduce the size capacity of my application and will it effect the application that im currently developing?
Thanks in advance,
Learner90@