Dumpstate delete? What do they delete?

[AC Question]

dumpstate delete? what do they delete?

I've been having problems with my files (insufficient storage space) even though I didn't add anything or download anything to my sd card. and I found out that the solution is to call *#9900# and tap "delete dumpstate/logcat" I just wanted to know what do they delete? because I don't want any of my files or chat histories to be gone