Well, I rooted my s4 mini GT-I9195L 4.2.2 with the safe root "[ROOT] Saferoot: Root for VRUEMJ7, MK2, and Android 4.3" http://forum.xda-developers.com/show....php?t=2565758.
I want to thank to the owner of the post and say that it worked for me.
I knew that this method disables KNOX and no sets the "Knox Warranty Void" flag. I entered in download mode after the root process and it showed Knox Warranty Void 0x0.
In conclusion i want to know if i need to uninstall or delete all the files of KNOX to prevent some issue in the future.
Thanks for your answers.