I want to get a file identifier or hash from a file. I somehow believe I found what I need in
If I do:
TFile *f = new TFile( "myFile.root"); root  f->Hash() (unsigned long) 594636882
I get a value that seems to be the identifier. This number seems to be a 32-bits number. Will this
Hash method provide a unique identifier? What is the probability 2 different files will produce the same hash. But worst, in a database with 10,000 files (for example) what will be the probability that any pair of files will share a common hash?
It seems 32-bits depth in this hash will not be enough, since this translates to just 4x10^9 values.
So, can I rely on this hash to get a unique identifier of my file in a file database?
Or, there is a more sophisticated way to do this in ROOT?