First of all, if you are convicted, and maybe even if you aren't, the DBS might consider barring you, although common assault is not a "relevant offence", so unless it's for something that happened while you were working with vulnerable groups, barring won't be an option. They would offer you the chance to make representations, and Unlock can offer you information and advice about that
. The second point is that ex-offenders aren't necessarily vulnerable people in the strict sense of DBS barring. Unless your job is limited to regulated activity
with vulnerable groups, then barring would not be an issue.
As Chris Stacey said: Although its not formally part of the sentence that is handed down in court, the criminal record that someone comes away with effectively becomes a second sentence, which can have a long-lasting, if not lifelong, impact.