>Hi
>
>I've been setting up a scanning and signature app on some mobile phone/scanners and I'm looking at storing scans when they have no signal in an offline SQL DB.
>
>Anyone tell me how long an offline DB persists and "where " is it.

For simple stuff you might want to consider using localstorage rather than a Sql option :

http://www.w3.org/TR/webstorage/#the-localstorage-attribute