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I write an android app.

The user sends the server its location and get places relevant to him.

He then can up-vote or down-vote any offer.

I wonder if I should write to local DB and when?

I connect via fb only.

As I see it, there is nothing i should save in local DB

performance wize it's better to save and prosess anything at the server side.

And also in a local memory (per application session).

Any idea what should I save in local DB to be more efficient and to last more than one session (and shouldn't be stored in the server only) ?

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Saving of info locally depends on your requirement of app. Are you always connected to server and fetching the offers for user to vote up or down, or just getting a connection to server when user launches the app? –  Sandeep Pareek Mar 19 at 14:49
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