My requirement is to buy data from the web page increase within the Android Database (An easy table) and after that I'll be querying the database to transmit out notices
Whether I ought to use Async task or Service for this?
You need to use AsyncTask certainly. Service this is a large overhead.
Generally AsyncTask are utilized whenever you do small things(3-5 seconds) which is ok to exhibit a progress dialog. Services are for lengthy processing background tasks.
ya its easier to use ASync Task instead of other services its optimize your code too simple to use and work nicely too. so my suggestion for you you need to use ASync then other ahead option is your.
all the best.