I am developing an Google maps android application in which I want to use database in cloud for saving usernames, passwords, GPS Locations etc. Can any option to achieve this with free of cost ? If there are any examples, posts, or tutorials?
PostgreSQL. A unique relational database, PostgreSQL is the best database for Android and iOS apps. Developers can customize this database as they want; that's why it's the most preferred mobile app database.
Data Modelling is very helpful if your app contains features like search queries, reporting, location-based features, etc. Such apps require multiple databases to manage different types of data. For example, Uber uses MySQL, MongoDB and lot of other databases.
Now there are a lot of cloud providers , providing solutions like MBaaS (Mobile Backend as a Service). Some only give access to cloud database, some will do the user management for you, some let you place code around cloud database and there are facilities of access control, push notifications, analytics, integrated image and file hosting etc.
Here are some providers which have a "free-tier" (may change in future):
Open source solutions:
As Wingman said, Google App Engine is a great solution for your scenario.
You can get some information about GAE+Android here: https://developers.google.com/eclipse/docs/appengine_connected_android
And from this Google IO 2012 session: http://www.youtube.com/watch?v=NU_wNR_UUn4
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