LB's can also be used for HA but it is not default setup.
Veritas Scalable System Architecture
Database Clusters with HA & Scalibility
How to choose your Database for HA and Scalability? This talk from Neha is an excellent overview of what goes in choosing a appropriate database for your application. One thing she said that struck me is "Don't start with Scalibility". She also talks about how NoSQL is not the solution for all your High Scalibility Problems.
Here's her talk :
A related article based on Neha's talk is from Pinetrust :
Database Sharding with Django
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