SQL databases require updating the schema to store new data structures, however many DDL operations lock the tables. How to change the schema while keeping your services online? What are the alternatives?
OpenStack Foundation -
The OpenStack Foundation promotes the development, distribution and adoption of the OpenStack cloud operating system. As the independent home for OpenStack, the Foundation has already attracted more than 9,500 individual members from 100 countries and 850 different organizations, secured more than $10 million in funding and is ready to fulfill the OpenStack mission of becoming the ubiquitous cloud computing platform.