The main takeaway from this is that there are no silver bullets Anytime you

• The main takeaway from this is that there are no silver bullets. Anytime you deal with databases, there are going to be tradeoffs that you have to make. CQRS- Command Query Responsibility Segregation. 3/14/2020 CSI ZG524 Intro to Devops 58

BITS Pilani, Pilani Campus • Another technique for Zero downtime deployment strategies • In a rolling deployment, an application’s new version gradually replaces the old one. The actual deployment happens over a period of time. During that time, new and old versions will coexist without affecting functionality or user experience. This process makes it easier to roll back any new component incompatible with the old components. Rolling Deployment/Upgrade 3/14/2020 CSI ZG524 Intro to Devops 59 • The old version is shown in blue and the new version is shown in green across each server in the cluster . • Issues: • Backward compatibility (Apps to support) • Session Persistence(load balancer to support)