This video explains the 7 Database Patterns for Microservices.
00:55 - Database per Service
07:29 - Shared database
11:20 - Saga
19:00 - API Composition
21:08 - CQRS
24:36 - Domain event
26:37 - Event sourcing
To learn more about how to build microservices in Spring, see links below.

Microservices Step by Step Procedure here: https://bit.ly/2I6gCDD
Microservices Source Codes here: https://bit.ly/2It8fkp

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1. Introduction to Microservices    • Microservices Tutorial 1.  Introducti...  
2. The Microservices We Build    • 2  The Microservices We'll Build  
3. Create the Applications in Spring Initializr    • 3  Create the Services Using Spring I...  
4. Import the projects into Sprint Tool Suite    • 4  Import the Projects in Spring Tool...  
5. Set port and application name in application.properties file    • 5  Set port and application name in a...  
6. Create the Admissions Controller and Patient class    • 6  Create the Admissions Controller a...  
7. Add RequestMappings    • 7  Add RequestMappings  
8. Write getPatientById method    • 8  Write the GetPatientById Method  
9. Build the Hr Service    • 9 - Build the HR Service  
10. Build the Pathology Service    • 10  Build the Pathology Service  
11. Test all the three Service    • 11 - Test the Three Services  
12. Using RestTemplate Bean    • 12 - Using RestTemplate and Bean to M...  
13. Making REST Calls With RestTemplate    • 13  Making REST Calls with RestTemplate  
14. List of Objects vs ObjectList Object    • 14  List of Object vs ObjectList  
15. Class Duplication in Microservices    • 15  Class Duplication in Microservices  
16. Test the Services Interaction    • 16  Test the Services Interaction  
17. Call pathology service from admissions service    • 17  Call the Pathology Service from t...  
18. Debugging Skills in Microservices    • 18  Improve Your Debugging Skills in ...  
19. What is Eureka    • 19 - What is Service Discovery(Eureka...  
20. Building the Eureka Server    • 20  Building the Eureka Server  
21. Create Eureka Clients    • 21  Creating Eureka Clients  
22. Publish Clients to the Eureka Server    • 22  Publish Clients to Eureka Server  
23. Consuming Microservices    • 23  Consuming Microservices  
24. Summary and Thank You    • 24  Summary and Thank You  

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Microservices Tutorial Step by Step Procedure here: https://bit.ly/2I6gCDD
Microservices Tutorial Source Codes here: https://bit.ly/2It8fkp
How to Build Microservices in Java Using Spring Tool Suite and Eureka