Benefits

▪ Transaction management, that we don't need to span the

transactions over the microservices.

▪ Decrease duplicate data. Since data is fully constrained, we

can easily execute complicated queries with joins.

▪ Able to follow ACID. Consistency of data and state easily

manage when process fails.

Drawbacks

▪ Microservices with shared databases can’t easily scale.

▪ Shared database will become a single point of failure.

▪ Microservices won’t be independent in terms of

development and deployment.

https://microservices.io/patterns/data/shared-database.html