Microservices Data Management Strategies Questions and Answers

Question 1

An e-commerce platform uses a choreography-based Saga pattern to process new orders.
The 'Order' service emits an 'OrderCreated' event.
The 'Inventory' service listens for this event to reserve stock, and the 'Payment' service listens to it to process payment.
What is a primary disadvantage of this choreographed approach compared to an orchestrated one?

Accepted Answer

The overall business transaction flow is not explicitly defined in one place, making it harder to monitor and debug.

Answer

It introduces a single point of failure through a central coordinator.

Answer

It leads to tighter coupling between the services because they must directly call each other.

Answer

It cannot support compensating transactions to roll back the process in case of a failure.

Question 2

A financial services application requires that when a user's address is updated, the change is immediately and consistently reflected across the 'Customer Profile', 'Billing', and 'Shipping' services. The business cannot tolerate any temporary inconsistencies. Which data consistency model is most appropriate for this requirement?

Accepted Answer

Strong Consistency

Answer

Eventual Consistency

Answer

Causal Consistency

Answer

Read-Your-Writes Consistency

Question 3

A team is building a microservices-based application where different services have vastly different data storage needs. The 'Product Catalog' service deals with semi-structured data and requires flexible schema, while the 'User Authentication' service manages relational data with strict transactional integrity. Which data management strategy allows teams to select the most appropriate database technology for their specific service?

Accepted Answer

Polyglot Persistence

Answer

Database Sharding

Answer

Data Lakehouse

Answer

Centralized Monolithic Database

Question 4

An organization is migrating a legacy monolithic application to microservices. They need a way to synchronize data from the monolith's database to the new microservices' databases in near real-time without modifying the monolith's application code. Which pattern is best suited for this purpose?

Accepted Answer

Change Data Capture (CDC)

Answer

API Composition

Answer

Strangler Fig Pattern

Answer

Transactional Outbox

Question 5

In a microservices architecture, what is the primary motivation for enforcing the principle of 'Data Ownership', where each service is solely responsible for its own data store?

Accepted Answer

To ensure services remain loosely coupled and can be developed, deployed, and scaled independently.

Answer

To simplify database administration by having a single DBA manage all data.

Answer

To guarantee strong, immediate consistency across the entire system for all transactions.

Answer

To reduce data storage costs by consolidating all data into a single, large database instance.

Question 6

A social media application is designed with an eventual consistency model. When a user updates their profile picture, the change might take a few seconds to propagate to all replicas and be visible to their friends. Which of the following is the primary trade-off for accepting this temporary inconsistency?

Accepted Answer

Higher availability and improved performance during network partitions.

Answer

Reduced data integrity and higher risk of data corruption.

Answer

Increased query latency and slower read performance.

Answer

Simplified transaction management across distributed services.