Oracle NoSQL Database Interview Questions and Answers for freshers

1. What is Oracle NoSQL Database?

   • Answer: Oracle NoSQL Database is a distributed, scalable, and highly available database designed for handling large volumes of unstructured and semi-structured data. It offers key-value, JSON document, and column-family data models, making it suitable for various applications like real-time analytics, content management, and mobile backends.

2. What are the different data models supported by Oracle NoSQL Database?

   • Answer: Oracle NoSQL Database supports three primary data models: Key-Value, JSON Document, and Column-Family.

3. Explain the Key-Value data model.

   • Answer: The Key-Value model is the simplest, storing data as key-value pairs. The key is unique and used to retrieve the associated value. This is ideal for applications needing fast read/write operations with simple data structures.

4. Explain the JSON Document data model.

   • Answer: The JSON Document model stores data as JSON documents. This is flexible and allows for semi-structured data, making it suitable for applications with evolving data schemas.

5. Explain the Column-Family data model.

   • Answer: The Column-Family model organizes data into rows and columns, similar to a traditional relational database but with more flexibility. It's efficient for storing large amounts of sparse data.

6. What is a table in Oracle NoSQL Database?

   • Answer: In Oracle NoSQL Database, a table is a logical grouping of data within a specific data model (Key-Value, JSON, or Column Family). It's the primary container for your data within a given collection.

7. What is a collection in Oracle NoSQL Database?

   • Answer: A collection is a top-level container that groups related tables. Think of it as a database within the Oracle NoSQL Database instance.

8. How does sharding work in Oracle NoSQL Database?

   • Answer: Sharding distributes data across multiple servers (nodes) to improve scalability and performance. Oracle NoSQL Database automatically handles sharding, distributing data based on the defined sharding key.

9. What is replication in Oracle NoSQL Database?

   • Answer: Replication creates multiple copies of data across different servers for high availability and fault tolerance. If one server fails, the replicated data ensures continued operation.

10. What are the benefits of using Oracle NoSQL Database?

    • Answer: Benefits include high scalability, high availability, flexibility in data modeling, and excellent performance for large datasets and high-throughput applications.

11. What are some use cases for Oracle NoSQL Database?

    • Answer: Use cases include real-time analytics, IoT data processing, session management, content management systems, catalog management, and mobile application backends.

12. How does Oracle NoSQL Database handle data consistency?

    • Answer: Oracle NoSQL Database offers different consistency levels, allowing you to choose a balance between consistency and availability. Options range from strong consistency to eventual consistency.

13. What is the difference between ACID properties and BASE properties?

    • Answer: ACID (Atomicity, Consistency, Isolation, Durability) properties are crucial in traditional relational databases, ensuring data integrity in transactions. BASE (Basically Available, Soft state, Eventually consistent) properties are more common in NoSQL databases, prioritizing availability and scalability over strong consistency.

14. Explain the concept of eventual consistency.

    • Answer: Eventual consistency means that data will be consistent across all replicas eventually, but there might be a delay. This allows for higher availability and scalability.

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