Final - NoSQL Flashcards
Q: What are the three main types of data?
A: Structured, semistructured, and unstructured.
Q: What is an example of structured data?
Relational databases.
Q: What type of data uses tags or markers for organization?
A: Semistructured data (e.g., JSON, XML).
Q: What are some examples of unstructured data?
A: Text files, audio, video, and images.
Q: In JSON syntax, how are objects and arrays represented?
A: Objects are in {}, and arrays are in [].
Q: Name three types of NoSQL data models.
A: Document databases, key-value stores, and graph databases.
Q: What type of NoSQL database is best for representing relationships between entities?
A: Graph databases.
Q: How does NoSQL differ from relational databases in terms of scalability?
A: NoSQL is horizontally scalable, while relational databases are vertically scalable.
Q: What is replication in databases?
A: The process of copying data to multiple locations for redundancy and high availability.
Q: What are the three replication strategies?
A: Leader-follower, multi-leader, and leaderless.
Q: What is sharding in databases?
A: Breaking data into smaller pieces (shards) and distributing them across multiple servers.
Q: What does the CAP theorem state?
A distributed system can only provide two of the three guarantees: consistency, availability, and partition tolerance.
Q: Which part of the CAP theorem is almost always required?
A: Partition tolerance.
