NoSQL Design Principles Quiz and Flashcards

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Questions and Answers

What is a common approach in NoSQL databases when retrieving data?

Using several queries to get the desired data (correct)

Only doing one query regardless of the data needed

Retrieving all the data with one query

Using complex nested queries for data retrieval

In NoSQL databases, what is a consideration for storing foreign values?

Storing foreign values as separate documents

Storing foreign values separately in a different database

Storing only foreign keys for efficiency

Storing actual foreign values along with the model's data (correct)

In document databases like MongoDB, where are comments often stored in relation to blog posts?

Within the blog post document (correct)

In a separate collection linked by a foreign key

As separate documents linked by a unique identifier

In a completely separate database

How is a database marked as supporting ACID properties or join operations?

If the documentation for the database makes that claim Signup and view all the answers

What does it mean if a database supports ACID properties and join operations?

It claims to support them, but not necessarily fully similar to most SQL databases Signup and view all the answers

What approach works better when reads are much more common than writes in a NoSQL database?

'Caching, replication and non-normalized data' approach Signup and view all the answers

What is the primary consideration for storing foreign values in NoSQL databases?

Easy access to the foreign value without requiring another lookup Signup and view all the answers

What does NoSQL stand for originally?

Non-SQL Signup and view all the answers

What is a characteristic of retrieving data from document databases like MongoDB?

One might choose to store related data within fewer collections for easier retrieval Signup and view all the answers

What is a key feature of NoSQL databases?

Rapid scalability for unstructured data sets Signup and view all the answers

Why was the term 'NoSQL' coined in the early 21st century?

Triggered by the needs of Web 2.0 companies Signup and view all the answers

What differentiates the data structures used by NoSQL databases from those used in relational databases?

They are different types such as key-value pair, wide column, graph, or document Signup and view all the answers

What do most NoSQL stores prioritize over consistency?

Availability, partition tolerance, and speed Signup and view all the answers

What are some barriers to NoSQL adoption mentioned in the text?

Low-level query languages and lack of standardized interfaces Signup and view all the answers

What is a characteristic of NoSQL databases' transactions?

They generally lack true ACID transactions but offer eventual consistency Signup and view all the answers

When did the general concept of 'NoSQL' emerge?

Around 2009 with the rise of non-relational, distributed data stores Signup and view all the answers

How are key-value stores defined in the text?

Using the associative array as their fundamental data model and supporting various consistency models Signup and view all the answers

'Graph databases' are designed for representing what type of data?

'Data represented as a graph with finite relations' Signup and view all the answers

How are document stores described in the text?

Encapsulating data in standard formats and using unique keys to address documents in the database. Signup and view all the answers

What is a common evaluation criteria for NoSQL databases mentioned in the text?

Throughput and commonly benchmarked using the YCSB benchmark. Signup and view all the answers

What is a challenge mentioned for both NoSQL and relational databases in distributed transaction processing?

Data consistency Signup and view all the answers

What is mentioned as helping prevent potential data loss in some NoSQL systems?

'Write-ahead logging' Signup and view all the answers

Study Notes

Overview of NoSQL Databases

NoSQL databases are chosen based on the problem they solve and are seen as more flexible than relational databases.
Most NoSQL stores prioritize availability, partition tolerance, and speed over consistency.
Barriers to NoSQL adoption include low-level query languages, lack of standardized interfaces, and existing investments in relational databases.
NoSQL databases generally lack true ACID transactions but offer eventual consistency.
Some NoSQL systems may experience data loss, but concepts like write-ahead logging help prevent it.
Data consistency is a challenge for both NoSQL and relational databases in distributed transaction processing.
The term "NoSQL" was coined in 1998, but the general concept emerged around 2009 with the rise of non-relational, distributed data stores.
NoSQL databases can be classified into types like key-value stores, document stores, and graph databases.
Key-value stores use the associative array as their fundamental data model and support various consistency models.
Document stores encapsulate data in standard formats and use unique keys to address documents in the database.
Graph databases are designed for data represented as a graph with finite relations, such as social relations or network topologies.
NoSQL databases are evaluated based on throughput and commonly benchmarked using the YCSB benchmark.

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Description

Test your knowledge of NoSQL databases with this quiz that covers the principles and features of non-relational database design, including rapid scalability and schema-less structure.