Exam (elaborations)
DM - NOSQL EXAM QUESTIONS AND 100% CORRECT ANSWERS
- Course
- Institution
DM - NOSQL EXAM QUESTIONS AND 100% CORRECT ANSWERS...
[Show more]
Content preview
DM - NOSQL EXAM QUESTIONS AND 100% CORRECT ANSWERSNoSQL vs Relational Databases - ANSWER Relational databases use
tables/rows/columns, need a predefined schema, and are vertically scalable. NoSQL
databases are schema-less, fast, horizontally scalable, and do not guarantee ACID
transactions.
Types of NoSQL Databases - ANSWER Key-value databases, document databases,
column family databases, and graph databases.
Key-Value Databases - ANSWER Simplest NoSQL databases that get and set values
associated with a unique key.
Key - ANSWER Examples: DataCampCourse:123:name, Client456, 123456789. Keys can
be any binary sequence and are unique.
Value - ANSWER Associated with a key. Examples: numbers, strings, JSON, images.
There may be size restrictions on values.
Advantages of Key-Value Databases - ANSWER Simple key-value tuple, schema-less,
fast operations, flexible data types, horizontally scalable with sharding.
Basic Operations key value - ANSWER Put: inserts or updates a key-value pair. Get:
retrieves the value for a given key. Delete: removes a key and its value.
Limitations of Key-Value Databases - ANSWER Only search by key, not suitable for
complex queries. Some key-value databases allow secondary indexing or search by
multiple keys.
Suitable Use Cases key value - ANSWER User sessions, user profiles/preferences,
shopping carts, real-time recommendations, advertising.
, Unsuitable Use Cases key value - ANSWER Finding data by its value, or processing
relevant data having complex interrelations with each other.
Redis - ANSWER An in-memory, very fast key-value database that is also used for
caching and as a message broker. Capable of flushing the data to disk.
Redis Data Structures - ANSWER Strings, lists, sets, hashes are available. Example -
SET name Ann, RPUSH my_numbers 1 2 3, HMSET user:123 name Ann surname Smith.
Popular Uses of Redis - ANSWER Caching query results, session storage, real-time
analytics, leaderboards, messaging queues.
Redis Features - ANSWER Atomic operations, transactions, Lua scripting,
asynchronous replication, supports many programming languages: Python, R, C#, Java,
JavaScript.
Redis Cloud Services - ANSWER Available via AWS Elasticache, Microsoft Azure Cache
for Redis, and Alibaba ApsaraDB.
Case Study: Editoo - ANSWER Small business using Redis to store user sessions and
cache database queries. Results: reduced downtown improved performance and future
migrations from relational databases to Redis.
NoSQL vs Relational Databases - ANSWER Relational databases use
tables/rows/columns, need a predefined schema, are vertically scalable whereas
NoSQL databases are schema-less, fast, horizontally scalable, and do not guarantee
ACID transactions.
Types of NoSQL Databases - ANSWER Key-value databases, document databases,
column family databases, and graph databases.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Easton. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75057 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now