Database Systems: OLTP vs. OLAP and NoSQL

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Questions and Answers

What does NoSQL stand for in the context of databases?

Non-SQL Database

Non-Schema Query Language

Next-Generation SQL

Not Only SQL (correct)

What is the main difference between ACID and BASE transactions?

ACID transactions are scalable, while BASE transactions are not.

BASE transactions prioritize scalability and availability over immediate consistency, unlike ACID transactions. (correct)

ACID transactions are easy to replicate, while BASE transactions are not.

BASE transactions ensure immediate consistency, while ACID transactions do not.

What is the meaning of the 'Soft state' characteristic in BASE transactions?

Data consistency is guaranteed at all times.

Periodic updates maintain data correctness without guaranteed consistency at all times. (correct)

It ensures immediate data consistency without any trade-offs.

It allows concurrent access to data without any locks or blocking.

What are the main characteristics of NoSQL databases according to www.nosql-database.org?

Non-relational, distributed, open source, and horizontally scalable Signup and view all the answers

In the context of transactions, what is the meaning of 'Eventually Consistent'?

Updates to data eventually propagate to all nodes. Signup and view all the answers

What is the main difference between OLTP and OLAP systems?

OLTP systems provide source data to data warehouses, whereas OLAP systems help to analyze it Signup and view all the answers

What is the main focus of NoSQL databases?

Handling large-scale distributed data and non-relational models Signup and view all the answers

Which characteristic is associated with the physical layer abstraction in SQL databases?

Applications specify what, not how Signup and view all the answers

What type of operations are performed by Data Manipulation Language (DML) in SQL databases?

Data manipulation with Select, Insert, Update, & Delete statements Signup and view all the answers

What is a key feature of NoSQL databases compared to SQL databases?

High scalability and non-relational data models Signup and view all the answers

What is the main focus of OLTP systems?

Source data provision to data warehouses Signup and view all the answers

Which characteristic is associated with NoSQL databases?

Physical layer abstraction Signup and view all the answers

What type of operations are performed by Data Manipulation Language (DML) in SQL databases?

Data manipulation with select, insert, update, & delete statements Signup and view all the answers

What is a key feature of SQL databases compared to NoSQL databases?

Data stored in columns and tables Signup and view all the answers

What does OLAP stand for in the context of IT systems?

Online Analytical Processing Signup and view all the answers

What does NoSQL stand for in the context of databases?

Not Only SQL Signup and view all the answers

What is the main focus of NoSQL databases?

Addressing some points: non-relational, distributed, opensource, and horizontal scalable Signup and view all the answers

Which characteristic is associated with the physical layer abstraction in SQL databases?

Create Table (Column1 Datatype1, Column2 Datatype 2, …) Signup and view all the answers

What type of operations are performed by Data Manipulation Language (DML) in SQL databases?

Insert, Update, Delete Signup and view all the answers

What is the meaning of the 'Soft state' characteristic in BASE transactions?

Correctness of data not guaranteed at all times, but maintained through periodic updates Signup and view all the answers

In the context of transactions, what is the meaning of 'Eventually Consistent'?

Property of distributed systems where updates to data eventually propagate to all nodes Signup and view all the answers

What are the main characteristics of NoSQL databases according to www.nosql-database.org?

Being schema-free, easy replication support, simple API, eventually consistent / BASE (not ACID), a huge data amount, and more Signup and view all the answers

What is a key feature of NoSQL databases compared to SQL databases?

'Basically Available, Soft state, Eventually Consistent' (BASE) transactions Signup and view all the answers

What is the main difference between ACID and BASE transactions?

'Basically Available, Soft state, Eventually Consistent' vs 'Atomic, Consistent, Isolated, Durable' Signup and view all the answers

What is the meaning of the 'Soft state' characteristic in BASE transactions?

Correctness of data not guaranteed at all times but maintained through periodic updates Signup and view all the answers

What type of operations are performed by Data Manipulation Language (DML) in SQL databases?

Insert, Update, Delete Signup and view all the answers

Study Notes

Database Basics

NoSQL stands for Not Only SQL in the context of databases.
OLAP stands for Online Analytical Processing in the context of IT systems.

Transaction Characteristics

ACID transactions are characterized by Atomicity, Consistency, Isolation, and Durability.
BASE transactions are characterized by Basic Availability, Soft-state, and Eventual Consistency.
The main difference between ACID and BASE transactions is that ACID transactions are more robust and reliable, while BASE transactions are more flexible and scalable.

NoSQL Database Characteristics

According to www.nosql-database.org, the main characteristics of NoSQL databases are:
- Schema-free
- Horizontal scaling
- High performance
- Flexible data model
- Distributive architecture
- Support for big data and real-time web applications
In NoSQL databases, the 'Soft state' characteristic means that the state of the system may not be consistent at all times, and it may take some time to reach consistency.
'Eventually Consistent' means that the system will eventually reach a consistent state, but it may not be immediately consistent.