Podcast
Questions and Answers
In DynamoDB, which characteristic of primary keys is crucial for optimizing performance and scalability?
In DynamoDB, which characteristic of primary keys is crucial for optimizing performance and scalability?
- Primary keys must be encrypted to ensure data security.
- Primary keys should be short and concise to minimize storage space.
- Primary keys should be auto-incrementing integers for easy management.
- Primary keys need to be unique and designed to distribute data evenly across partitions. (correct)
How does DynamoDB achieve high availability and durability?
How does DynamoDB achieve high availability and durability?
- By using a single, powerful server to handle all requests.
- By replicating data across availability zones (AZs) and distributing it across multiple nodes. (correct)
- By relying on manual backups to restore data in case of failures.
- By compressing data to reduce the risk of data corruption.
What is a key difference between DynamoDB and a traditional relational database (RDBMS) in terms of schema management?
What is a key difference between DynamoDB and a traditional relational database (RDBMS) in terms of schema management?
- DynamoDB only supports numeric data types, while RDBMS supports a wide range of data types.
- DynamoDB requires a strict, predefined schema for all tables, similar to RDBMS.
- DynamoDB enforces foreign key constraints to maintain data integrity, which is not a feature of RDBMS.
- DynamoDB is schemaless, allowing each item in a table to have different attributes without a fixed structure, unlike RDBMS. (correct)
Consider a scenario where you need to store user profile data, including a list of the user's favorite movie genres (e.g., 'Adventure', 'Fantasy'). How would you best represent the 'Genres' attribute in DynamoDB?
Consider a scenario where you need to store user profile data, including a list of the user's favorite movie genres (e.g., 'Adventure', 'Fantasy'). How would you best represent the 'Genres' attribute in DynamoDB?
Which statement accurately describes DynamoDB's data model?
Which statement accurately describes DynamoDB's data model?
Flashcards
What is DynamoDB?
What is DynamoDB?
A serverless, non-relational database that doesn't require a predefined schema and scales horizontally.
Relational Database Characteristics
Relational Database Characteristics
Structured data, predefined schema, vertical scaling, complex SQL queries, optimized for complex queries (e.g., reporting).
NoSQL Database Characteristics
NoSQL Database Characteristics
Schemaless, horizontal scaling, varying query methods, optimized for performance and flexibility (e.g., big data, real-time analytics).
DynamoDB Components
DynamoDB Components
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Primary Key in DynamoDB
Primary Key in DynamoDB
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Study Notes
- DynamoDB is a serverless NoSQL database.
- NoSQL databases are non-relational.
Relational DB vs NoSQL
- Relational Databases use structured data in tables compared to NoSQL which uses structured, semi-structured, and unstructured data.
- Relational Databases require a predefined schema against NoSQL's schemaless nature.
- Relational Databases scale vertically, while NoSQL scales horizontally.
- Relational Databases use SQL queries, whereas NoSQL uses varying query methods.
- Relational Databases are optimized for complex queries; NoSQL is optimized for performance, large volume, and flexibility.
- Relational Databases are suited for reporting, while NoSQL fits big data and real-time analytics.
- DynamoDB supports both key-value and document data models.
- It is a fully managed distributed database.
- DynamoDB performs well under high traffic and workloads.
- High availability and durability are achieved through distribution and Availability Zone (AZ) replication.
- Supports encryption at rest.
DynamoDB Components
- Tables: Collections of data.
- Items: Individual records in a table, with a maximum size of 400 KB.
- Attributes: Properties of a table.
- All tables in DynamoDB must have a primary key.
- Each item has a unique identifier and must be scalable, for example, user1, user2, user3.
- Tables are schemaless.
- Nested attributes are allowed, such as "Genres: ['Adventure','Fantasy']".
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Description
Explore DynamoDB, a serverless NoSQL database, and its advantages over relational databases. Discover its flexible data models and scalability. Learn how it ensures high availability and durability.
