Antwort Is DynamoDB better than PostgreSQL? Weitere Antworten – Why use DynamoDB instead of PostgreSQL

Is DynamoDB better than PostgreSQL?
PostgreSQL utilizes a relational data model, organizing data into tables with predefined schemas and supporting complex data types and relationships. In contrast, DynamoDB employs a key-value data model, storing data as key-value pairs without a fixed schema, offering flexibility for unstructured data storage.Conclusion. As a non-relational database, DynamoDB is a reliable system that helps small, medium and large enterprises scale their applications. It comes with options to backup, restore and secure data, and is great for both mobile and web apps.Serverless applications—Amazon DynamoDB provides a durable backend for storing data at any scale and has become the de facto database for powering Web and mobile backends for e-commerce/retail, education, and media verticals.

Why is DynamoDB so popular : We chose DynamoDB for its fast performance, high durability, and serverless scaling. Some of our DynamoDB workloads store historical data and are used less frequently than others.

When should you not use DynamoDB

When not to use DynamoDB: When multi-item or cross table transactions are required. When complex queries and joins are required.

What are the disadvantages of DynamoDB :

  • Weak querying model, querying data is extremely limited.
  • Lack of server-side scripts.
  • Table Joins – Joins are impossible, Triggerless.
  • Hard to predict cost when that usage might spike, it's not unheard of, to get caught with unexpected costs.
  • Provisioned throughput and batch jobs don't work well together.

When not to use DynamoDB:

  1. When multi-item or cross table transactions are required.
  2. When complex queries and joins are required.
  3. When real-time analytics on historic data is required.


DynamoDB will work well in a lot of various scenarios, but you need to be aware of the downsides. Primarily, that it doesn't allow for traditional SQL queries and access patterns, which means for things like free-text search or ad-hoc queries, you'll likely need to export data to a different system.

When should I not use DynamoDB

When not to use DynamoDB: When multi-item or cross table transactions are required. When complex queries and joins are required.To provide a personalized viewing experience, Netflix relies on Amazon DynamoDB for high-performance database management. DynamoDB's NoSQL database service enables rapid and flexible data retrieval, allowing Netflix to tailor content recommendations to individual user preferences.DynamoDB Streams data retention is 24 hours. If you need longer retention, Kinesis Data Streams provides 7 days extended data retention and up to 365 days long-term data retention. DynamoDB Streams allows up to two processes to simultaneously read from a stream shard.

DynamoDB, on the other hand, uses a shift-left model of scalability. It forces you to think about designing your data model up front in a way that will scale. With DynamoDB, there's no black box as to how your database will scale: How fast will my query return when the scale is 100X as large

Is Amazon DynamoDB always free : Does DynamoDB offer a free tier Yes, the free tier for DynamoDB provides 25GB of storage, along with 25 provisioned Write and 25 provisioned Read Capacity Units (WCU, RCU) which is enough to handle 200M requests per month.

What is DynamoDB not good for : Unable to Use Table Joins. DynamoDB has limited options for querying the data within its tables and restricts the complexity of the queries. The database service makes it impossible to query information from multiple tables as it does not support table joins.