Why DynamoDB is better than SQL?
DynamoDB uses the primary key, and a schema is not required to be defined in advance. It also uses various data sources. All table information is accessible and we can query almost all data. SQL is rich in query processing.Since DynamoDB is a NoSQL data model, it handles less structured data more efficiently than a relational data model, which is why it's easier to address query volumes and offers high performance queries for item storage in inconsistent schemas.DynamoDB is a fully managed NoSQL database that automatically scales its resources to handle any level of traffic. It can handle petabytes of data and millions of read and write requests per second. In contrast, MySQL requires manual configuration and scaling to handle high levels of traffic and data volume.

What is a benefit to using DynamoDB over another database : As a serverless database, you only pay for what you use and DynamoDB scales to zero, has no cold starts, no version upgrades, no maintenance windows, no patching, and no downtime maintenance. DynamoDB offers a broad set of security controls and compliance standards.

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 : Disadvantages of DynamoDB

Limited Secondary Indexes: DynamoDB has limitations on the number and types of secondary indexes that can be created, which can affect query flexibility.

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.

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.

Is DynamoDB good for long term storage

The DynamoDB Standard-IA table class is ideal for use cases that require long-term storage of data that is infrequently accessed, such as application logs, old social media posts, ecommerce order history, and past gaming achievements.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.

MongoDB: Speed. DynamoDB is commonly used as an alternative to sessions in scalable apps because it is incredibly fast (faster than MongoDB). DynamoDB allows 40,000 WCUs per second (depending on the region), which means that the table can manage 40,000 writes per second for items of 1KB in size.

PostgreSQL also supports caching mechanisms, such as Materialized Views and pgpool-II, to further optimize performance. DynamoDB, on the other hand, offers low-latency performance with millisecond response times. It uses SSD storage to provide consistent performance regardless of the data size or workload.

Why is DynamoDB so fast : DynamoDB provides faster lookup times as the data is structured in a document-based format. Additionally, DynamoDB does not require a pre-defined schema that helps scale data easily.

Why is DynamoDB not popular : DynamoDB is designed as a black box with very few user-accessible controls. This approach makes it easy to use when you are just getting started. But at production scale — when edge cases rule your life — sometimes you desperately need more insight into why your data is misbehaving.

Does Netflix use DynamoDB

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.

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.