SQL Fiddle VS Datomic

• Ease of Use
  SQL Fiddle provides a user-friendly interface for running SQL queries and experimenting with different database structures without needing to set up a local or remote database environment.
• Free Access
  Users can access SQL Fiddle for free, making it a cost-effective solution for quick testing and learning purposes without requiring any paid subscriptions.
• Multiple Database Support
  SQL Fiddle supports multiple database systems, such as MySQL, PostgreSQL, and SQLite, allowing users to test queries in various environments.
• Educational Tool
  SQL Fiddle serves as a great educational resource for learners and educators to demonstrate and understand SQL concepts and database operations in real-time.
• Collaboration
  It allows users to easily share database schemas and SQL queries with others through generated URLs, facilitating collaboration and feedback.

Possible disadvantages

• Performance Limitations
  SQL Fiddle may exhibit performance limitations, particularly with complex queries or large datasets, as it operates on shared, limited infrastructure.
• Dependence on Internet Access
  As a web-based tool, SQL Fiddle requires an internet connection to access its features, which may not be suitable for offline work or conditions with limited connectivity.
• No Persistence
  Data and schemas on SQL Fiddle are not persistent, meaning they can be lost over time or due to maintenance, making it unreliable for long-term storage or ongoing project work.
• Limited Functionality
  SQL Fiddle may not support the full feature set or latest features of all database systems, potentially limiting its use for testing advanced or system-specific queries.
• Deprecated or Unavailable Features
  Sometimes, features on SQL Fiddle may be deprecated or become unavailable, affecting usability and the ability to test certain queries effectively.

• Immutability
  Datomic employs an append-only data model where data is never overwritten but instead appended, ensuring historical data is always available and providing strong consistency.
• Time Travel Queries
  Datomic allows you to query the database as of any point in time, facilitating auditing and debugging by allowing easy access to historical data states.
• Rich Data Model
  Supports complex data types like maps and sets directly within its schema, providing a flexible way to represent data.
• ACID Transactions
  Datomic supports fully ACID-compliant transactions, ensuring reliable and predictable database operations.
• Scalability
  Separates storage and compute, allowing for horizontal scaling of read operations, making it suitable for handling large datasets.
• Query Flexibility
  Offers a powerful query language that supports recursive queries, making it suitable for complex data retrieval needs.

Possible disadvantages

• Complexity
  The architecture of Datomic can be complex to understand and implement, particularly for teams unfamiliar with its design principles.
• Cost
  Can be expensive to operate, especially in a cloud environment, where costs increase with the amount of data stored and the compute resources required.
• Limited Write Throughput
  Due to its append-only design, Datomic can have limited write throughput, which may not be suitable for applications with heavy write requirements.
• Closed Source
  Datomic is a proprietary database system, which may not appeal to organizations that prefer open-source solutions.
• Learning Curve
  Requires a learning curve as its conceptual model and query language are different from traditional databases, potentially requiring additional training.
• Dependency on AWS
  Relying on AWS ecosystem for the storage backend can limit choices for deployment environments, impacting flexibility.

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KotlinConf 2018 - Datomic: The Most Innovative DB You've Never Heard Of by August Lilleaas

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Tracking Datomic since Mar 2021.