Readyset | Drop-in SQL Caching for PostgreSQL and MySQL
Hacker News
February 9, 2026
AI-Generated Deep Dive Summary
Readyset, a drop-in SQL caching solution for PostgreSQL and MySQL, offers a game-changing approach to scaling database deployments by up to 100x without altering applications or databases. Its integration seamlessly enhances performance while maintaining compatibility with existing systems, making it an attractive option for developers seeking efficient scalability solutions.
MySQL 9.6 introduces a significant update by moving foreign key enforcement from the InnoDB storage engine to the SQL layer, addressing long-standing issues with cascading operations and their visibility in the binary log. Historically, foreign key cascades like ON DELETE CASCADE were handled internally by InnoDB, leaving the SQL layer—and thus tools like CDC pipelines—unaware of these changes. This limitation caused problems for replication setups using different storage engines or requiring comprehensive audit trails.
The new architecture ensures that cascading operations are now visible in the binary log, enabling tools like Debezium and Readyset to capture these events accurately. This change resolves issues with replication consistency, especially in scenarios involving non-InnoDB storage engines or mixed engine setups. It also enhances auditing capabilities, ensuring a complete record of all data modifications.
For businesses relying on MySQL for critical applications, this update improves replication reliability and simplifies database management across distributed systems. The enhanced visibility into cascading operations supports more robust CDC pipelines and ensures that all related changes are recorded and replicated accurately.
This breakthrough in MySQL 9.6 underscores the importance of continuous innovation in database architecture. By addressing fundamental limitations in foreign key handling, it not only enhances scalability but also strengthens the reliability of replication and audit systems. For tech enthusiasts and businesses alike, this update represents a significant step forward in achieving more scalable, efficient, and reliable database deployments
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Originally published on Hacker News on 2/9/2026