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Query caching using Nest.js and Typeorm
- A developer implemented a request-scoped query-cache layer in the API backend using NestJS and TypeORM, reducing duplicate database reads by around 30%.
- The project aimed to reduce redundant database queries without rewriting existing query builders and ensuring no stale data was returned.
- Challenges were faced with TypeORM's cache mechanism and cache invalidation, requiring custom solutions to maintain cache integrity.
- The implementation leveraged NestJS CLS for request-scoped cache management and custom TypeORM query cache provider to store query results.
- The custom TypeORM repository was extended to clear the cache on data writes, maintaining cache consistency.
- Testing showed a 30% reduction in database queries with the cache enabled, demonstrating the effectiveness of the implemented solution.
- The implementation required a few hundred lines of code but made a significant impact on application performance.
- The approach showcased the ability to optimize performance without extensive refactoring, facilitating focused engineering efforts on product advancement.
- The project exemplified the importance of scoping with defined rules and iterative experimentation to achieve optimal solutions.
- Results indicated the cache successfully reduced repeated queries, showcasing the effectiveness of the implemented solution.
- The project demonstrated the ability to make impactful optimizations without major architectural changes, beneficial for handling increasing service loads.
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