AI BriefingAre You Using JPA @Transactional Correctly
Key point
Kakao Pay analyzed how JPA's @Transactional settings affect DB performance and improved query performance by removing unnecessary transactions.
Details
While operating Kakao Pay's online payment service, they discovered an issue where set_option queries were occurring abnormally frequently. Analysis revealed that numerous autocommit and transaction-related setting queries were being called, occupying DB resources.
Through actual performance testing, they confirmed that removing @Transactional for single queries improved SELECT performance by approximately 2-3x. This shows that unnecessary transaction management can have a significant impact on DB query performance.
Accordingly, Kakao Pay applied the following @Transactional usage conventions.
- Remove @Transactional for single requests and simple queries
- Avoid using transactions in layers that may include 3rd party API calls
- Prohibit class-level configuration to prevent unintended settings
- Optimize @Transactional(readOnly=true) and propagation settings to handle the CQRS pattern
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