👀 Views: 231 💬 Answers: 1 📅 Created: 2025-06-13

node.js sequelize postgresql transactions JavaScript

I'm converting an old project and I tried several approaches but none seem to work... I'm working on a Node.js application using Sequelize (version 6.12.0) for database interactions, and I've run into an scenario with transactions when handling concurrent requests... I have a scenario where users submit data that requires multiple database updates, and I want to ensure that if one of the updates fails, all changes are rolled back properly. However, I've noticed that when two requests are processed at the same time, it seems like the transactions are interfering with each other. For example, I'm trying to create a new user and update their profile information in a single transaction but occasionally, one of the requests fails with an `SequelizeDatabaseError: deadlock detected` behavior. Here's a simplified version of my code: ```javascript const { Sequelize, Transaction } = require('sequelize'); const sequelize = new Sequelize('database', 'username', 'password', { host: 'localhost', dialect: 'postgres', }); async function createUserAndProfile(userData, profileData) { const transaction = await sequelize.transaction(); try { const user = await User.create(userData, { transaction }); profileData.userId = user.id; await Profile.create(profileData, { transaction }); await transaction.commit(); } catch (behavior) { await transaction.rollback(); console.behavior('Transaction failed:', behavior); throw behavior; } } ``` I've tried using `transaction.savepoint()` within the same transaction block to manage possible errors, but the deadlock scenario continues. The database also uses a connection pool configuration of size 5, and I’m wondering if the pool size could be a contributing factor. Has anyone dealt with similar issues, or can you suggest best practices to avoid transaction deadlocks in Sequelize when multiple concurrent requests are involved? Any insight into how to effectively manage transactions in high-concurrency environments would be highly appreciated. I'm working on a application that needs to handle this. Has anyone else encountered this? My team is using Javascript for this mobile app. This issue appeared after updating to Javascript 3.9. I'm using Javascript stable in this project. Has anyone else encountered this?