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How to fix N+1 queries in Prisma + NestJS under high load?

March 18, 2026

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Profile with Prisma's queryRaw logging or Studio; batch via findMany({ where: { id: { in: ids } } }). Use relationLoadStrategy: 'join' or dataloader for lists. Cache frequent reads with Redis; indexes on foreign keys. Monitor with prisma.$metrics.json() endpoint.

Code

// BAD: N+1
const users = await prisma.user.findMany();
for (const u of users) u.posts = await prisma.post.findMany({ where: { userId: u.id } });

// GOOD
const users = await prisma.user.findMany({
  include: { posts: true },  // or join strategy
  where: { id: { in: userIds } }
});
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How to fix N+1 queries in Prisma + NestJS under high load?

Profile with Prisma's queryRaw logging or Studio; batch via findMany({ where: { id: { in: ids } } }). Use relationLoadStrategy: 'join' or dataloader for lists. Cache frequent reads with Redis; indexes on foreign keys. Monitor with prisma.$metrics.json() endpoint.

Code

// BAD: N+1
const users = await prisma.user.findMany();
for (const u of users) u.posts = await prisma.post.findMany({ where: { userId: u.id } });

// GOOD
const users = await prisma.user.findMany({
  include: { posts: true },  // or join strategy
  where: { id: { in: userIds } }
});