PlanetScale Prisma Connection Errors

How to fix it

Try these in order — the most common fix is first.

1. 1. Set relationMode correctly

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   1. In schema.prisma set relationMode = "prisma" if foreign keys are disabled
   2. Add @@index on relation fields
   Did this fix it? Yes No

2. 2. Tune pool and timeouts

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   1. Add connection_limit and pool_timeout to the URL
   2. Reconnect at least once a day
   Did this fix it? Yes No

3. 3. Use the serverless driver on edge

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   1. Install @planetscale/database
   2. Use the Prisma driver adapter for edge runtimes
   Did this fix it? Yes No

Symptoms

Prisma throws connection errors, timeouts or missing foreign key behaviour.

Why it happens

• relationMode not set when foreign keys are off
• Pool size too high or too low
• Connections held open over 24 hours

This guide also covers

• planetscale prisma error
• planetscale next.js connection

The same problem in other apps

All not loading, error messages & connection guides →

• Supabase Max Client Connections Reached (Supabase)

Other PlanetScale errors

• PlanetScale Transaction Pool Connection Limit Exceeded
• PlanetScale Foreign Key Constraints Not Working
• PlanetScale Safe Migrations: DDL Statement Rejected
• PlanetScale Query Exceeded Row or Time Limit
• PlanetScale Postgres Import Fails or Is Slow
• PlanetScale Postgres Extension Not Available
• PlanetScale Unexpected Bill: Storage, Backups and Transfer
• PlanetScale Connection Errors During Outage