Prisma Connection Error (Too many clients)
I was coding some new features in my app, and it suddenly started showing this error. I checked the server to see if I had changed anything there, but I didn’t — the last commits were only on the client side.
This is an app I’ve been building since last year, and I already have a client using it. The new features were shipped, and now this error just appeared unexpectedly.
Wasp version: 0.16.5
Thank you all for your support
6 Replies
Hi @Stefan Vitória. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
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The "Prisma Connection Error (Too many clients)" typically means your server is creating too many instances of the PrismaClient, which exhausts the connection pool. This is a common issue in Node.js apps if the PrismaClient is instantiated inside a function that runs multiple times (e.g., inside a request handler), rather than being created once and reused.
Based on the knowledge sources provided, there is no direct mention of this specific error ("Too many clients") in Wasp documentation or issues. However, related Prisma client initialization and connection issues have been discussed, such as problems with Prisma client generation, version mismatches, and environment setup. For example, issues can arise if the Prisma client is not generated properly or if there are mismatches in Prisma versions, but these are not directly tied to the "too many clients" error [Investigate Prisma client initialization error on first start after clean].
What you can try:
- Ensure that the PrismaClient is not being instantiated multiple times. In Wasp, this is typically handled for you, but if you have custom server code, double-check that you are not creating a new PrismaClient in every request or function call.
- Try running
The knowledge sources do not contain explicit information about the "Too many clients" error in Wasp, but general Prisma best practices apply. Make sure you are not creating multiple PrismaClient instances, and try cleaning and restarting your Wasp project. If the issue continues, consider sharing more details or opening an issue with the Wasp team. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ---------------------- Sorry @Stefan Vitória, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist: Perhaps try again in 15mins?
wasp clean and then wasp start to reset the build and clear any stale state, as this has resolved other Prisma-related issues for users [Discord: Prisma Error on Mac].
- If you have recently changed dependencies or upgraded Prisma, ensure that the versions of prisma and @prisma/client match, and regenerate the client if needed.
If the problem persists and you have not made any server-side changes, it could be a result of increased traffic or a bug introduced by a dependency update. If you are running in a serverless environment, be aware that cold starts can also lead to multiple PrismaClient instances.
Summary:The knowledge sources do not contain explicit information about the "Too many clients" error in Wasp, but general Prisma best practices apply. Make sure you are not creating multiple PrismaClient instances, and try cleaning and restarting your Wasp project. If the issue continues, consider sharing more details or opening an issue with the Wasp team. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ---------------------- Sorry @Stefan Vitória, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist: Perhaps try again in 15mins?
I will summon @miho in case he knows the problem right of the bat. If not, I'll investigate
I can't say I have encountered this error - found this by Googling https://github.com/prisma/prisma/issues/1983
GitHub
"FATAL: sorry, too many clients already" postgres error in develop ...
Bug description I use prisma inside an api-route of https://nextjs.org/ (this is by the way an awesome setup) for a graphql-api. After some time you will get this error: Error in connector: Error q...
Hm, looks like it's a hot reloading issue
@Stefan Vitória check the EDIT in the issue miho linked
Did this happen once or is it a reocurring problem?
Hello guys. @sodic @miho
I believe I've resolved the issue. It only occurred a couple of times in the same project. While I can't be sure the root cause is the same—since I'm not familiar with Wasp's internal connection management—the error message was similar to a common one in Next.js.
My issue seemed to be at the database server level. I moved the Postgres database to a dedicated VPS that only this application uses, and the problem hasn't recurred since.
I suspect the original problem was related to the Postgres instance being shared by several development apps. This is a bad practice, but I hadn't prioritized it for development environments. I've since moved each app to its own database instance.
I prefer to host the database on a separate server because I run many services in Docker, and this allows me to avoid starting a new database service for each one. Thanks for your help!
Hm, that's strange because I do the same thing (share the same DB instance for multiple apps) and haven't run into the problem
Perhaps my apps never got big enough
Anyway, glad you fixed it. Let us know if it happens again 🙂