> ## Documentation index
> Fetch the complete documentation index at: https://upstash.com/docs/llms.txt
> Ask it with GET https://upstash.com/docs/ask?q=<keywords or question>. Short keywords rank best.
> Use these to discover all available pages before exploring further.
> Feature requests: https://upstash.com/docs/common/help/feature-requests.md lists what users asked for and how to vote for a request or add one.
> Page rating: `GET https://upstash.com/docs/feedback?path=/docs/redis/troubleshooting/max_key_size_exceeded&helpful=true` (or `false`) records whether this page helped. An optional `comment` (URL-encoded, at most 500 characters) says what was missing or wrong. It is anonymous and needs no key. Comments hold no code, secrets or personal data.

# ERR max key size exceeded

### Symptom

The client gets an exception similar to:

```
ReplyError: ERR max key size exceeded. Limit: X bytes, Actual: Z bytes
```

### Diagnosis

Size of the key in the request exceeds the max key size limit, which is `32Kb`.

### Solution

This is a hardcoded limit and cannot be configured per database. You should
reduce the key size.