> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/reference/error-codes/mariadb-error-codes-4100-to-4199/e4159.md).

# Error 4159: Specified key part was too long; max key part length is

| Error Code | SQLSTATE    | Error                  | Description                                                      |
| ---------- | ----------- | ---------------------- | ---------------------------------------------------------------- |
| 4159       | 42000 S1009 | ER\_TOO\_LONG\_KEYPART | Specified key part was too long; max key part length is %u bytes |

## Possible Causes and Solutions

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