# Page Not Found

The URL `ref/mdb/error-codes/ER_DUP_INDEX` does not exist.

You might be looking for one of these pages:
- [Error Codes](https://mariadb.com/docs/server/reference/error-codes.md)
- [SOUNDEX](https://mariadb.com/docs/server/reference/sql-functions/string-functions/soundex.md)
- [DROP INDEX](https://mariadb.com/docs/server/reference/sql-statements/data-definition/drop/drop-index.md)
- [SUBSTRING_INDEX](https://mariadb.com/docs/server/reference/sql-functions/string-functions/substring_index.md)
- [SPATIAL INDEX](https://mariadb.com/docs/server/reference/sql-structure/geometry/spatial-index.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://mariadb.com/docs/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://mariadb.com/docs/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/docs/server/reference/error-codes.md`)
- Use `Accept: text/markdown` header for content negotiation