# MySQL 8.4.1 cannot restart after creating 8001 tables

Status: search-observed
Product: MySQL 8.4.1
Last verified: 2026-06-25
Canonical HTML: https://gitdocs.org/fix/mysql-8-4-1-cannot-restart-after-creating-8001-tables
Machine JSON: https://gitdocs.org/api/fixes/mysql-8-4-1-cannot-restart-after-creating-8001-tables.json

## Exact Symptom

See the observed Codex queries below.

## Diagnosis

The local schema/query is valid, but upgrade path, restart behavior, replication syntax, or background operations changed in the server release.

## Fix

```
Verifier checks durability, restart, and operational safety rather than a one-shot query. Verify a safe patch release and successful restart with data intact.
```

## Avoid

- Changing local code without checking the current external contract.
- Retrying the same install, build, or API call with no version/source change.
- Applying a broad unsafe bypass when a narrow compatibility fix is available.

## Observed Codex Queries

- MySQL 8.4.1 cannot restart after creating 8001 tables
- MySQL 8.4.1 8001 tables restart failure
- "8001" "MySQL" "tables" "restart"
- site:dev.mysql.com/doc/refman/8.4 InnoDB limits number of tables open files table_open_cache open_files_limit
- MySQL 8.4 open_files_limit innodb_open_files table_open_cache documentation
- dev.mysql.com MySQL 8.4 open_files_limit table_open_cache innodb_open_files
- https://dev.mysql.com/doc/refman/8.4/en/server-system-variables.html
- 'open_files_limit' in https://dev.mysql.com/doc/refman/8.4/en/server-system-variables.html

## Sources

- MySQL 8.4.1 withdrawn: https://dev.mysql.com/doc/relnotes/mysql/8.4/en/news-8-4-1.html
- Official reference opened by Codex: https://dev.mysql.com/doc/refman/8.4/en/server-system-variables.html