{
  "id": "python/flask-sqlalchemy-database-lock",
  "signature": "sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) database is locked",
  "signature_zh": "SQLAlchemy 操作错误：数据库被锁定。",
  "regex": "sqlalchemy\\.exc\\.OperationalError:\\ \\(sqlite3\\.OperationalError\\)\\ database\\ is\\ locked",
  "domain": "python",
  "category": "data_error",
  "subcategory": null,
  "root_cause": "SQLite database locked due to concurrent writes or uncommitted transactions in Flask app.",
  "root_cause_type": "generic",
  "root_cause_zh": "由于 Flask 应用中的并发写入或未提交事务，SQLite 数据库被锁定。",
  "versions": [
    {
      "version": "3.x",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "Timeout only waits for lock release; if transaction never commits, it still fails.",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Uncommitted sessions hold locks; need explicit commit or rollback.",
      "fail_rate": 0.8,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "",
      "success_rate": 0.8,
      "how": "Set SQLite timeout: engine = create_engine('sqlite:///app.db', connect_args={'timeout': 30})",
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "success_rate": 0.9,
      "how": "Use WAL mode: with engine.connect() as conn:\n    conn.execute(\"PRAGMA journal_mode=WAL\")",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": null,
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.86,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2024-09-01",
  "last_confirmed": "2025-01-01",
  "last_updated": "2025-01-01",
  "evidence_count": 0,
  "tags": [],
  "locale": "en",
  "aliases": []
}