# 心跳数据格式介绍
针对MySQL \> Kafka、PostgreSQL \> Kafka、GaussDB \> Kafka、Oracle \> Kafka链路，支持配置将心跳表数据输出至Topic。心跳表数据的输出格式与链路配置的数据格式保持一致，包括Canal-Json和Debezium-Json两种类型，分别如下： 与普通数据格式的主要区别在于新增isHeartbeat字段，其值为true，下游数据处理程序可根据该字段过滤心跳表数据。
- **Canal-Json**
  ```
  {
  "id": 39,
  "serverId": "1753240249",
  "data": [
  {
  "dlf_job_id": "1129476",
  "external_job_id": "158663",
  "heartbeat": 1768910859110
  }
  ],
  "old": [
  {
  "dlf_job_id": "1129476",
  "external_job_id": "158663",
  "heartbeat": 1768910829110
  }
  ],
  "es": 1768910859000,
  "table": "your_heartbeat_table_name",
  "type": "UPDATE",
  "database": "your_database_name",
  "ts": 1768910859116,
  "mysqlType": {
  "dlf_job_id": "VARCHAR(128)",
  "external_job_id": "VARCHAR(128)",
  "heartbeat": "BIGINT(20)"
  },
  "sqlType": {
  "dlf_job_id": 12,
  "external_job_id": 12,
  "heartbeat": -5
  },
  "dbType": "mysql",
  "isDdl": false,"pkNames": [
  "dlf_job_id"
  ],
  "dataSourceName": "mysql_binlog_source",
  "isHeartbeat": true
  }
  ```
  
- **Debezium-Json**
  ```
  {
  "before": {
  "dlf_job_id": "1129476",
  "external_job_id": "158703",
  "heartbeat": 1768987457610
  },
  "after": {
  "dlf_job_id": "1129476",
  "external_job_id": "158703",
  "heartbeat": 1768987487610
  },
  "source": {
  "name": "mysql_binlog_source",
  "db": "your_database_name",
  "table": "your_heartbeat_table_name",
  "pkNames": [
  "dlf_job_id"
  ],
  "sqlType": {
  "dlf_job_id": 12,
  "external_job_id": 12,
  "heartbeat": -5
  },
  "mysqlType": {
  "dlf_job_id": "VARCHAR(128)",
  "external_job_id": "VARCHAR(128)",
  "heartbeat": "BIGINT(20)"
  }
  },
  "tableChange": {
  "type": "CREATE",
  "previousId": null,
  "id": {},
  "table": {}
  },
  "tsMs": 1768987487000,
  "op": "u",
  "dataSourceName": "mysql_binlog_source",
  "dbType": "mysql",
  "isHeartbeat": true
  }
  ```