我们通过一个例子演示如何创建心跳表，以及如何执行定时任务来更新心跳表相关字段。

SQL> show user
USER is "SYS"

1 创建测试表
SQL> create table dg_heartbeat tablespace users as
select dbid, name, sysdate as last_update from v$database;

Table created.

SQL> select * from dg_heartbeat;

DBID NAME LAST_UPDATE
---------- ------------------------------ ---------------
2727953090 ZDHYJL 20200429 101928

2 定时job更新心跳表中的计时字段
SQL> var job number
SQL> exec dbms_job.submit(job => :job, what => 'update dg_heartbeat set last_update=sysdate;', next_date => trunc(sysdate, 'MM') + 1/1440, interval => 'sysdate + 1/1440');

PL/SQL procedure successfully completed.

SQL> print job

JOB
----------
1301

SQL> commit;

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