如何更改SCHEDULER任务的START_DATE时间

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如何更改一个定时任务的START_DATE / NEXT_RUN_DATE 时间？

有朋友修改服务器的时间后，所有定时任务停止运行，因为其运行时间处于未来，如下范例：

SQL> select job_name,state,enabled,start_date,next_run_date from DBA_SCHEDULER_JOBS;

JOB_NAME STATE ENABL START_DATE NEXT_RUN_DATE
------------------------------ --------------- ----- ---------------------------------------- ----------------------------------------
GATHER_STATS_JOB DISABLED FALSE 31-OCT-14 11.18.02.000000 PM +08:00 31-OCT-14 11.18.02.000000 PM +08:00

修复这个时间异常可以使用如下方法，先禁用任务，再通过SET_ATTRIBUTE的方式来修改：

SQL> exec dbms_scheduler.disable('gather_stats_job');

PL/SQL procedure successfully completed.

SQL> exec dbms_scheduler.set_attribute ('GATHER_STATS_JOB','start_date',systimestamp);

PL/SQL procedure successfully completed.

SQL> select job_name,state,enabled,start_date,next_run_date from DBA_SCHEDULER_JOBS;

JOB_NAME               STATE           ENABL START_DATE                   NEXT_RUN_DATE
------------------------------ --------------- ----- ---------------------------------------- ----------------------------------------
GATHER_STATS_JOB           DISABLED        FALSE 04-FEB-12 11.19.30.550122 PM +08:00      31-OCT-14 11.18.02.000000 PM +08:00

SQL> exec dbms_scheduler.enable('gather_stats_job');

PL/SQL procedure successfully completed.

SQL> select job_name,state,enabled,start_date,next_run_date from DBA_SCHEDULER_JOBS;

JOB_NAME               STATE           ENABL START_DATE                   NEXT_RUN_DATE
------------------------------ --------------- ----- ---------------------------------------- ----------------------------------------
GATHER_STATS_JOB           RUNNING           TRUE 04-FEB-12 11.19.30.550122 PM +08:00      04-FEB-12 11.19.46.692031 PM +08:00

可以看到在启用SCHEDULER之后，NEXT_RUN_DATE会自动计算为正常值。

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