突然发现，从9月1号开始，系统中定义的所有Job就没有再定时执行过了，网上找了一大堆和job相关的参数，逐个检查，没有发现问题。
后来无意间看到alert日志中，大量的如下信息
Thu Sep 1 07:05:05 2011
Restarting dead background process QMNC
QMNC started with pid=103, OS id=29598
Thu Sep 1 07:10:26 2011
Restarting dead background process QMNC
QMNC started with pid=103, OS id=31177
Thu Sep 1 07:15:50 2011
Restarting dead background process QMNC
QMNC started with pid=65, OS id=32729
Thu Sep 1 07:21:14 2011
Restarting dead background process QMNC
QMNC started with pid=103, OS id=1872
Thu Sep 1 07:26:36 2011
Restarting dead background process QMNC
QMNC started with pid=103, OS id=3519
Thu Sep 1 07:32:09 2011
Restarting dead background process QMNC
QMNC started with pid=103, OS id=5107
Thu Sep 1 07:37:36 2011
Restarting dead background process QMNC
QMNC started with pid=26, OS id=6689
Restarting dead background process QMNC
QMNC started with pid=103, OS id=29598
Thu Sep 1 07:10:26 2011
Restarting dead background process QMNC
QMNC started with pid=103, OS id=31177
Thu Sep 1 07:15:50 2011
Restarting dead background process QMNC
QMNC started with pid=65, OS id=32729
Thu Sep 1 07:21:14 2011
Restarting dead background process QMNC
QMNC started with pid=103, OS id=1872
Thu Sep 1 07:26:36 2011
Restarting dead background process QMNC
QMNC started with pid=103, OS id=3519
Thu Sep 1 07:32:09 2011
Restarting dead background process QMNC
QMNC started with pid=103, OS id=5107
Thu Sep 1 07:37:36 2011
Restarting dead background process QMNC
QMNC started with pid=26, OS id=6689
看来是个别进程被关闭了，在后台自动重启。引起这个的原因，就是shutdown数据库的时候，中途取消了。解决这个问题很简单，重启一下就可以了。
shutdown 在startup，问题解决，job 恢复正常。
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/9399028/viewspace-707741/ ，如需转载，请注明出处，否则将追究法律责任。
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