监控作业发现一台服务器（Red Hat Enterprise Linux Server release 5.7）从凌晨1:32开始，有一小段时间无法响应，数据库也连接不上，后面又正常了。早上检查了监听日志，并没有发现错误信息。但是检查告警日志，发现有下面错误信息：
Thread 1 advanced to log sequence 19749 (LGWR switch)
Current log# 2 seq# 19749 mem# 0: /u01/oradata/epps/redo02.log
Current log# 2 seq# 19749 mem# 1: /u03/oradata/epps/redo021.log
Wed Aug 17 01:37:08 2016
kkjcre1p: unable to spawn jobq slave process
Wed Aug 17 01:37:08 2016
Errors in file /u01/app/oracle/admin/epps/bdump/epps_cjq0_4094.trc:
Wed Aug 17 01:56:44 2016
kkjcre1p: unable to spawn jobq slave process
Wed Aug 17 01:56:44 2016
Errors in file /u01/app/oracle/admin/epps/bdump/epps_cjq0_4094.trc: