文档解释
ORA-28593: agent control utility: command terminated with error
Cause: An error occurred during the processing of the command. There could be several causes. A SET or an UNSET command could have been issued after the agent was started. This is illegal. The user may have attempted to start two agents with the same SID value or the user could have attempted to shutdown an agent that is no longer running.
Action: If the user wishes to issue a SET or an UNSET command, he should make sure the agent is shutdown first by issuing the SHUTDOWN command.
ORA-28593错误为数据库内部错误，表明由于某种原因，包括agent control utility（eg JVM的Lua解释器）的命令被意外终止。
Oracle官方描述说，ORA-28593错误代表一个内部错误，暗示由于某些未知原因，一个agent control utility（例如LUA解释器）的命令被意外地终止。
常见的ORA-28593错误案例包括：
1、当用户启动任务，而任务中的agent control utility不存在时；
2、当用户尝试启动已启动的任务；
3、当agent control utility在尝试执行操作期间出现故障时。
一般处理方法及步骤
1、确定存在此ORA-28593错误的原因，并确定是否可重建此任务；
2、根据实际情况重新启动或重建任务；
3、如果问题仍然存在，请检查数据库日志，查看停止操作时发生了什么；
4、检查已配置的操作系统或特定的agent control utility的日志文件，寻找其他相关信息；
5、如果还找不到问题的原因，应在Oracle官方论坛上寻求帮助。
