文档解释
ORA-12491: DBHIGH value does not dominate DBLOW
Cause: You attempted to enter a value for DBHIGH that did not dominate DBLOW.
Action: Enter a value for DBHIGH that dominates DBLOW.
ORA-12491：DBHIGH值不能大于DBLOW值
官方解释
常见案例
正常处理方法及步骤
1、确保DBLOW值小于DBHIGH值；
2、重新设置DBLOW值，其最终值需要小于DBHIGH值；
3、重新启动数据库，检查正确的DBLOW和DBHIGH值是否已设置；
4、如果DBLOW或DBHIGH值未正确设置，则需要重新设置这些值，并重新启动数据库。
