ORA-25427: cannot downgrade database links after database link data dictionary has been upgraded

文档解释

ORA-25427: cannot downgrade database links after database link data dictionary has been upgraded

Cause: An attempt was made to downgrade after the upgrade of the database link data dictionary.

Action: Drop the database links before attempting the downgrade.

ORA-25427表示不能在数据库链接数据字典已升级之后降级数据库链接。

官方解释

常见案例

一般处理方法及步骤

1.运行CATALOG.SQL脚本中的前23篇文章，重置数据库链接的数据库字典项。

2.在用户应用回退补丁之前，升级或降级数据库链接到正确的版本。

3.打用户应用补丁并重新创建数据库链接，以恢复正确的行为。