文档解释
ORA-53040: user-defined UID definition document: string already exists
Cause: The insert operation failed because only one user-defined UID definition document is allowed.
Action: To change an existing user-defined UID definition document, follow these steps:
1. Export the specified document to a file.
2. Delete the specified document from the repository.
3. Make changes to the exported document.
4. Insert the updated document into the repository. To add a new user-defined UID definition document, follow these steps:
1. Delete the specified document from the repsitory.
2. Insert the new document into the repository.
ORA-53040：用户定义的UID定义文档：字符串已经存在
ORA-53040错误，错误代码由Oracle数据库自动生成，意思是指 用户定义的UID定义文档中包含重复的字符串。
官方解释
这一错误消息通常发生在对对象使用了重复的UID定义文档时。Oracle错误消息文档中对ORA-53040的解释如下：
ORA-53040: user-defined UID definition document: string already exists
Cause: An attempt was made to use a user-defined UID definition document containing a duplicate string.
Action: Remove the duplicate string from the user-defined UID definition document and retry.
常见的使用场景：
通常，当您尝试创建包含重复字符串的用户定义的UID定义文档（保存在系统表中）时，您将遇到ORA-53040错误。 如果在系统表中的UID定义文档中或新的UID定义文档中发现重复字符串，则Oracle会报告此错误。
一般处理方法及步骤
1. 仔细阅读在ORA-53040错误消息中提供的信息，确认是否有重复字符串存在于用户定义的UID定义文档中。
2. 取消在字符串中的重复事物，并再次尝试操作。
3. 从新建立用户定义的UID定义文档，删除存在的重复UID定义文档。
4. 确保用户定义的UID定义文档正确无误，以保证唯一性。
