ORA-30948: Illegal in-place XML schema evolution operation: string
Cause: An attempt was made to make an XML schema change that is not permitted through in-place XML schema evolution.
Action: Ensure that the XML schema changes specified in the XMLDiff argument to DBMS_XMLSCHEMA.inPlaceEvolve are permitted.
ORA-30948错误是一个不合法的XML架构演变操作错误。
ORA-30948: Illegal In-place XML Schema Evolution Operation:
Cause: An attempt was made to perform an in-place XML Schema evolution operation which is not supported.
Action: Modifications to an XMLType are not supported if the data is stored as binary XML.
ORA-30948错误通常是由于XML架构演变操作不合法导致的。一些典型的案例如:当尝试在存储数据为二进制XML的情况下对XMLType进行修改操作;试图更改XML Schema的操作如在XMLType下添加或删除节点等等。
1、尝试获得准确的故障信息:发生ORA-30948错误时应查看诊断信息,以找出准确的错误原因;
2、根据准确的信息去修复:应尝试在XMLType上更改数据,而不是在其中的二进制XML上做修改;
3、遵循正确的XML Schema演变操作:应尝试遵循正确的XML Schema演变操作,即先将XMLType转换为XML DOM,然后再进行更改操作;
4、保留备份:为防止出现异常错误,在进行修改操作前,应先进行备份;
5、查看相关文档:可以查看相关官网文档,以获得关于XML Schema演变操作的更多信息,以便更好地处理相关问题。