ORA-39252: Importing a SecureFile LOB with metadata or archived SecureFile LOB into a BasicFile LOB is not allowed
Cause: An attempt was made to import a SecureFile LOB that contained metadata or was archived at the time of export into a BasicFile LOB.
Action: Perform the import into a different table, perform DBMS_LOB.ARCHIVE_GET on any archived SecureFile LOBs, and then use INSERT AS SELECT to migrate the SecureFile LOB data to the BasicFile LOB.
这个错误表明，Oracle不允许将含有元数据或存档文件的SecureFile LOB导入到BasicFile LOB。
此错误代码的官方解释为“不允许将具有元数据/存档SecureFile LOB导入到BasicFile LOB”。尝试进行此操作时，会收到ORA-39252错误代码。
1.首先，检查需要导入的SecureFile LOB数据是否包含元数据。
2.然后，检查要存储的SecureFile LOB的目的是否是BasicFile LOB。
3.将此SecureFile LOB的目的更改为BasicFile LOB。
4.再次尝试导入此SecureFile LOB，然后再次检查是否存在这些元数据。
5.确保导入它的元数据后，尝试继续将其导入BasicFile中。
6.最后，确保该SecureFile LOB已成功导入到BasicFile LOB中。