标题: ORA-12717: Cannot issue ALTER DATABASE [打印本页] 作者: admin 时间: 2016-8-10 13:56 标题: ORA-12717: Cannot issue ALTER DATABASE ORA-12717: Cannotissue ALTER DATABASE NATIONAL CHARACTER SET when NCLOB, NCHAR or NVARCHAR2 data exists Cause: NCLOB, NCHAR or NVARCHAR2 data changed therepresentation to
Unicode when converting to a multibyte character set and must be migrated. Action: RemoveNCLOB, NCHAR or NVARCHAR2 data as listed in the alert file.