按官方解释如下:
DRG-10528 primary keys of type string are not allowed
Cause:
An attempt was made to create an index on a table with an illegal primary key datatype.
Action:
Change the text key to one of the followings: VARCHAR2, NUMBER, VARCHAR, DATE, CHAR, MLSLABEL.
确保创建索引的表主键类型为VARCHAR2, NUMBER, VARCHAR, DATE, CHAR或MLSLABEL.