ORA-03819：DDL operations are not allowed under enabled shard DDL in a federated database setup.
错误码
错误描述：DDL operations are not allowed under enabled shard DDL in a federated database setup.
错误原因：An attempt was made to perform a DDL (data definition language) operation on a federated database catalog while shard DDL was enabled.
解决方法：Do not perform any DDL operations other than ALTER TABLE EXTERNALLY on federated database tables in the catalog while shard DDL is enabled.
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