ORA-03893：Shard DDL cannot be executed as SYS because the following shards need to be upgraded to at least Oracle Database 21c
错误码
错误描述：Shard DDL cannot be executed as SYS because the following shards need to be upgraded to at least Oracle Database 21c
错误原因：An attempt was made to execute shard DDL as user SYS. This is insecure unless it can be encrypted.
解决方法：Either execute the DDL as another user, or upgrade the listed shards to at least Oracle Database 21c and update them to support encryption.
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