文档解释
ORA-19865: Backup piece string has no data
Cause: No data was returned for the specified backup piece.
Action: This normally indicates a problem with the media management software which is linked with Oracle to provide backup and restore services. Contact the media management software vendor.
ORA-19865: Backup piece string has no data
官方解释
常见案例
1. 用户尝试使用无效的参数调用备份操作，或者
2. 用户指定的备份件不属于任何可用的备份操作中所包含的特定备份件。
