ora-19809: limit exceeded for recovery files

错误代码：

ora-19809: limit exceeded for recovery files

错误原因：

闪回恢复区flash_recovery_area目录容量已满

解决方法：

1. 设置归档到其他目录，修改alter system set log_archive_dest = 其他目录 

2. 转移或删除闪回恢复区里的归档日志 

3. 缩短备份保留时间，改为较小的保留期

change the backup retention policy to retain the backups for a smaller period of time

4. 增大闪回恢复区。alter system set db_recovery_file_dest_size = 5g