ou are using the flash recovery area (fast recovery area in 11g Release 2) to store backup related files in your database. After regular monitoring of space usage in the Mash recovery area. You realize that the flash recovery area is (jetting filled up very fast and it is running out of space. Your database flash recovery area is low on specie and you have no more room on disk. Proactively, which two options could you use to make more space available in the flash recovery()
A. Change the RMAN archived log deletion policy.
B. Use the RMAN CROSSCHECK command to reclaim the archived log space.
Change the RMAN retention policy to retain backups for a shorter period of time.
D. Use OS command to move files from the flash recovery area to some other location.
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简述文书、公文和文件的三者之间的区别与联系及三者的概念起源。
ZPW-2000A型无绝缘轨道电路发送器为()冗余,接收器为()主备使用。
翡翠的透明度如何,珠宝界称为“几分水”,一分水是指()厚的翡翠。
A. 6mm
B. 5mm
C. 4mm
D. 3mm
收发两端之间的传输距离为1000km,信号在媒体上的传播速率为2×108m/s。试计算以下两种情况的发送时延和传播时延:(1)数据长度为107bit,数据发送速率为100kbit/s,传播距离为1000km。(2)数据长度为103bit,数据发送速率为1Gbit/s。从以上计算结果可以得出什么结论?