You work as a database administrator for Supportcenter.cn. You started the instance using theinit.orafile. You have two control files and three redo log groups in your database. You decided to protect the database against failures by adding one more control file. Which file is the appropriate way to perform this task?()
A. Shut down the instance, copy the control file to the third location and open the database.
B. Abort the instance, copy the control file to the third location, modify the CONTROL_FILES parameter in theinit.orafile and open the database.
Copy the control file to the third location, modify the CONTROL_FILES parameter in theinit.orafile, restart the instance and open the database.
D. Shut down the instance, copy the control file to the third location, modify the CONTROL_FILES parameter in theinit.orafile and open the database.
E. Shut down the instance, startup in the mount state, copy the control file to the third location, modify the CONTROL_FILES parameter ininit.oraand open the database.
【背景资料】郑州市某小区6号楼工程由某某建筑集团第一分公司承建。2008年11月20日主体结构及砌体全部施工完毕。至2008年11月粉刷施工队开始进场施工,到2009年5月25日大面积粉刷结束,在2009年4月份大检查时发现个别房间粉刷层空鼓但无裂缝,开始组织少量人员进行维修,到2009年5月20日再次大检查时发现大部分房间粉刷层空鼓并且墙面有很多裂纹,这时引起公司重视,开始组织专家到现场查勘并查找墙面粉刷层空鼓、裂缝的原因。 请根据背景资料完成以下选项。石灰膏熟化时间,常温一般不少于();用于罩面灰时,熟化时间不应少于()。
A. 7d,10d
B. 15d,20d
C. 15d,25d
D. 15d,30d