Examine the following RMAN script: RMAN> run { debug on; allocate channel c1 type disk; backup datafile 5; } Which statement describes the purpose of the script?()
A. The data file is checked for physical corruption and backed up if found clean.
B. The backup of data file 5 is performed and the interactive messages during the backup are suppressed.
C. The existing backup for the data file is checked and the backup is performed if there are changes in the data file after the last backup.
D. The backup of data file 5 is performed and all SQL statements that are executed during RMAN compilation and their results are displayed
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任何事物内部都具有肯定和否定两个方面,否定方面是指:()
A. 事物发展的积极方面
B. 促使事物灭亡的方面
C. 保持事物存在的方面
D. 符合事物发展和人的需要的方面
()是俄罗斯古典民族乐派的创始人,被誉为“俄罗斯音乐之父”。
A. 柴科夫斯基
B. 格林卡
C. 肖斯塔科维奇
注射模具工作零件一般可选用()并根据材料和使用要求提出热处理要求。
A. 普通碳素结构钢
B. 优质碳素结构钢
C. 特种钢材
D. 较好的合金材料
《王贵与李香香》是()创作的民歌体叙事长诗,采用了陕北民歌()的形式。