You are working on a 24X7 database. You want to design a backup strategy for your database that uses user managed backups. You want to be able to perform all backups while the database remains online. Which statement about performing user-managed backups in a 24x7 environment is true?（） [" You must have change tracking enabled in your database"," Your database must be running in NOARCHIVELOG mode"," To back up a tablespace, it must be in backup mode"," To back up a tablespace, it must first be taken offline"]
在学前儿童语言教育活动中，教师的适宜性提问一般包括哪些方式？
You executed the following command in Recovery Manager （RMAN） against your Oracle 10g database： RMAN> REPORT NEED BACKUP days 3; What would be the output of this command？（） ["a list of files that require a backup within three days","a list of files that have not been backed up for three days","a list of files that RMAN recommends be backed up only once in every three days， based on low volatility","a list of files for which a backup has already been performed and may need a backup after three day"]
双代号网络计划中，关于最迟开始时间和最迟完成时间的计算表述中，正确的是（）。 ["以网络计划的终点节点为箭头节点的工作的最迟完成时间等于要求工期","最迟完成时间等于各紧后工作的最迟开始时间减去其持续时间","最迟完成时间等于各紧后工作的最迟开始时间的最小值","最迟开始时间等于各紧后工作的最迟开始时间的最小值"]
What methods of point-in-time recovery are available？（） [" Change-based"," Cancel-based"," Time-based"," Sequence number-based"," Transaction number-based"]
如何应付应激？
