The database Is configured in ARCHIVELOG mode. The database needs to be up 24 X 7. You want to perform user managed backup for the data files of the HR_DATA tablespace.To accomplish the task, you issued the following command: SQL> ALTER TABLESPACE hi_data BEGIN BACKUP; Which two statements are true in this scenario? （） No transaction on the tablespace is allowed but you can perform queries.。 The tablespace will automatically come out of backup mode when the file copy is complete.。 The checkpoint change number is frozen in headers of the data files until the file is removed from backup mode.。 The database writes the before image of an entire block to the redo stream before modifying. block tor the first time.。
分部工程验收由验收工作组负责，分部工程验收工作组由（）主持。 项目法人或监理单位。 施工单位的总负责人。 各方负责人共同。 质量监督机构。
创建一家属于自己的企业不是一件轻而易举的事情，必须具备一定的客观条件。例如：（）。 拥有专利技术。 拥有一定量的创业资金。 拥有工作经验和一定量的顾客群体。 拥有工商管理方面的教育背景。
用剖切平面把物体完全剖开后所得到的剖视图称为（）。 局部剖视图。 局部视图。 全剖视图。 端面图。
创业者打算购买一家现存企业之前，必须对其进行全面的审查，主要包括（）。 产品质量。 市场状况。 财务状况。 出售原因。
You work as a database administrator for Supportcenter.cn. You added atablespaceto your database. Because of the changes to the physical structure of your database， you performed a backup of the control file to trace. After this， you lost only the control files and the instance aborted due to a hardware failure. How would you proceed to recover the database？（）
