[单选] During a system boot, an error message appears concerning a paging space, paging00. The paging space was located on hdisk2, but the disk was removed from the system without proper software procedures. Which of the following commands should be used as the first step in the process of recovery?（）

Consider the following scenario for your database: Which statement is true regarding the backup of the TOOLS tablespace?（） The RMAN backup fails because the TOOLS tablespace is read-only。 The RMAN skips the backup of the tablespace because backup optimization is enabled。 The RMAN makes backup because optimization can be enabled only for backups to disk。 The RMAN makes the backup because no backup of the tablespace exists within the seven day window。 用最小平方法拟合直线趋势方程ŷt=a+bt，若b为负数，则该现象趋势为（）。 上升趋势。 下降趋势。 水平趋势。 随机波动。 紧急限压阀在限压状态时各部位的位置与其在（）状态时相同。 缓解。 正在缓解。 制动。 阶段缓解。 要指标法 What system startup file would an administrator edit for starting up miscellaneous third party applications？（） /etc/rc.net。 /etc/rc.boot。 /etc/rc.local。 /etc/rc.tcpi。 During a system boot, an error message appears concerning a paging space, paging00. The paging space was located on hdisk2, but the disk was removed from the system without proper software procedures. Which of the following commands should be used as the first step in the process of recovery?（）