You are working in an online transaction processing (OLTP) environment. You use the FLASHBACKTABLE command to flash back the CUSTOMERS table. Before executing the FLASHBACK TABLE command, the system change number (SCN) was 663571. After flashing back the CUSTOMERS table, you realize that the table is not in the correct state. Now, you need to reverse the effects of the FLASHBACK TABLE command. Which is the fastest and the most efficient option to reverse the effects of the FLASHBACK TABLE command?()
A. Restore the backup control file and open the database with RESETLOGS option.
B. Perform point-in-time recovery because flashback cannot be performed again on this table
C. Execute the FLASHBACK DATABASE statement to retrieve the CUSTOMERS table as it was at SCN 663571
D. Execute another FLASHBACK TABLE statement to retrieve the CUSTOMERS table as it was at SCN 663571
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单相制零线的截面,()。
A. 不应小于相线截面的30%
B. 不应小于相线截面的50%
C. 不应小于相线截面的80%
D. 应与相线的截面相同
()转向架最能有效控制空气弹簧高度。
A. S220K型
B. C200K型
C. A96型
D. P200K型
凡有斜度的键所组成的联接,对中性必然差。()
A. 正确
B. 错误
What is the purpose of /etc/uucp/Devices?()
A. Defines permissions for remote machines contacting the local machine through BNU
B. Specifies dialer and modem types for uucp connections
C. Defines basic communication parameters
D. Assigns alternate or additional Systems, Devices and Dialers file