单项选择题
A. Delete the newly created password file and re-create another password file with the password admin， without shutting down the database.
B. Enable the operating system authentication， shut down the database， disable the operating system authentication， and restart the database using the password file.
C. Enable the operating system authentication， shut down the database， re-create the password file using the same ORAPWD command， and restart the database using the password file.
D. Delete the newly created password file， enable operating system authentication and shut down the database. Then， re-create another password file using the same ORAPWD command and restart the database using this password file.
单项选择题 Yourdatabasecontainsatemporarytablespace，indextablespace，undotablespace，andaread-onlytablespaceapartfromtheSYSTEMandSYSAUXtablespaces.Ifamediafailureoccursresultinginthelossofanyofthesetablespaces，whichtablespaceisNOTrequiredforthedatabasetostart？（）
单项选择题 Your database is in ARCHIVELOG mode. You have two online redo log groups each of which contains one redo member. When you attempt to start the database， you receive the following errors： ORA-00313： open failed for members of log group 1 of thread 1 ORA-00312： online log 1 thread 1： ’D：\REDO01.LOG’ You discover that the online redo log file of the current redo group is corrupted. Which statement should you use to resolve this issue？（）
单项选择题 You are working as a Database Administrator. Despite having a password in the data dictionary as change_on_install， you always log on to the database MYNEWDB using operating system authentication. Your organization is planning to recruit two junior-level DBAs. You decide to enable remote authentication in your database so that the new DBAs can log on to the database from their workstations to carry out administrative tasks. To allow the new DBAs to perform the administrative tasks， you create a password file on the database server using the following command： ORAPWD file=d：\oracle\ora9i\orapwU01 password=admin entries=4 After creating the password file， you remove the operating system authentication and change the value of the REMOTE_LOGIN_PASSWORDFILE parameter to EXCLUSIVE. You also create a net service name as MYNEWDB that allows the new DBAs to connect to the database server from their workstations using this net service name. Which command must you use to connect to the database to start it？（）