单项选择题
A. Restore the database from a whole consistent backup and start the database in MOUNT mode. Then， open the database with the RESETLOGS option after performing a cancel-based recovery.
B. Restore the database from a whole consistent backup and start the database in MOUNT mode. Then， drop the lost redo log group and open the database with the RESETLOGS option after performing a cancel-based recovery.
C. Restore the database from a whole consistent backup and start the database in MOUNT mode. Then， clear the lost redo log group and open the database with the RESETLOGS option after performing a cancel-based recovery.
D. Do nothing. You do not need to recover the database in this case； an instance recovery will be performed by the SMON process on startup.
多项选择题 The ORDERS table in the database of a company contains one million records. The table is stored in the DATA tablespace and the index created on the ORDERS table is stored in the index tablespace named INDEXES. On Monday， you failed to start the database because the datafiles of the INDEXES tablespace were missing. You dropped and recreated the INDEXES tablespace by issuing the following command： SQL>DROP TABLESPACE INDEXES INCLUDING CONTENTS； SQL> CREATE TABLESPACE INDEXES DATAFILE ’C：\ORACLE\ORADATA\ORA101t\INDEX01.DBF’ SIZE 50m； After that， you issued the following command to recreate the index： CREATE UNIQUE INDEX sales_index_pk ON sales （order_id） PCTFREE 10 INITRANS 2 MAXTRANS 255 TABLESPACE indexes STORAGE （ INITIAL 1m NEXT 1m PCTINCREASE 0 MINEXTENTS 1 MAXEXTENTS 8192 ） NOLOGGING PARALLEL（ degree 4） Which two clauses are responsible for reducing the time for the recreation of the index？（）
单项选择题 YouareaDatabaseAdministratorwithTXGlobal.YouuseapasswordfiletoestablishremoteconnectionstotheHRdatabaseontheserverlocatedatthehomeoffice.Currently，twoactiveremotesessionsexisttothisdatabase.ThesesessionswereestablishedusingtheSYSDBAprivilegefromtheremotemachines.Youaccidentallydeletedthepasswordfile.Whatwillbetheconsequenceofthisaction？（）
单项选择题 You are a Database Administrator with WonderWeb. You use a password file to establish connections to the Sales database located on the server. You created the password file using the following command： ORAPWD file=d：\oracle\ora9i\orapwU01 password=admin entries=4 You erroneously deleted the password file while the database was running. You re-create the password file using the following command： ORAPWD file=d：\oracle\ora9i\orapwU01 password=change_on_install entries=4 However， when you try to connect as the SYS user， you receive the following error： ORA-01031： insufficient privileges What should you do to resolve this error？（）