单项选择题 YouareworkingonthePRODdatabase，whichisinNOARCHIVELOGmode.Youlosttheactiveonlineredologgroupduetoamediafailure.Howshouldyourecoveryourdatabase？（）

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？（）