单项选择题
A.On Wednesday， the statistics have been purged.
B.On Wednesday， the retention period has been set to zero.
C.On Wednesday， the collection interval has been set to zero.
D.On Wednesday， the collection level has been changed to All.
E.On Wednesday， the retention period has been set to one day.
F.On Wednesday， the retention period has been set to two days.
G.On Wednesday， the collection level has been changed to Typical.
H.On Wednesday， the collection interval has been set to 1440 minutes.
单项选择题 You execute the following set of commands to create a database user and to grant the system privileges in your production environment. SQL> CREATE USER user01 IDENTIFIED BY oracle DEFAULT TABLESPACE tbs1 TEMPORARY TABLESPACE temp PROFILE default / SQL> GRANT create session， create table TO user01； While executing the command to create a table， the user gets the following error message and the CREATE TABLE.. command fails. ERROR at line 1： ORA-01950： no privileges on tablespace What could be the possible reason for this error message？（）
单项选择题 Redologfilesarenotmultiplexedinyourdatabase.Redologblocksarecorruptedingroup2，andarchivinghasstopped.Alltheredologsarefilledanddatabaseactivityishalted.Databasewriterhaswritteneverythingtodisk.Whichcommandwouldyouexecutetoproceedfurther？（）
单项选择题 Youareusingthefollowingcommandtoclearthelogfilegroup：ALTERDATABASECLEARLOFFILEGROUP2；Inwhichcasewouldthecommandbesuccessful？（）