多项选择题

You are in the middle of a transaction and very crucial data has been modified. Because of a hardware failure， the instance has shut down before synchronizing all the database files. Which two statements are true？（）

A.On startup， SMON coordinates instance recovery.
B.On startup， CKPT coordinates instance recovery.
C.On startup， use RMAN to perform instance recovery.
D.Uncommitted changes will be rolled back after the database is opened.
E.On startup， perform media recovery and then instance recovery.
F.On startup， all the files will be synchronized and you get both committed and uncommitted data.

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热门试题

单项选择题Oneoftheusersessionswasterminatedabnormallyinthemiddleofatransaction.WhatdoesOracledatabasedotorecoverit？（）

A.uses undo data for roll forward
B.uses Flashback Log for recovery
C.uses online redo logs to roll back
D.uses undo data to roll back the transaction
E.uses Recovery Manager （RMAN） to roll back
F.uses the System Monitor （SMON） background process to perform instance recovery

单项选择题Initially， for the Automatic Workload Repository （AWR） statistics， the retention period is set to 7 days， the collection interval is set to 30 minutes and the collection level is set to Typical in your production database. You have been using the Memory Advisor for the last three months to generate recommendations for tuning memory components. However， when you observe the Memory Advisor on a Friday， you find that the statistics are available only for two days， Thursday and Friday， of that week. What would have caused the statistics to be removed？（）

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？（）

A.The tablespace TBS1 is full.
B.The user is not the owner of the SYSTEM tablespace.
C.The user does not have quota on the TBS1 tablespace.
D.The user does not have sufficient system privileges to create table in the TBS1 tablespace.
E.The user does not have sufficient privileges to create table on the default permanent tablespace.

单项选择题Redologfilesarenotmultiplexedinyourdatabase.Redologblocksarecorruptedingroup2，andarchivinghasstopped.Alltheredologsarefilledanddatabaseactivityishalted.Databasewriterhaswritteneverythingtodisk.Whichcommandwouldyouexecutetoproceedfurther？（）

A.RECOVER LOGFILE BLOCK GROUP 2；
B.ALTER DATABASE DROP LOGFILE GROUP 2；
C.ALTER DATABASE CLEAR LOGFILE GROUP 2；
D.ALTER DATABASE RECOVER LOGFILE GROUP 2；
E.ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 2；

单项选择题Youareusingthefollowingcommandtoclearthelogfilegroup：ALTERDATABASECLEARLOFFILEGROUP2；Inwhichcasewouldthecommandbesuccessful？（）

A.Group 2 is the active group.
B.Group 2 is the current group.
C.Database is in the MOUNT state.
D.Group 2 has been already archived.