2018年OCP 052最新考试题库解析-20180608
题库新特点：
更加灵活，题库的顺序与考试时的顺序每场都在变化
更加考验知识点的掌握，题库答案为二，考试时要求选择最佳一个答案
整理：CUUG
1、Which three are true about undo segments and undo tablespaces in the same database and instance?
? A. Multiple transactions run by the same Oracle user can share a single undo segment. ? B. Multiple transactions run by different Oracle users can share a single undo segment. ? C. A serial transaction can use multiple undo segments.
? D. Undo segments are automatically dropped shortly after transactions that use them commit. ? E. A new undo segment is always created for each transaction. ? F. A database can have multiple undo tablespaces. ? Correct Answer: ABF
2、Which two are true about the Data Recovery Advisor?
? A. It can be used only for databases that are running in ARCHIVELOG mode. ? B. It can be used when the database is closed.
? C. It can be used to validate database recovery strategies. ? D. It provides intelligent database problem analysis. ? E. It can be used to validate database backup strategies.
? F. It can be used only for databases with FLASHBACK enabled. ? Correct Answer: CD
3、Which two are true about Oracle Data Pump in Oracle Database 11g Release 2?
? A. If the directory used in the export operation has existing dump files, it overwrites them. ? B. It allows encryption to be performed without using a password. ? C. It supports the renaming of tables during import. ? D. It supports the export of specific views as tables.
? E. It allows compression levels to be defined for the export. ? Correct Answer: BE
4、 For your ORCL database.
1. The instance is started using an spfile. 2. The database is opened. 3. It is in ARCHIVELOG mode.
4. CONTROL FILE AUTOBACKUP IS ON. Examine this command:
RMAN> backup as copy datafile ‘users01.dbf’,’example01.dbf’; Which four files are backed up? ? A. spfile
? B. undo01.dbf ? C. users01.dbf ? D. archivelogs ? E. sysaux01.dbf ? F. control file ? G. system01.dbf ? H. example01.dbf Correct Answer: ACFH
5、 When does an incremental checkpoint occur?
? A. when DBWn writes dirty buffers as part of its normal process ? B. when the alter system checkpoint statement is executed. ? C. when a user tablespace is taken offline ? D. when an online redo log switch occurs ? Correct Answer: A
6、 Examine this query and its output: SQL> select sid,event,blocking_session from v$session
where blocking_session is not null; SID EVENT BLOCKING_SESSION --- ----------------------------------- --------------------------- 105 enq:TX – row lock contention 15
Which two are true?
? A. The blocked session is waiting on a shared table lock. ? B. The blocked session is waiting on an enqueue. ? C. The blocking session is waiting on a row-level lock. ? D. Session 105 is blocked by session 15. ? E. Session 105 is blocking session 15. ? Correct Answer: BD
? 7、 In one of your databases:
1. USER1 and USER2 have no system privileges. 2. ROLE1 only has these privileges: * create session * create table * create view
Examine these commands: SQL> conn / as sysdba Connected
SQL> GRANT create table,role1 to user1 with admin option; grant successed
SQL> conn user1/oracle_4u Connected
SQL> GRANT role1 to user2; grant successed
7、Which command would you execute and as which user, to revoke the create table privilege from USER2?
? A. Revoke create table from user2 as user1 ? B. Revoke create table from user1 as sys ? C. Revoke create table from role1 as user1 ? D. Revoke create table from role1 as sys ? E. Revoke create table from user2 as sys ? Correct Answer: D
如果用user1回收角色的权限，会报错： SQL> revoke create session from role1; revoke create session from role1 *
ERROR at line 1:
ORA-01031: insufficient privileges
8、 Which two are true about server-generated alerts? ? A. Stateful alerts must always be cleared manually.