Examination subjects ：1Z0-082
Examination questions ：90
Through the score ：60%
Official examination instructions ：https://education.oracle.com/ Product catalog -ouexam-pexam_1z0-082/pexam_1Z0-082

1.Which two statements are true about space-saving features in an Oracle Database?
A.An index created with the UNUSABLE attribute has no segment.
B.Private Temporary Tables(PTTs) store metadata in memory only.
C.Private Temporary Tables(PTTs) when used, are always dropped at the next commit statement. D.An index that is altered to be UNUSABLE will retain its segment
E. A table that is truncated will always have all of its extents removed
answer ：AB
https://docs.oracle.com/en/database/oracle/oracle-database/18/admin/managing-tables.html#GUID-8A4441BC-9B9E-46AA-9CEE-D825440F34C7

After testing ,truncate table Initial extent Does not delete .
After testing alter index in_a unusable; Will delete all segment.

2.Which two statements are true about views?
A.A view must only refer to tables in its defining query.
B.The WITH CHECK clause prevents certain rows from being displayed when querying the view C.Views can be updated without the need to re-grant privileges on the view
D.The WITH CHECK clause prevents certain rows from being updated or inserted in the underlying table through the view.
E.Views can be indexed
answer ：CD
a You can also use views

3.Examine the description of the products table

A.SELECT prod_id, AVG(MAX (cost)) FROM products GROUP BY prod_id.
B.SELECT prod_id, MAX (AVG (cost)) FROM products GROUP BY prod_id:
C.Select prod_id, release_date, SUM(cost) FROM products GROUP BY prod_id
D.SELECT prod_id, release_date, SUM(cost) FROM products GROUP BY prod_id, release_date
answer ：D
Columns that do not appear in the grouping function must appear in group by clause

4.You currently have an active transaction in your session and have been granted select access to V$TRANSACTION

In which three situations will re-executing this query still return a row but with a different XID indicating a new transaction has started?
A.after successfully executing a TRUNCATE statement followed by a DML statement
B.after successfully executing a CREATE TABLE AS Select statement followed by a SELECT FOR UPDATE statement
C.after successfully executing a CREATE TABLE statement followed by a CREATE INDEX statement
D.after successfully executing a commit or ROLLBACK followed by a DML statement
E.after successfully executing a DML statement following a failed DML statement
F. after successfully executing a commit or ROLLBACK followed by a Select statement
answer ：ABD
F This business will end , But it will not start a new transaction .
Followed by Meaning and followed contrary

5.Which two statements are true about the PMON background process?
A.It rolls back transactions when a process fails
B.It registers database services with all local and remote listeners known to the database instance
C.It frees unused temporary segments
D.It frees resources held by abnormally terminated processes
E.It records checkpoint information in the control file
answer ：AD
Register database service to monitor , Polling every 60 second （12c After that, the work was carried out by LRRG Process responsible ）

6.Examine the description of the BOOKS_TRANSACTIONS table:

Which two WHERE conditions give the same result?
A.WHERE borrowed_date= SYSDATE AND (transaction_ type =‘RM’ AND (member_id=‘A101’ OR member_id =‘A102’ ))
B.WHERE borrowed_date= SYSDATE AND (transaction type=‘RM’ OR member_id IN (‘A101’, ‘A102’))
C.WHERE borrowed_date= SYSDATE AND (transaction type =‘RM’ AND member_id ‘A101’ OR member id =‘A102’)
D.WHERE borrowed_date= SYSDATE AND transaction type =‘RM’ OR member id IN

(‘A101’, ‘A102’)
E.WHERE (borrowed date= SYSDATE AND transaction type =‘RM’) OR member id IN A101’,'A1021)
answer ：DE

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