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Oracle Database Administration I Sample Questions (Q46-Q51):

NEW QUESTION # 46
The SCOTT/TIGER user exists in two databases, BOSTON_DB and DALLAS_DB, in two different locations.
Each database has a tnsnames.ora file defining DALLAS_DB as a service name.
Examine this command:
CREATE DATABASE LINK dblink1 CONNECT TO scott IDENTIFIED BY tiger USING 'dallas_db'; How do you execute the command so that only SCOTT in BOSTON_DB can access the SCOTT schema in DALLAS_DB?

A. as SCOTT in both the databases
B. as SCOTT in BOSTON_DB
C. as SCOTT in DALLAS_DB
D. as SYS in both the databases
E. as SCOTT in BOSTON_DB and SYS in DALLAS_DB

Answer: B

Explanation:
https://docs.oracle.com/cd/B28359_01/server.111/b28310/ds_concepts002.htm#ADMIN12085 Database links are either private or public. If they are private, then only the user who created the link has access; if they are public, then all database users have access.
https://docs.oracle.com/database/121/SQLRF/statements_5006.htm#SQLRF01205

NEW QUESTION # 47
View the Exhibits and examine the structure of the COSTS and PROMOTIONS tables.
You want to display PROD_IDS whose promotion cost is less than the highest cost PROD_ID in a promotion time interval.
Examine this SQL statement:

Exhibit 1.

Exhibit 2.

What will be the result?

A. It gives an error because the ALL keyword is not valid
B. It executes successfully but does not give the required result
C. It gives an error because the GROUP BY clause is not valid
D. It executes successfully and gives the required result

Answer: D

NEW QUESTION # 48
Examine these commands:

Which two statements are true about the sqlldrexecution? (Choose two.)

A. It uses the database buffer cache to load data
B. It generates a log that contains control file entries, which can be used with normal SQL*Loader operations
C. It generates a sql script that it uses to load data from EMP.DAT to EMP
D. It appends data from EMP.DAT to EMP
E. It overwrites data in EMP with data in EMP.DAT

Answer: A,C

NEW QUESTION # 49
In one of your databases, the user HR has the password HRMGR. You want to connect to a database instance whose listener listens on port 1531 by using this statement:
CONNECT HR/HRMGR@orcl
No name server is used.
Which statement is true about ORCL?

A. It must be the name of the database to whose instance HR wishes to connect
B. It must be the name of the server running the database to whose instance HR wishes to connect
C. It must resolve to a valid connect descriptor in the server's tnsnames.ora file
D. It must resolve to a valid connect descriptor in the client's tnsnames.ora file
E. It must be the value of the SERVICE_NAMES parameter on the client side

Answer: B

NEW QUESTION # 50
Which three statements are true about a self join? (Choose three.)

A. It must be an equijoin
B. The ON clause must be used
C. The ON clause can be used
D. The query must use two different aliases for the table
E. It must be an inner join
F. It can be an outer join

Answer: C,D,E

Explanation:
Explanation

NEW QUESTION # 51
......

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