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Oracle Database Administration I Sample Questions (Q154-Q159):

NEW QUESTION # 154
Which two statements are true about the rules of precedence for operators? (Choose two.)

A. The + binary operator has the highest precedence in an expression in a SQL statement
B. Arithmetic operators with equal precedence are evaluated from left to right within an expression
C. The concatenation operator | | is always evaluated before addition and subtraction in an expression
D. Multiple parentheses can be used to override the default precedence of operators in an expression
E. NULLS influence the precedence of operators in an expression

Answer: A,D

Explanation:
Explanation/Reference: https://docs.oracle.com/cd/B19306_01/server.102/b14200/operators001.htm

NEW QUESTION # 155
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 BOSTON_DB
B. as SCOTT in DALLAS_DB
C. as SYS in both the databases
D. as SCOTT in BOSTON_DB and SYS in DALLAS_DB
E. as SCOTT in both the databases

Answer: A

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 # 156
Which two statements are true about the PMON background process? (Choose two.)

A. It registers database services with all local and remote listeners known to the database instance
B. It frees unused temporary segments
C. It records checkpoint information in the control file
D. It frees resources held by abnormally terminated processes
E. It kills sessions that exceed idle time

Answer: D,E

Explanation:
Reference:
* Performs process recovery when a user process fails - Cleans up the database buffer cache - Frees resources that are used by the user process * Monitors sessions for idle session timeout

NEW QUESTION # 157
Which two statements are true about trace files produced by the Oracle Database server? (Choose two.)

A. They can be written by server processes
B. They can be written by background processes
C. Trace files are written to the Fast Recovery Area (FRA)
D. All trace files contain error information that require contacting Oracle Support
E. Trace file names are based on the database name concatenated with a sequential number

Answer: A,B

Explanation:
Reference:
https://docs.oracle.com/html/E25494_01/monitoring001.htm
Each server and background process can write to an associated trace file. When an internal error is detected by a process, it dumps information about the error to its trace file. Some of the information written to a trace file is intended for the database administrator, and other information is for Oracle Support Services. Trace file information is also used to tune applications and instances.

NEW QUESTION # 158
Which three statements are true about inner and outer joins? (Choose three.)

A. A full outer join must use Oracle syntax
B. A left or right outer join returns only unmatched rows
C. A full outer join returns matched and unmatched rows
D. Outer joins can be used when there are multiple join conditions on two tables
E. An inner join returns matched rows
F. Outer joins can only be used between two tables per query

Answer: C,D,E

NEW QUESTION # 159
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