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<strong>1Z0</strong>-<strong>148</strong> Q&As<br />
Oracle Database 12c: Advanced PL/SQL<br />
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QUESTION 1<br />
Examine the structure of the PRINT_MEDIA table: Name Null? Type<br />
ADVT_ID NUMBER ADVT_SOURCE CLOB Examine the following PL/SQL block:<br />
DECLARE<br />
lobloc CLOB;<br />
buffer VARCHAR2(100);<br />
amount NUMBER;<br />
offset NUMBER :=1;<br />
BEGIN<br />
buffer :=\\'This is the second line of a new document\\';<br />
amount := LENGTH(buffer);<br />
SELECT advt_source INTO lobloc FROM print_media WHERE advt_id=2 FOR UPDATE;<br />
DBMS_LOB.WRITE(lobloc,amount,offset,buffer);<br />
COMMIT;<br />
END;<br />
/<br />
What must be the value in the ADVT_SOURCE column for the above code to execute successfully?<br />
A. null<br />
B. an empty locator<br />
C. a non-NULL value<br />
D. either null or any non-NULL values<br />
Correct Answer: C<br />
QUESTION 2<br />
Which two statements about the PL/SQL hierarchical profiler are true?<br />
A. Access it using the DBMS_PROFILER package.<br />
B. Access it using the DBMS_HPROF package.<br />
C. Profiler data is recorded in tables <strong>and</strong> published in HTML reports.<br />
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D. It is only accessible after a grant of the CREATE PROFILE privilege.<br />
E. It helps you identify subprograms that are causing bottlenecks in application performance.<br />
Correct Answer: BE<br />
QUESTION 3<br />
Examine the structure of the TEXT_TAB table. Name Null? Type<br />
TEXT_ID NUMBER<br />
DOC1 CLOB<br />
DOC2 CLOB<br />
You issue the following INSERT comm<strong>and</strong>s:<br />
INSERT INTO text_tab VALUES (1, \\'This is line 1\\',null);<br />
INSERT INTO text_tab VALUES (2, \\'This is line 1\\',\\'This is line 2\\');<br />
Then you execute the following block of the PL/SQL code:<br />
DECLARE<br />
vc1 VARCHAR2(1000):= \\'This is the preface\\';<br />
lb1 CLOB;<br />
lb2 CLOB;<br />
BEGIN<br />
SELECT doc1 INTO lb1 FROM text_tab WHERE text_id=1;<br />
SELECT doc1 || doc2 INTO lb1 FROM text_tab WHERE text_id=2;<br />
lb2 := vc1|| lb1;<br />
UPDATE text_tab SET doc2 = lb2 WHERE text_id = 1;<br />
END;<br />
/<br />
What is the outcome?<br />
A. It executes successfully.<br />
B. It gives an error because VARCHAR2 should be explicitly converted to CLOB.<br />
C. It gives an error because CLOB variables should be initialized to EMPTY_CLOB().<br />
D. It gives an error because the concatenation operator cannot be used with the CLOB data type.<br />
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Correct Answer: A<br />
QUESTION 4<br />
Examine the structure of the TEST_DETAILS table: Name Null? Type<br />
TEST_ID NUMBER<br />
DESCRIPTION CLOB<br />
DESCRIPTION data was entered earlier <strong>and</strong> saved for TEST_ID 12.<br />
You execute this PL/SQL block to add data to the end of the existing data in the DESCRIPTION column for TEST_ID<br />
12:<br />
DECLARE<br />
clob_loc CLOB;<br />
buf CHAR(12);<br />
BEGIN<br />
SELECT description INTO clob_loc FROM test_details WHERE test_id = 12 ;<br />
buf := \\'0123456789\\';<br />
DBMS_LOB.WRITEAPPEND(clob_loc,DBMS_LOB.GETLENGTH(buf), buf);<br />
COMMIT;<br />
END;<br />
/<br />
It generates an error on execution.<br />
What correction should you do to achieve the required result?<br />
A. WRITEAPPEND must be replaced with APPEND.<br />
B. The BUF variable data type must be changed to CLOB.<br />
C. FOR UPDATE must be added to the SELECT statement.<br />
D. The GETLENGTH routine must be replaced with the LENGTH built-in function in WRITEAPPEND.<br />
Correct Answer: C<br />
QUESTION 5<br />
Which two are correct when migrating BasicFile LOBs to SecureFile LOBs by DBMS_REDEFINITION?<br />
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A. Online redefinition can be done only at the table level.<br />
B. Specify only BasicFiles LOB <strong>and</strong> SecureFiles LOB column names in parameter col_mapping of<br />
DBMS_REDEFINITION.START_REDEF_TABLE.<br />
C. Set the database initialization parameter db_securefile to NEVER.<br />
D. During migration, specify the NOLOGGING storage parameter for any new SecureFiles LOB columns.<br />
E. Online redefinition is the recommended method for migration of BasicFile LOBs to Secure LOBs.<br />
Correct Answer: BE<br />
QUESTION 6<br />
Which statements are true about temporary LOBs? (Choose all that apply.)<br />
A. They can be created only for CLOB <strong>and</strong> NCLOB data.<br />
B. They can be accessed only by the user who creates them.<br />
C. They generate more redo information than persistent LOBs.<br />
D. They exist for the duration of the session in which they are created.<br />
E. They are stored temporarily in the default tablespace of the user who creates them.<br />
Correct Answer: BD<br />
QUESTION 7<br />
Examine this code:<br />
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What is the correct statement to get the value of attribute ACCOUNT_MGR after the procedure has been executed?<br />
A. SELECT USERENV (`ACCOUNT_MGR\\') FROM dual;<br />
B. SELECT SYS_CONTEXT (`USERENV\\', `ACCOUNT_MGR\\') FROM dual;<br />
C. SELECT SYS_CONTEXT (`ORDER_CTX\\', `ACCOUNT_MGR\\') FROM dual;<br />
D. SELECT SYS_CONTEXT (`ACCOUNT_MGR\\', `ORDER_CTX\\') FROM dual;<br />
E. SELECT USERENV (`ORDER_CTX\\') FROM dual;<br />
Correct Answer: B<br />
QUESTION 8<br />
Which two statements are true about the tuning of PL/SQL code? (Choose two.)<br />
A. Redundant SQL statements in PL/SQL code should be avoided.<br />
B. Implicit data type conversion in PL/SQL code can improve performance.<br />
C. Usage of the NOT NULL constraint in PL/SQL code can degrade performance.<br />
D. If you have one PL/SQL program unit instead of multiple smaller executable sections, performance can be improved.<br />
Correct Answer: AC<br />
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QUESTION 9<br />
Identify three guidelines for the DBMS_ASSERT package. (Choose three.)<br />
A. Prefix all calls to DBMS_ASSERT with the SYS schema name.<br />
B. Embed DBMS_ASSERT verification routines inside the injectable string.<br />
C. Escape single quotes when you use the ENQUOTE_LITERAL procedure.<br />
D. Define <strong>and</strong> raise exceptions explicitly to h<strong>and</strong>le DBMS_ASSERT exceptions.<br />
E. Prefix all calls to DBMS_ASSERT with a schema name that owns the subprogram that uses the DBMS_ASSERT<br />
package.<br />
Correct Answer: ACD<br />
QUESTION 10<br />
Examine the following structure: SQL> DESCRIBE user_identifiers Name Null? Type<br />
NAME VARCHAR2(30)<br />
SIGNATURE VARCHAR2(32)<br />
TYPE VARCHAR2(18)<br />
OBJECT_NAME NOT NULL VARCHAR2(30)<br />
OBJECT_TYPE VARCHAR2(13)<br />
USAGE VARCHAR2(11)<br />
USAGE_ID NUMBER<br />
LINE NUMBER<br />
COL NUMBER<br />
USAGE_CONTEXT_ID NUMBER<br />
Identify two scenarios in which information is stored in the USAGE column. (Choose two.)<br />
A. an assignment made to VARIABLE<br />
B. declaration of a variable or formal parameter<br />
C. an identifier passed to a subprogram in IN OUT mode<br />
D. execution of the GOTO statement or raise of an exception<br />
Correct Answer: AB<br />
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