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1Z0-148 Q&As 

Oracle Database 12c: Advanced PL/SQL 

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QUESTION 1 

Examine the structure of the PRINT_MEDIA table: Name Null? Type 

ADVT_ID NUMBER ADVT_SOURCE CLOB Examine the following PL/SQL block: 

DECLARE 

lobloc CLOB; 

buffer VARCHAR2(100); 

amount NUMBER; 

offset NUMBER :=1; 

BEGIN 

buffer :=\\'This is the second line of a new document\\'; 

amount := LENGTH(buffer); 

SELECT advt_source INTO lobloc FROM print_media WHERE advt_id=2 FOR UPDATE; 

DBMS_LOB.WRITE(lobloc,amount,offset,buffer); 

COMMIT; 

END; 

/ 

What must be the value in the ADVT_SOURCE column for the above code to execute successfully? 

A. null 

B. an empty locator 

C. a non-NULL value 

D. either null or any non-NULL values 

Correct Answer: C 

QUESTION 2 

Which two statements about the PL/SQL hierarchical profiler are true? 

A. Access it using the DBMS_PROFILER package. 

B. Access it using the DBMS_HPROF package. 

C. Profiler data is recorded in tables and published in HTML reports. 




D. It is only accessible after a grant of the CREATE PROFILE privilege. 

E. It helps you identify subprograms that are causing bottlenecks in application performance. 

Correct Answer: BE 

QUESTION 3 

Examine the structure of the TEXT_TAB table. Name Null? Type 

TEXT_ID NUMBER 

DOC1 CLOB 

DOC2 CLOB 

You issue the following INSERT commands: 

INSERT INTO text_tab VALUES (1, \\'This is line 1\\',null); 

INSERT INTO text_tab VALUES (2, \\'This is line 1\\',\\'This is line 2\\'); 

Then you execute the following block of the PL/SQL code: 

DECLARE 

vc1 VARCHAR2(1000):= \\'This is the preface\\'; 

lb1 CLOB; 

lb2 CLOB; 

BEGIN 

SELECT doc1 INTO lb1 FROM text_tab WHERE text_id=1; 

SELECT doc1 || doc2 INTO lb1 FROM text_tab WHERE text_id=2; 

lb2 := vc1|| lb1; 

UPDATE text_tab SET doc2 = lb2 WHERE text_id = 1; 

END; 

/ 

What is the outcome? 

A. It executes successfully. 

B. It gives an error because VARCHAR2 should be explicitly converted to CLOB. 

C. It gives an error because CLOB variables should be initialized to EMPTY_CLOB(). 

D. It gives an error because the concatenation operator cannot be used with the CLOB data type. 




Correct Answer: A 

QUESTION 4 

Examine the structure of the TEST_DETAILS table: Name Null? Type 

TEST_ID NUMBER 

DESCRIPTION CLOB 

DESCRIPTION data was entered earlier and saved for TEST_ID 12. 

You execute this PL/SQL block to add data to the end of the existing data in the DESCRIPTION column for TEST_ID 

12: 

DECLARE 

clob_loc CLOB; 

buf CHAR(12); 

BEGIN 

SELECT description INTO clob_loc FROM test_details WHERE test_id = 12 ; 

buf := \\'0123456789\\'; 

DBMS_LOB.WRITEAPPEND(clob_loc,DBMS_LOB.GETLENGTH(buf), buf); 

COMMIT; 

END; 

/ 

It generates an error on execution. 

What correction should you do to achieve the required result? 

A. WRITEAPPEND must be replaced with APPEND. 

B. The BUF variable data type must be changed to CLOB. 

C. FOR UPDATE must be added to the SELECT statement. 

D. The GETLENGTH routine must be replaced with the LENGTH built-in function in WRITEAPPEND. 

Correct Answer: C 

QUESTION 5 

Which two are correct when migrating BasicFile LOBs to SecureFile LOBs by DBMS_REDEFINITION? 




A. Online redefinition can be done only at the table level. 

B. Specify only BasicFiles LOB and SecureFiles LOB column names in parameter col_mapping of 

DBMS_REDEFINITION.START_REDEF_TABLE. 

C. Set the database initialization parameter db_securefile to NEVER. 

D. During migration, specify the NOLOGGING storage parameter for any new SecureFiles LOB columns. 

E. Online redefinition is the recommended method for migration of BasicFile LOBs to Secure LOBs. 

Correct Answer: BE 

QUESTION 6 

Which statements are true about temporary LOBs? (Choose all that apply.) 

A. They can be created only for CLOB and NCLOB data. 

B. They can be accessed only by the user who creates them. 

C. They generate more redo information than persistent LOBs. 

D. They exist for the duration of the session in which they are created. 

E. They are stored temporarily in the default tablespace of the user who creates them. 

Correct Answer: BD 

QUESTION 7 

Examine this code: 




What is the correct statement to get the value of attribute ACCOUNT_MGR after the procedure has been executed? 

A. SELECT USERENV (ÀCCOUNT_MGR\\') FROM dual; 

B. SELECT SYS_CONTEXT (ÙSERENV\\', ÀCCOUNT_MGR\\') FROM dual; 

C. SELECT SYS_CONTEXT (ÒRDER_CTX\\', ÀCCOUNT_MGR\\') FROM dual; 

D. SELECT SYS_CONTEXT (ÀCCOUNT_MGR\\', ÒRDER_CTX\\') FROM dual; 

E. SELECT USERENV (ÒRDER_CTX\\') FROM dual; 

Correct Answer: B 

QUESTION 8 

Which two statements are true about the tuning of PL/SQL code? (Choose two.) 

A. Redundant SQL statements in PL/SQL code should be avoided. 

B. Implicit data type conversion in PL/SQL code can improve performance. 

C. Usage of the NOT NULL constraint in PL/SQL code can degrade performance. 

D. If you have one PL/SQL program unit instead of multiple smaller executable sections, performance can be improved. 

Correct Answer: AC 




QUESTION 9 

Identify three guidelines for the DBMS_ASSERT package. (Choose three.) 

A. Prefix all calls to DBMS_ASSERT with the SYS schema name. 

B. Embed DBMS_ASSERT verification routines inside the injectable string. 

C. Escape single quotes when you use the ENQUOTE_LITERAL procedure. 

D. Define and raise exceptions explicitly to handle DBMS_ASSERT exceptions. 

E. Prefix all calls to DBMS_ASSERT with a schema name that owns the subprogram that uses the DBMS_ASSERT 

package. 

Correct Answer: ACD 

QUESTION 10 

Examine the following structure: SQL> DESCRIBE user_identifiers Name Null? Type 

NAME VARCHAR2(30) 

SIGNATURE VARCHAR2(32) 

TYPE VARCHAR2(18) 

OBJECT_NAME NOT NULL VARCHAR2(30) 

OBJECT_TYPE VARCHAR2(13) 

USAGE VARCHAR2(11) 

USAGE_ID NUMBER 

LINE NUMBER 

COL NUMBER 

USAGE_CONTEXT_ID NUMBER 

Identify two scenarios in which information is stored in the USAGE column. (Choose two.) 

A. an assignment made to VARIABLE 

B. declaration of a variable or formal parameter 

C. an identifier passed to a subprogram in IN OUT mode 

D. execution of the GOTO statement or raise of an exception 

Correct Answer: AB 




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