1z1-909 Exam Info and Free Practice Test All-in-One Exam Guide Mar-2023
Pass Oracle 1z1-909 Actual Free Exam Q&As Updated Dump Mar 04, 2023
Oracle 1z1-909 Exam Syllabus Topics:
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NEW QUESTION 33
You must write a statement that combines the first_name and last_name columns from the employees table as "last_name, first_name." Which two statements will do this?
- A. SELECT GROUP_CONCAT(last_name, first_name) FROM employees;
- B. SELECT last_name, ' , ',first_name FROM employees;
- C. SELECT last_name + ', ' + first_name FROM employees;
- D. SELECT CONCAT_WS(', ',last_name,first_name) FROM employees;
- E. SELECT CONCAT(last name,', ',first_name) FROM employees;
Answer: D,E
NEW QUESTION 34
Examine these statement which execute successfully:
Now, examine the statements executed in the mysqi command-line client:
What is true?
- A.
- B.
- C.
- D.
Answer: C
NEW QUESTION 35
Examine this statement which has executed successfully:
- A. The statement takes advantage of index description_idx.
- B. Execution performance can be improved by, using a composite index with column description as the leftmost prefix column description.
- C. Execution performance can be improved by using like instead of RLIKE.
- D. No index will improve statement performance.
- E. Execution performance can be improved by adding an index on column description.
Answer: C
NEW QUESTION 36
Examine these commands which execute successfully in the sequence shown in Sessions S1 and S2:
Now, examine this statement that execute successfully in s1:
S1> SELECT * FROM emp;
Which is true about the result of the select statement?
- A. The inserted row is returned because the isolation level is RPEATABLE READ in S1.
- B. The inserted row is not returned because the transaction still active in s2.
- C. The inserted row is not returned because the isolation level is READ COMMITTED in S2.
- D. The inserted row is returned because the transaction is auto committed in S2.
Answer: B
NEW QUESTION 37
What is an advantage of using mysqli in PHP programs rather than using PHP Data Objects (PDO)?
- A. mysqli includes X DevAPI functions.
- B. mysqli supports non blocking, asynchronous queries.
- C. mysqli can access databases from other vendors.
- D. mysqli supports object oriented programming.
Answer: D
NEW QUESTION 38
Examine these statements which execute successfully:
Which two changes will improve this query performance?
- A. CREATE INDEX 1X6 ON users (user_name);
- B. CREATE INDEX 1X3 ON locations <loc_site_id) ;
- C. CREATE INDEX 1X5 ON users (loc_id);
- D. CREATE INDEX IX1 ON locations (loc_shareci) ;
- E. CREATE INDEX 1X7 ON users (user_name) USING HASH;
- F. CREATE INDEX 1X4 ON Locations (site_id, loc_shared);
- G. CREATE INDEX 1X2 ON locations (loc_mapping) USING HASH; fH
Answer: A,E
NEW QUESTION 39
Examine the layout of the my_values table.
Examine the data in the my_value3 table.
Examine this statement:
A)
B)
D)
- A. Option B
- B. Option D
- C. Option A
- D. Option C
Answer: A
NEW QUESTION 40
Examine these commands and output:
Which is true?
- A. A new view is created because the previous was dropped on execution of the drop table statement.
- B. Existing emp_vuL is dropped and a new emp_vu1 created with the new definition.
- C. It returns an error because the DROP TABLE statement did not drop the view.
- D. It returns an error because the CREATE TABLE statement automatically recreated the view.
Answer: C
NEW QUESTION 41
The continent column in the country table contains no null values.
Examine this output:
A)
B)
C)
D)
- A. Option D
- B. Option C
- C. Option A
- D. Option B
Answer: C
NEW QUESTION 42
Examine the employee table structure:
Which set of statements immediately returns empname for a given emp_id by using a parameterized prepare statement?
A)
D)
- A. Option B
- B. Option D
- C. Option A
- D. Option C
Answer: A
NEW QUESTION 43
Examine these commands and output:
Which is true about the execution of the insert statement?
- A. It returns an error.
- B. It inserts a row in the view and base table.
- C. It inserts a new row in the view only.
- D. It inserts a new row in the base table only.
Answer: C
NEW QUESTION 44
You are using buffered queries with PHP mysqli in a browser-based web application. Which three are true?
- A. Buffered queries should be used on large tables when the result size is unknown.
- B. Buffered queries are enabled by default.
- C. Results are sent from the server to the browser for buffering.
- D. Large results can have a negative impact on performance.
- E. Buffered queries must be explicitly enabled using mysqliuseresult.
- F. Additional queries on the same session are blocked until the result set is released.
- G. Results are sent to the calling PHP process for buffering.
Answer: A,D,E
NEW QUESTION 45
Which two are true about indexes?
- A. Indexes contain rows sorted by key values.
- B. Indexing all of a table's columns improves performance.
- C. Indexes are used to enforce unique constraints.
- D. Indexes reduce disk space used.
- E. Secondary index access will always be faster than a table scan.
Answer: B,D
NEW QUESTION 46
Examine the contents of these tables:
Now examine the expected results for a user with privileges to access the table:
Which query returns the expected results?
A)
B)
C)
D)
- A. Option D
- B. Option C
- C. Option A
- D. Option B
Answer: C
NEW QUESTION 47
Examine the statement which executes successfully:
SET sql_mode=' NO_ENGINE_SUBSTITTJTION' ;
You try to create a table with a storage engine that is not available. What will happen?
- A. The server will create the table but report an error when the first attempt to insert a row is performed.
- B. The server will create the table but it will be unusable until the specified storage engine is available.
- C. The server will create the table using the default storage engine.
- D. An error occurs and the create table statement fails.
Answer: D
NEW QUESTION 48
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