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Download MySQL 8.0 Database Developer Exam Dumps
NEW QUESTION 51
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 1X4 ON Locations (site_id, loc_shared);
- 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 1X2 ON locations (loc_mapping) USING HASH; fH
- G. CREATE INDEX 1X3 ON locations <loc_site_id) ;
Answer: A,E
NEW QUESTION 52
Examine these my.cnf settings:
Examine this entry from /data/slow.log
Which option is also set in my.cnf?
- A. log__slow_admin_statements=1
- B. log_throttle_queries_not_using_indexes=100
- C. log_queries_not_using_indexes=ON
- D. log_queries_not_using_indexes
Answer: A
NEW QUESTION 53
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 CONCAT(last name,’, ‘,first_name) FROM employees;
- D. SELECT last_name + ‘, ‘ + first_name FROM employees;
- E. SELECT CONCAT_WS(‘, ‘,last_name,first_name) FROM employees;
Answer: C,E
NEW QUESTION 54
Which two are true about MySQL connectors?
- A. Connector/Python is released in precompiled binary and source code.
- B. Connector/J is based on Connector/C.
- C. Connector/NET runs on the Windows platform only.
- D. Connectors must be installed on both the client and server hosts.
- E. Connector/ODBC is available on Unix, Windows, and MacOS X.
Answer: B,D
NEW QUESTION 55
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. It returns an error because the CREATE TABLE statement automatically recreated the view.
- C. Existing emp_vuL is dropped and a new emp_vu1 created with the new definition.
- D. It returns an error because the DROP TABLE statement did not drop the view.
Answer: C
NEW QUESTION 56
……
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