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Oracle MySQL 8.0 Database Developer Sample Questions (Q52-Q57):

NEW QUESTION # 52
Which statement is true about the show errors command?

• A. It cannot display information for more than maxerrotcount server system variable setting.
• B. It displays similar diagnostics results as get diagnostics.
• C. It displays the total number of errors, warnings, and notes since the server last restarted.
• D. It displays errors messages only, since the server last restarted.
• E. It displays the total number of errors, warnings, and notes since the beginning of the current session.
• F. It displays errors messages only, since the start time of the current session.

Answer: E
NEW QUESTION # 53
Examine this statement and output:
CREATE TABLE geom (g GEOMETRY NOT NOLL, SPATIAL INDEX(g) ) ; Query OK, 0 rows affected, 1 warning (0.01 sec) An attempt is made to add an SRID attribute to the column using the statement:
ALTER TABLE geom MODIFY COLUMN g geometry NOT NULL SRID 0;
Which is true?

• A. An error is generated because srid o is an invalid identifier value.
• B. Execution succeeds with a warning.
• C. Execution succeeds and allows the use of the index by the optimizer.
• D. An error is generated because the index prevents changes to the column.

Answer: D
NEW QUESTION # 54
Examine the Test.php script which is numbered for clarity, and its output:

PHP Fatal error: Uncaught Error: call to underined function mysqli_connect () in Test.php:2 Which action will fix this error?

• A. Install the PHP executable in the path used by the MySQL installation.
• B. Replace line 2 With: Slink = mysql_xdevapi\getSession
  ("mysqlx://username:[email protected]:3306","schema");
• C. Replace line 2 with Slink = mysql.connect {"localhost: 3306n, "username", "pas "schema") ;
• D. Enable the mysqli extension in the php.ini file.

Answer: B
NEW QUESTION # 55
Which change will prevent negative ages to be inserted into the people table?

• A. DELIMITER //
  CREATE TRIGGER age check AFTER INSERT ON people FOR EACH ROW IF NEW. age < 0 THEN SET NEW.age =0; END IF;// DELIMITER;
• B. DELIMITER //
  CREATE TRIGGER agecheck BEFORE INSERT ON people FOR EACH ROW IF NEW. age < 0 THEN SET NEW.age =0; END IF;// DELIMITER ;
• C. ALTER TABLE people ADD COLUMN validage=ABS(checkage) GENERATED ALWAYS;
• D. ALTER TABLE people ADD CONSTRAINT check_age CHECK (ABS(age)>=0);

Answer: D
NEW QUESTION # 56
Examine this statement which has executed successfully:

• A. No index will improve statement performance.
• 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. Execution performance can be improved by adding an index on column description.
• E. The statement takes advantage of index description_idx.

Answer: B
NEW QUESTION # 57
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