100% Pass Quiz 2025 1Z0-909: Useful Free MySQL 8.0 Database Developer Brain Dumps

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Oracle MySQL 8.0 Database Developer Sample Questions (Q13-Q18):

NEW QUESTION # 13
You must reclaim memory used by a prepared statement named prep. Which two achieve this?

A. SET @prep = NULL;
B. DEALLOCATE PREPARE prep?
C. DROP PREPARE prep;
D. DROP PROCEDURE prep;
E. PREPARE prep FROM '';
F. SET @a = ''; EXECUTE prep USING @a;

Answer: A,D

NEW QUESTION # 14
Examine these commands which execute successfully:
mYsql> CREATE TABLE income (acct_num INT, amount DECIMAL(10,2));
mysql> CREATE TRIGGER subtotal BEFORE INSERT ON income
FOR EACH ROW SET @subtotal = subtotal + NEW.amount;
Which is true for the income table?

A. The trigger body set causes trigger activation.
B. Execution of an insert statement causes the trigger to activate.
C. The trigger activates after any row has been inserted into the table.
D. The trigger activates after any row in the table has been updated.

Answer: B

NEW QUESTION # 15
Examine this statement which has executed successfully:

A. The statement takes advantage of index description_idx.
B. Execution performance can be improved by using like instead of RLIKE.
C. Execution performance can be improved by adding an index on column description.
D. No index will improve statement performance.
E. Execution performance can be improved by, using a composite index with column description as the leftmost prefix column description.

Answer: E

NEW QUESTION # 16
Examine these statements issued from Session 1 which execute successfully:

Now, examine these statements issued from Session 2 which execute successfully:
Session 2>
BEGIN;
UPDATE band SET song=CONCAT ("Here Comes the ", song) WHERE song LIKE ' %Sun ; Which two are true?

A. Session 1 takes a shared lock on all the rows in the band table.
B. Session 1 must commit before the update in Session 2 can complete.
C. Session 2 does not start a transaction.
D. Session 2 takes an exclusive lock on all the rows in the band table.
E. Statements in Session 2 are committed.
F. Session 1 does not block Session 2.

Answer: B,E

NEW QUESTION # 17
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 not returned because the isolation level is READ COMMITTED in S2.
B. The inserted row is returned because the isolation level is RPEATABLE READ in S1.
C. The inserted row is not returned because the transaction still active in s2.
D. The inserted row is returned because the transaction is auto committed in S2.

Answer: C

NEW QUESTION # 18
......

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