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Download MySQL 8.0 Database Developer Exam Dumps

NEW QUESTION 21
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 transaction still active in s2.
• B. The inserted row is not returned because the isolation level is READ COMMITTED in S2.
• C. The inserted row is returned because the isolation level is RPEATABLE READ in S1.
• D. The inserted row is returned because the transaction is auto committed in S2.

Answer: A

NEW QUESTION 22
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 it will be unusable until the specified storage engine is available.
• B. An error occurs and the create table statement fails.
• C. The server will create the table but report an error when the first attempt to insert a row is performed.
• D. The server will create the table using the default storage engine.

Answer: B

NEW QUESTION 23
Which two are true about MySQL Document Store?

• A. It helps to store data items in a schema-less key-value store.
• B. It allows one to bypass the SQL layer of the server.
• C. There is no access to relational tables.
• D. It can store documents greater than 4 GB.
• E. It depends heavily on strictly typed data.

Answer: A,B

NEW QUESTION 24
Examine the appointments table definition which contains one million rows:

Now, examine this statement which executes successfully:

Which statement will improve query performance?

• A. ALTER TABLE appointments add index IX_4<attendant_id, payment, credit)
• B. ALTER TABLE appointments add index IX_2(attendant_session_id, created_by)
• C. ALTER TABLE appointments add index IX_1(credit,payment)
• D. ALTER TABLE appointments add index IX_3(attendant_id, created_by)

Answer: A

NEW QUESTION 25
The collection col contains all episodes for all seasons for a TV show.
Examine this document which has an example of the details for each episode:

Which query returns all expisode names from the first season?

• A. SELECT name FROM col WHERE season = 1;
• B. SELECT "S.name" FROM col WHERE "S.season" = "1";
• C. SELECT doc->"$.name" FROM col WHERE doc->"$.season" = "1";
• D. SELECT doc->,$.name,, FROM col WHERE doc->"$ . season" = "1";

Answer: B

NEW QUESTION 26
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