Free Access Oracle.1Z0-888.v2022-08-02.q167 Practice Test (Page 20)

Question 91

Consider:

Which statement best describes the meaning of the value for the key_len column?

A.It shows how many columns in the index are examined.

B.It shows the total size of the index row.

C.It shows the number of characters indexed in the key.

D.It shows how many bytes will be used from each index row.

Question 92

You have installed MySQL Server for the first time on your system. However, the data directory along with the tables in the mysqlsystem database are missing. Which step do you perform to create the contents of the data directory?

A.Run the create_system_tables.sqlfile

B.Run the mysql_unpack.sqlfile

C.Invoke mysqldwith the --initializeoption.

D.Invoke mysqlwith the --initializeoption.

Question 93

An employee cannot access the company database. You check the connection variables:

A look at the user privileges shows:

What is a valid explanation for why one of the users is unable to connect to the database?

A.connect_timeout is too small to allow a connection to occur.

B.Bob has max_user_connectionsset to zero, which blocks all his connections.

C.Kay is already connected elsewhere and attempting to log in again.

D.Joe has exceeded the max_user_connectionsglobal limit.

E.All users are blocked because max_user_connectionsis accumulated over the host account information.

Question 94

How does the InnoDB storage engine handle deadlocks when they are detected?

A.One of the affected transactions will be rolled back, the other is allowed to proceed.

B.The innodb_locks_unsafe_for_binlog setting determines which transaction is rolled back.

C.Both the affected transactions will be rolled back.

D.The affected transactions wait for innodb_lock_wait_timeout seconds, and then roll back.

E.The transaction isolation level determines which transaction is rolled back.

Question 95

Consider the table people with this definition:

The application uses a query such as:
SELECT * FROM people WHERE YEAR(Birthday) = 1980;
The query is not using an index.
Which two methods can be used to allow the query to use an index? (Choose two.)

A.Add FORCE INDEX (Birthday) to the query.

B.Add a functional index for YEAR(Birthday).

C.Change the WHERE clause to Birthday BETWEEN 1980-01-01 AND 1980-12-31.

D.Execute ANALYZE TABLE to update the index statistics.

E.Add a generated column calculating YEAR(Birthday) and index that column.

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Question 91

Question 92

Question 93

Question 94

Question 95

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