Free Access Oracle.1Z1-888.v2022-09-10.q127 Practice Test (Page 20)

Question 91

Given these table definitions and the explain plan:

Which ALTER TABLE statement will improve the performance of the query?

A.ALTER TABLE `Country` ADD INDEX `idx_Code` (`Code`);

B.ALTER TABLE `CountryLanguage` ADD INDEX `idx_OffLang` (`IsOfficial`, `Language`);

C.ALTER TABLE `Country` ADD INDEX `idx_NameCont` (`Name`, `CountryCode`);

D.ALTER TABLE `CountryLanguage` ADD INDEX `idx_Lang` (`Language`);

Question 92

Consider the key buffer in a MySQL server. Which two statements are true about this feature?

A.It caches index blocks for MyISAM tables only.

B.It caches index blocks for all storage engine tables.

C.It is a global buffer.

D.It is set on a per-connection basis.

E.It caches index blocks for InnoDB tables only.

Question 93

This output is from a SHOW SLAVE STATUS:

What would cause the SQL_Delay variable to have a value of 360?

A.The slave was configured for delayed replication with a delay of six minutes.

B.The master has performed a large transaction, which will take 360 seconds to complete on the slave.

C.The slave will need an estimated 360 seconds to update the remaining contents from the relay log.

D.The network latency between the master and the slave is 360 milliseconds.

Question 94

A MySQL Server has been running an existing application successfully for six months. The my.cnf is adjusted to contain this additional configuration:

The MySQL Server is restarted without error.
What effect will the new configuration have on existing account?

A.They will have their passwords updated on start-up to sha256_password format.

B.They will have to change their password the next time they login to the server.

C.They are not affected by this configuration change.

D.They all connect via the secure sha256_password algorithm without any configuration change.

Question 95

An existing master-slave setup is currently using a delayed replication of one hour. The master has crashed and the slave must be "rolled forward" to provide all the latest data.
The SHOW SLAVE STATUS indicates these values:
* RELAY_LOG_FILE=hostname-relay-bin.00004
* RELAY_LOG_POS=1383
Which command set would make the slave current?

A.STOP SLAVE; CHANGE MASTER TO MASTER_DELAY=0; START SLAVE;

B.STOP SLAVE; CHANGE MASTER TO MASTER_DELAY=0; RELAY_LOG_FILE =
'hostname-relay-bin.00004', RELAY_LOG_POS = 1383;

C.STOP SLAVE; SET GLOBAL master_delay=0; START SLAVE;

D.STOP SLAVE; CHANGE MASTER TO RELAY_LOG_FILE =
'hostname-relay-bin.00004',RELAY_LOG_POS = 1383;

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Question 91

Question 92

Question 93

Question 94

Question 95

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