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Sample Questions

Question 1

This output is from a SHOW SLAVE STATUS:What would cause the SQL_Delay variable to have a value of 360?

A. The master has performed a large transaction, which will take 360 seconds to complete on the slave.
B. The network latency between the master and the slave is 360 milliseconds.
C. The slave will need an estimated 360 seconds to update the remaining contents from the relay log.
D. The slave was configured for delayed replication with a delay of six minutes.

Answer: D

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Question 2

You are no longer able to log in to an existing MySQL Server because the root password credentials not working.You need to reset the root password to complete various administrative tasks.What are the two major methods that will achieve this?(Choose two.) 

A.  Start the MySQL Server in --safe-mode, which only loads the privilege system for changes as data isinaccessible.
B. Start the MySQL Server with reset-root-password in my.cnf, which will prompt you to enter a new rootuser password.
C. Start the MySQL Server with --init-file pointing to SQL that executes an ALTER USER statement tochange the root user password.
D. Start the MySQL Server with --skip-grant-tables and execute SQL, which will update the root password.
E. Start the MySQL Server with –initialize-insecure to force a password reset procedure on the commandline.

Answer: C,D

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Question 3

You are investigating the performance of the server and see this information: events_waits_summary_global_by_event_name in the Performance Schema shows that the wait/synch/mutex/sql/LOCK_table_cache event is dominating other wait events.The Table_open_cache_overflows status variable is 0. Which action should be taken to remove the performance bottleneck described here?

A. Increase the value of table_open_cache_instances.
B. Decrease the value of table_definition_cache.
C. Decrease the value of table_open_cache.
D. Increase the value of table_definition_cache.
E. Increase the value of table_open_cache.
F. Decrease the value of table_open_cache instances.

Answer: A

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Question 4

You have forgotten the root user account password. You decide to reset the password and execute: Which additional argument makes this operation safer?

A. –-old-passwords, to start MySQL to use the old password format while running without the grant tables.
B. –-reset-grant-tables, to start the server with only the mysql database accessible.
C. –-read-only, to set all data to read-only except for super users
D. –-skip-networking, to prohibit access from remote locations

Answer: D

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Question 5

What is the order of tables shown in an EXPLAIN output?

A. It lists tables from the smallest to the largest.
B. It lists tables in the order in which their data will be read.
C. It lists tables from the most optimized to the least optimized.
D. It lists tables in the order in which they are specified in the statement that is being explained.

Answer: D

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