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Frequently Asked 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.
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.
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.
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
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.
Question # 6
A single InnoDB table has been dropped by accident. You are unable to use an additional intermediate MySQL instance to restore the table. Which two backup methods can be used to restore the single table without stopping the MySQL instance? (Choose two.)
A. a backup created with mysqldump --all-databases
B. a backup created using FLUSH TABLES … FOR EXPORT
C. an up-to-date replication slave
D. a file system-level snapshot
E. a file system copy created while MySQL was shut down.
Question # 7
Suppose you are adding rows to a MyISAM table and the --datadir location runs out of disk space. What will happen when this occurs?
A. The server will crash.
B. The server suspends that INSERT operation until space becomes available.
C. An error message will be returned to the client .Server Error: ER_IO
D. The server suspends operations for all storage engines until space becomes available.
Question # 8
After rebooting the host, you attempt to start the mysqld service.You get the following error: Can’t start the server:Bind on TCP/IP port: Address already in use What is the most likely cause of this error?
A. The mysqld service has already been started on the same port.
B. The network service process in the server is frozen, so all TCP/IP connections are paused and cannot bereused.
C. You failed to specify the port number 3306 to the command to start the server, so it is defaulting to port80, which is in use by the built-in web server.
D. The /etc/hosts file does not have a valid IP entry for mysqld localhost, so it is binding to 127.0.0.1,which is already in use.
E. The mysql.sock file in the MySQL /tmp directory was not removed after the reboot, so mysqld stillthinks there is an active server running.
Question # 9
While attempting to set up a new replication slave on host ‘192.168.0.25’ with the user ‘replication’, you encounter this error:What should you do to resolve this error?
A. Add the user replication@192.168.0.25 with the correct password to the master.
B.Edit the DNS table on the master to include the domain name for the IP address of 192.168.0.25.
C. Edit the my.ini file on the slave so that the master-host variable is equal to the IP address of the master,and restart the slave.
D.Add the user replication@192.168.0.25 with the correct password to the slave.
Question # 10
A master-slave replication setup has the slave showing this error:On the master server, the binary logs show:What could explain this error? (Choose two.)
A. binlog_cache_size=1024 is too small and transactions are lost.
B. binlog_format=STATEMENT and a non-deterministic query was executed.
C. enforce_gtid_consistency=ON and consistency is broken between the master and the slave.
D. The sync_relay_log=1000 setting on the slave is too small.
E. sync_binlog=0 and the master server crashed.
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