You have just installed MySQL on Oracle Linux and adjusted your /etc/my.cnf parameters to suit your installation.
Examine the output:

What statement is true about the start attempt?

• A.MySQL server continued to start up even though another process existed.
• B.systemd found the mysqld service disabled and failed to start it.
• C.MySQL server was not started due to a problem while executing process 2732.
• D.systemd attempted to start mysqld, found another systemd mysqld process running, and shut it down.
• E.systemd waited for 30 seconds before timing out and start up failed.

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You have upgraded the MySQL binaries from 5.7.28 to 8.0.18 by using an in-place upgrade.
Examine the message sequence generated during the first start of MySQL 8.0.18:

Which step or set of steps will resolve the errors?

• A.Start mysqld again using the --upgrade=FORCE option.
• B.Execute: mysqlcheck --check-upgrade mysql columns_priv event proc proxies_priv tables_priv.
• C.Remove the redo logs. Replace the MySQL binaries with the 5.7.28 binaries. Prepare the tables for upgrade. Upgrade to 8.0.18 again.
• D.Go to the <datadir>/mysql directory and execute: myisamchk --update-state columns_priv event proc proxies_priv tables_priv.
• E.Execute: mysqlcheck --repair mysql columns_priv event proc proxies_priv tables_priv.

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You reconfigure and start a slave that was not replicating for several days.
The configuration file and CHANGE MASTERcommand are correct.
Examine the GTID information from both master and slave:

Which statement is true?

• A.Replication will fail because the slave has purged more aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa transactions than the master.
• B.Replication will fail because the master does not have the required transaction with bbbbbbbb-bbbb- bbbb-bbbb-bbbbbbbbbbbbGTIDs in its binary logs.
• C.Replication will fail because the master has already purged transactions with cccccccc-cccc-cccc- cccc-ccccccccccccGTIDs.
• D.Replication will fail because of inconsistent numbers in cccccccc-cccc-cccc-cccc-cccccccccccc GTIDs.
• E.Replication will work.

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A colleague complains about slow response time on your website.
Examine this query and output:

What is the most likely cause for the high number of lock waits?

• A.You use the MyISAM storage engine for most common tables.
• B.You use the InnoDB storage engine and statements wait while data is inserted.
• C.Your table accesses wait for the operating system level flush.
• D.The Innodb Buffer pool is full.

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Examine this command, which executes successfull
mysqlbackup --defaults-file=/backups/server-my.cnf --backup-dir=/backups/full copy-back Which statement is true about the copy-back process?

• A.It restores files from the backup directory to their original MySQL server locations.
• B.The copy-back process makes inconsistent backups.
• C.The copy-back process is used to overwrite a new backup over an existing backup.
• D.It restores files from the data directory to their original MySQL server locations.

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