1Z1-888試験無料問題集「Oracle MySQL 5.7 Database Administrator 認定」
A MySQL server was initialized with separate UNDO tablespaces. Users complain that when they roll back large transactions, the time to process the request takes too long. The DBA would like to move the MySQL InnoDB UNDO tablespace to a solid-state drive (SSD) for better performance. Is this possible and how?
正解：D
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You have been tasked with creating a QA MySQL instance on a DB host, which already has one large instance in /var/lib/mysql/running as the mysqluser. The MySQL configuration file for the existing instance includes:
The default instance was installed using the OS package manager. The latest binaries for both client and server are already in ENV PATH.
The new instance will run as a different user from the existing instance for security purposes.
You create the new data directory successfully and move on to initialize the new DATADIR.
You verify the output to confirm the operation's success:
[mysqlQA@linux /var/lib/]$ mysqld --initialize --datadir=/var/lib/mysql_QA 2>&1 | tail -n3
2018-05-03T12:16:10.928809Z 0 [ERROR] Could not open file '/var/log/mysqld.log' for error logging:
Permission denied
2018-05-03T12:16:10.928841Z 0 [ERROR] Aborting
[mysqlQA@linux /var/lib/]$
The initialization of the instance has failed.
What would you do to enable the initialization to succeed?
The default instance was installed using the OS package manager. The latest binaries for both client and server are already in ENV PATH.
The new instance will run as a different user from the existing instance for security purposes.
You create the new data directory successfully and move on to initialize the new DATADIR.
You verify the output to confirm the operation's success:
[mysqlQA@linux /var/lib/]$ mysqld --initialize --datadir=/var/lib/mysql_QA 2>&1 | tail -n3
2018-05-03T12:16:10.928809Z 0 [ERROR] Could not open file '/var/log/mysqld.log' for error logging:
Permission denied
2018-05-03T12:16:10.928841Z 0 [ERROR] Aborting
[mysqlQA@linux /var/lib/]$
The initialization of the instance has failed.
What would you do to enable the initialization to succeed?
正解：A
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解説: (GoShiken メンバーにのみ表示されます)
You have a consistent InnoDB backup created with mysqldump, the largest table is 50 GB in size.
You start to restore your backup with this command;
shell> mysql -u root -p < backup.sql
After 30 minutes, you notice that the rate of restore seems to have slowed down. No other processes or external factors are affecting server performance.
Which is the most likely explanation for this slowdown?
You start to restore your backup with this command;
shell> mysql -u root -p < backup.sql
After 30 minutes, you notice that the rate of restore seems to have slowed down. No other processes or external factors are affecting server performance.
Which is the most likely explanation for this slowdown?
正解：E
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You have a MySQL instance running in a single cpu (1vCPU) VM in a shared infrastructure environment.
Your users are complaining that MySQL is sporadically slow and you have a suspicion that the VM infrastructure host is at fault due to resource contention.
You review the output of your scripts that monitor the database VM operating system during an extended period of slowdown.
What are the two most common indicators of the VM infrastructure host being at fault due to resource contention? (Choose two.)
Your users are complaining that MySQL is sporadically slow and you have a suspicion that the VM infrastructure host is at fault due to resource contention.
You review the output of your scripts that monitor the database VM operating system during an extended period of slowdown.
What are the two most common indicators of the VM infrastructure host being at fault due to resource contention? (Choose two.)
正解：A,C
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