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Consider the join_buffer_size parameter in MySQL Server. Which two statements are true about the join buffer?

  • A. The value should be increased if the client performs several SELECT operations.
  • B. The join buffer is set per connection.
  • C. The join buffer is used to process sorts when complex joins are being performed.
  • D. The value should be increased from the default if the query joins large rows without using an index.
  • E. The join buffer is global and can be changed only by restarting the serve

Answer: CD

A MySQL replication slave is set up as follows: Uses all InnoDB tables
Receives ROW-based binary logs Has the read-only option
The replication slave has been found in an error state. You check the MySQL error log file and find these entries:
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What are two possible causes for this error to occur?

  • A. The applications have the SUPER privilege, which allows them to update rows.
  • B. The root user on the slave has executed FLUSH LOGS, causing the relay-log to doublewrite.
  • C. For tables with UNIQUE keys, statement-based replication must be used to maintain integrity.
  • D. The slave was created with mysqldump –u root –p --skip-lock-tables –all-databases > /data/datA.sql
  • E. The slave user does not have INSERT, UPDATE, or DELETE permission and cannot execute the Write_rows function.

Answer: CD

A simple master-to-slave replication is currently being used. This information is extracted from the SHOW SLAVE STATUS output:
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You execute a ‘SHOW CREATE TABLE mytable” on the slave:
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The table mytable on the slave contains:
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You have issued a STOP SLAVE command. You have determined that it is safe to skip the transaction in this case. One or more statements are required before you can issue a START SLAVE command to resolve the duplicate key error. Which statement should be used?

  • B. SET GTID_NEXT=”5da6b4f5-6f60-11e8-b2d6-0010e05f3e06:8”; BEGIN; COMMIT; SET GTID_NEXT=”AUTOMATIC”;
  • D. SET GLOBAL enforce_gtid_consistency=ON
  • E. SET GTID_EXECUTED=”5da6b4f5-6f60-11e8-b2d6-0010e05f3e06:8”;

Answer: C

When you examine a new MySQL installation with default configuration, you find a file called ibdata1 in the database directory. Which two statements are true about this file?

  • A. it contains the binary log.
  • B. it contains a general tablespace.
  • C. it is the default location for all new tables that you create.
  • D. it contains the system tablespace.
  • E. it contains the redo log.
  • F. it contains the undo lo

Answer: CD

There are multiple instances of MySQL Server running on a single OS that is backed up using the mysqlbackup command.
The /etc/my/cnf contains default values, for example, datadir=/var/lib/mysql/, with extra instances having their own separate my.cnf file (for example /etc/mysql/instanceN.cnf) overriding the defaults.
A restore of the second instance is attempted from the mysqlbackup archive using this command: mysqlbackup --backup-dir=/opt/backup/mysql/instance2 copy-back
Upon starting the second MySQL instance, you notice that the data does not match the expected backup. Which command-line option is required to successfully update the second instance?

  • A. --restore=2
  • B. --copy-back-from-log
  • C. --backup-instance=/var/lib/mysql/instance2
  • D. --instance=/var/lib/mysql/instance2
  • E. --defaults-file=/etc/mysql/instance2.cnf

Answer: E

A particular government’s security policy is to have very strict data encryption and safety settings. This is done by restricting access based on their own CA authority and limiting access to particular users within a department. Which method could be used to restrict access as required?

  • B. using GRANT USAGE, X509, …….ON *.* TO user@remotehost IDENTIFIED BY ‘secret_password’
  • C. using GRANT … REQUIRE SSL for a secure connection
  • D. using GRANT USAGE, SSL, …..ON *.* TO user@remotehost IDENTIFIED BY ‘secret_password’

Answer: A

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?

  • A. Ye
  • B. Shut down the mysqld process, enable the transportable_tablespace option, and move the UNDO directory to the SSD.
  • C. Ye
  • D. Shut down, copy the UNDO tablespaces to the new location, and change the innodb_undo_directory value in your my.cnf.
  • E. N
  • F. The UNDO tablespaces must remain on the same file system as the system tablespaces.
  • G. N
  • H. The sequential write pattern of the UNDO tablespaces is not supported on modern SSD block device

Answer: C

Consider that local disk files are accessible via MySQL with commands such as: mysql> LOAD DATA LOCAL INFILE ‘/etc/passwd’ INTO TABLE mypasswords; What change could be made to stop any breach via this insecurity?

  • A. executing REVOKE LOADFROM *.*
  • B. setting the --local-service=0 option when starting mysqld
  • C. executing REVOKEFILEFROM *_*
  • D. executing REVOKEFILE ON *_* FROM ‘ ‘@’%’
  • E. setting the --local-infile=0 option when starting mysqld
  • F. setting the --open-files-limit=0 option when starting mysqld

Answer: F

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 onl

Answer: AD

You want to create a temporary table named OLD_INVENTORY in the OLD_INVENTORY database on the master server. This table is not to be replicated to the slave server.
Which two changes would ensure that the temporary table does not propagate to the slave?

  • A. Set binlog_format=MIXED with the --replicate-ignore-temp-table option.
  • B. Use the --replicate-do-db, --replicate-do-table, or --replicate-wild-do-table option with the value equal to OLD_INVENTORY.
  • C. Change the binlog_format option to ROW and restart mysqld before you create the OLD_INVENTORY table.
  • D. Stop SQL_THREAD on the slave until you have finished using the OLD_INVENTORY temporary table.
  • E. Use the --replicate-ignore-table option with the value equal to OLD_INVENTORY.OLD_INVENTORY and restart mysqld before creating the temporary table.

Answer: BE

Which two statements describe how InnoDB recovery works?

  • A. InnoDB handles most crash recoveries automatically.
  • B. InnoDB blocks some operations when innodb_force_recovery is set to greater than 0.
  • C. There will in general be lost committed transactions after a crash using the default settings.
  • D. It is required to enable binlog_gtid_simple_recovery to perform a crash recovery.
  • E. It is recommended to set innodb_force_recovery = 1 as part of normal operations.
  • F. It is always required to enable innodb_force_recovery to perform a crash recover

Answer: BF

You will configure a MySQL Server to act as a replication master. Which two options must be configured correctly to allow this?

  • A. log-master-updates
  • B. rpl-recovery-rank
  • C. server-id
  • D. enable-master-start
  • E. log_bin
  • F. master-logging

Answer: CE

You are setting up a new installation of MySQL Server 5.7 (a GA release.) You have used a ZIP or TAR
package to ensure that the mysqld binary, along with its support files, such as plug-ins and error messages, now exist on the host. Assume that the default datadir exists on the host. You installed the binary in the default location (the default -- basedir value) for your operating system.
Which step should you perform before defining your own databases and database tables?

  • A. Execute a command with a minimal form of: mysql --initialize
  • B. Register mysqld as a service that will start automatically on this host machine.
  • C. Create a configuration file containing default-storage-engine=InnoDB.
  • D. Set an exception in the host machine’s firewall to allow external users to talk to mysqld.
  • E. Create additional login accounts (so that everyone does not need to log in as root) and assign them appropriate privileges.

Answer: C

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 explaine

Answer: D

Which are three facts about backups with mysqldump?

  • A. will lock all storage engines for duration of backup
  • B. can back up a remote database server
  • C. allow a consistent backup to be taken
  • D. are able to back up specific items within a database
  • E. create automatically compressed backups
  • F. are always faster to restore than binary backups

Answer: BCD

Which two statements are true regarding the creating of new MySQL physical and logical backups?

  • A. Physical backups can be used to recover from data corruption.
  • B. Logical backups are human-readable whereas physical backups are not.
  • C. Logical backups are always larger than physical backups.
  • D. Physical backups are usually slower than text backups.
  • E. Physical backups are usually faster than text backup

Answer: AE

Consider the table people with the definition:
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The application uses a query such as:
SELECT * FROM people WHERE YEAR(Birthday) = 1980;
The query is not using an index.
Which two methods can be used to allow the query to use an index?

  • A. Change the WHERE clause to Birthday BETWEEN 1980-01-01 AND 1980-12-31.
  • B. Add a functional index for YEAR(Birthday).
  • C. Execute ANALYZE TABLE to update the index statistics.
  • D. Add a generated column calculating YEAR(Birthday) and index that column.
  • E. Add FORCE INDEX (Birthday) to the quer

Answer: AE

You created a backup of the world database with this command: shell> mysqldump --opt world > dump.sql Which two will import the data from dump.sql?

  • A. shell> mysqladmin recover test dump.sql
  • B. shell> mysql test < dump.sql
  • C. shell> mysqlimport test dump.sql
  • D. mysql> USE test; mysql> LOAD DATA INFILE ‘dump.sql’;
  • E. mysql>USE test; mysql>SOURCE dump.sql;

Answer: CD

On a master server that is using statement-based replication, a table of log data has become very large. You decide to delete 100.000 rows.
Which two methods can be independently invoked to ensure that the delete is properly propagated to the slave? (Choose two.)

  • A. Change the replication mode to mixed before issuing any delete statements when the limit clause is used.
  • B. If the data modification is non-deterministic, the query optimizer will resolve any potential issues.
  • C. Use the limit clause to limit the deletion to 100.000 rows.
  • D. Use the limit clause in conjunction with the order 3Y claus

Answer: AD

You inherited a busy InnoDB OLTP Instance with 100 schemas and 100 active users per schema. Total dataset size is 200G with an average schema size G.
The data is transient and is not backed up and can be repopulated easily. Performance and responsiveness of the DB is paramount.
The query pattern for the DB instance is split 90/10 read/write. DB host is dedicated server with 256G RAM and 64 cores.
One of your colleagues made some recent changes to the system and users are now complaining of performance impacts. Which four configuration file edits might your colleague have performed to cause the negative DB performance?

  • A. table_open_cache = 64
  • B. innodb_buffer_pool_instances=64 innodb_buffer_pool_size=200G
  • C. log_bin=mysql –bin Innodb_flush_log_at_trx_commit=1
  • D. sync_binlog=10
  • E. innodb_flush_method=O_DIRECT
  • F. max_heap_table_size = 2G tmp_table_size=2G
  • G. query_cache_size = 2G query_cache_enabled=1
  • H. innodb_flush_log_at_trx_commit=0

Answer: ABEG


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