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NEW QUESTION 1
One of your colleagues is trying to make a change using the mysql command-line client for his or her application session.
The colleague instant messages you this command: mysql> SET SESSION max_connections = 200; Why does the command fail?

  • A. max_connections requires the GLOBAL scope.
  • B. Its current user does not have the SUPER privilege.
  • C. max_connections is not a dynamic variabl
  • D. You need to change the config file and restart the database.
  • E. Users can control only the max_user_connections variabl

Answer: A

NEW QUESTION 2
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

NEW QUESTION 3
You have just executed a manual backup by using this command:
mysqlbackup –u root –p –-socket=/tmp/my.sock –-backup-dir=/my/backup/ backup The operation completed without error.
What is the state of this backup and operation required before it is ready to be restored?

  • A. Backup State = Compressed Backup Operation = copy-back
  • B. Backup State = Raw Backup Operation = apply-log
  • C. Backup State = Prepared Backup Operation = validate
  • D. Backup State = Prepared Backup Operation = apply-log
  • E. Backup State = Raw Backup Operation = backupdir-to-image

Answer: E

NEW QUESTION 4
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

NEW QUESTION 5
Which two methods accurately monitor the size of your total database size over time?

  • A. monitoring the Innodb_rows_inserted status variable
  • B. monitoring the innodb_redo_log_size variable
  • C. monitoring the information_schemA.TABLES table
  • D. monitoring datadir size in the operating system
  • E. monitoring cumulative Innodb_page_size increase
  • F. monitoring the performance_schema_hosts_size variable

Answer: CF

NEW QUESTION 6
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

NEW QUESTION 7
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?

  • A. SET GTID_NEXT=”CONSISTENCY”; BEGIN; COMMIT;SET GTID_NEXT=”AUTOMATIC”;
  • B. SET GTID_NEXT=”5da6b4f5-6f60-11e8-b2d6-0010e05f3e06:8”; BEGIN; COMMIT; SET GTID_NEXT=”AUTOMATIC”;
  • C. SET GLOBAL SQL_SKIP_SLAVE_COUNTER=1
  • D. SET GLOBAL enforce_gtid_consistency=ON
  • E. SET GTID_EXECUTED=”5da6b4f5-6f60-11e8-b2d6-0010e05f3e06:8”;

Answer: C

NEW QUESTION 8
Group Replication uses global transaction identifiers to track executed transactions and are fundamental in avoiding transaction conflict. Which additional three steps help in avoiding conflicts in group replication?

  • A. Set isolation level to be SERIALIZABLE.
  • B. Use the binary log row format.
  • C. Set isolation level to be READ COMMITTED.
  • D. Configure IPv6 network for hosts.
  • E. Guarantee a secondary index on every table.
  • F. Guarantee a primary key on every table.
  • G. Set multiple slave parallel worker thread

Answer: ABF

NEW QUESTION 9
Consider the index information for the dept_emp table in the employee’s schema:
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Which two conclusions can be made based on the output of the query?

  • A. There are three indexes on the table.
  • B. There is a redundant index on the dept_no column.
  • C. The secondary indexes are optimized for unique key look-ups.
  • D. The values on the emp_no column must be unique.
  • E. The selectivity of the dept_no column is the best of the indexed columns.
  • F. There is a redundant index on the emp_no colum

Answer: CF

NEW QUESTION 10
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 mysql 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 be reused.
  • C. You failed to specify the port number 3306 to the command to start the server, so it is defaulting to port 80, 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 still thinks there is an active server running.

Answer: E

NEW QUESTION 11
The MySQL error log shows:
InnoDB: Warning: a long semaphore wait:
The relevant parts of the InnoDB monitor output shows:
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Which two options would help avoid the long wait in the future?

  • A. Increase the value of the innodb_lock_wait_timeout option.
  • B. Increase the value of the innodb_read_io_threads option.
  • C. Change the table to use HASH indexes instead of BTREE indexes.
  • D. Set the value of innodb_adaptive_hash_index to zero.
  • E. Deactivate the query cache.
  • F. Increase the size of the InnoDB buffer poo

Answer: BF

NEW QUESTION 12
What is the best method for monitoring Group Replication conflict resolution?

  • A. the PERFORMANCE_SCHEMA tables
  • B. the SHOW PROCESSLIST command
  • C. the INNODB Lock Monitor details
  • D. the SHOW STATUS command
  • E. the INFORMATION_SCHEMA tables

Answer: A

NEW QUESTION 13
An existing master-slave setup is currently using a delayed replication of one hour. The master has crashed and the slave
must be “rolled forward” to provide all the latest datA. The SHOW SLAVE STATUS indicates these values: RELAY_LOG_FILE=hostname-relay-bin.00004 RELAY_LOG_POS=1383
Which command set would make the slave current?

  • A. STOP SLAVE; SET GLOBAL master_delay=0; START SLAVE;
  • B. STOP SLAVE; CHANGE MASTER TO RELAY_LOG_FILE = ‘hostname-relay-bin.00004’, RELAY_LOG_POS = 1383;
  • C. STOP SLAVE; CHANGE MASTER TO MASTER_DELAY=0; START SLAVE;
  • D. STOP SLAVE; CHANGE MASTER TO MASTER_DELAY=0; RELAY_LOG_FILE = ‘hostname-relay-bin.00004’, RELAY_LOG_POS = 1383;

Answer: C

NEW QUESTION 14
MySQL is installed on a Linux server and has this configuration:
[mysqld] user=mysql
datadir=/data/mysql/
As the ‘root’ user, you change the datadir location by executing:
shell> cp –R /var/lib/mysql /data/mysql/ shell> chown –R mysql /data/mysql
What is the purpose of changing ownership of datadir to the ‘mysql’ user?

  • A. MySQL needs to be run as the root user, but files cannot be owned by it.
  • B. The mysqld process requires all permissions within datadir to be the same.
  • C. MySQL cannot be run as the root user.
  • D. MySQL requires correct file ownership while remaining secur

Answer: A

NEW QUESTION 15
Which three are key advantages of standard MySQL replication?

  • A. supports native automatic failover
  • B. enables automatic resync of databases when discrepancies are detected
  • C. provides arbitrary geographic redundancy with minimal overhead to master
  • D. synchronously guarantees identical slave copy
  • E. is easy to configure and has low performance overhead
  • F. can easily add slaves for read scaling

Answer: BEF

NEW QUESTION 16
Force Majeure is a catastrophic failure on a major level of the database operation. Regular backups are key to helping avoid data loss in such situations.
Which two other steps can help avoid data loss in a major catastrophe?

  • A. Implement a failover strategy to another geographic location.
  • B. Create a master-master pair for each service.
  • C. Have a second data centre in a different region or country.
  • D. Keep software updated to the latest version.
  • E. Use RAID 10 storage for datA.
  • F. Use on-site network-attached storage to separate service from dat

Answer: AC

NEW QUESTION 17
Which three tasks are handled by the optimizer?

  • A. Decide which indexes to use.
  • B. Rewrite the WHERE clause.
  • C. Parse the query.
  • D. Change the order in which the tables are joined.
  • E. Validate the query.
  • F. Execute the query.
  • G. Verify that the user is allowed to execute the quer

Answer: BCF

NEW QUESTION 18
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?

  • A. using GRANT … REQUIRE X509 AND REQUIRE ISSUER ‘/C=…..’ AND REQUIRE SUBJECT ‘/C=…..’
  • 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

NEW QUESTION 19
Which two are considered good security practices when using passwords? (Choose two.)

  • A. Use one-way encryption for storage of passwords.
  • B. Store passwords external to the database.
  • C. Choose short passwords to save on storage space.
  • D. Use simple keyboard actions that give mixed letters.
  • E. Do not use dictionary-based word

Answer: AE

NEW QUESTION 20
You are using replication and the binary log files on your master server consume a lot of disk space. Which two steps should you perform to safely remove some of the older binary log files? (Choose two.)

  • A. Execute the PURGE BINARY LOGS NOT USED command.
  • B. Edit the .index file to remove the files you want to delete.
  • C. Ensure that none of the attached slaves are using any of the binary logs you want to delete.
  • D. Remove all of the binary log files that have a modification date earlier than today.
  • E. Use the command PURGE BINARY LOGS and specify a binary log file name or a date and time to remove unused files.

Answer: CE

Explanation:
A: To safely purge binary log files, follow this procedure:
1. On each slave server, use SHOW SLAVE STATUS to check which log file it is reading.
2. Obtain a listing of the binary log files on the master server with SHOW BINARY LOGS.
3. Determine the earliest log file among all the slaves. This is the target file. If all the slaves are up to date, this is the last log file on the list.
4. Make a backup of all the log files you are about to delete. (This step is optional, but always advisable.)
5. Purge all log files up to but not including the target file. Syntax:
PURGE { BINARY | MASTER } LOGS
{ TO ‘log_name’ | BEFORE datetime_expr }

NEW QUESTION 21
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

NEW QUESTION 22
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