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Total 84 questions Full Exam Access

Question 1

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:
1Z0-888 dumps exhibit

What are two possible causes for this error to occur?

The applications have the SUPER privilege, which allows them to update rows.

The root user on the slave has executed FLUSH LOGS, causing the relay-log to doublewrite.

For tables with UNIQUE keys, statement-based replication must be used to maintain integrity.

The slave was created with mysqldump –u root –p --skip-lock-tables –all-databases > /data/datA.sql

The slave user does not have INSERT, UPDATE, or DELETE permission and cannot execute the Write_rows function.

Question 2

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?

STOP SLAVE; SET GLOBAL master_delay=0; START SLAVE;

STOP SLAVE; CHANGE MASTER TO RELAY_LOG_FILE = ‘hostname-relay-bin.00004’, RELAY_LOG_POS = 1383;

STOP SLAVE; CHANGE MASTER TO MASTER_DELAY=0; START SLAVE;

STOP SLAVE; CHANGE MASTER TO MASTER_DELAY=0; RELAY_LOG_FILE = ‘hostname-relay-bin.00004’, RELAY_LOG_POS = 1383;

Question 3

What are three methods to reduce MySQL server exposure to remote connections? (Choose three.)

using SSL when transporting data over remote networks

using the sql_mode=STRlCT_SECURE after connections are established for encrypted communications

setting —skip-networking when remote connections are not required

setting specific grant privileges to limit remote authentication

setting —mysql_secure_configuration to enable paranoid mode

Question 4

Consider the key buffer in a MySQL server. Which two statements are true about this feature?

It caches index blocks for MyISAM tables only.

It caches index blocks for all storage engine tables.

It is a global buffer.

It is set on a per-connection basis.

It caches index blocks for InnoDB tables onl

Question 5

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?

table_open_cache = 64

innodb_buffer_pool_instances=64 innodb_buffer_pool_size=200G

log_bin=mysql –bin Innodb_flush_log_at_trx_commit=1

sync_binlog=10

innodb_flush_method=O_DIRECT

max_heap_table_size = 2G tmp_table_size=2G

query_cache_size = 2G query_cache_enabled=1

innodb_flush_log_at_trx_commit=0

Question 6

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

log-master-updates

rpl-recovery-rank

server-id

enable-master-start

log_bin

master-logging

Question 7

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.)

Change the replication mode to mixed before issuing any delete statements when the limit clause is used.

If the data modification is non-deterministic, the query optimizer will resolve any potential issues.

Use the limit clause to limit the deletion to 100.000 rows.

Use the limit clause in conjunction with the order 3Y claus

Question 8

You have installed MySQL Server for the first time on your system. However, the data directory along with the tables in the mysql system database are missing. Which step do you perform to create the contents of the data directory?

Run the create_system_tables.sql file

Run the mysql_unpack.sql file

Invoke mysqld with the --initialize option.

Invoke mysql with the --initialize optio

Question 9

You are using the Performance Schema to investigate replication on a slave which has a single master. The option slave- parallel-type is set to DATABASE.
1Z0-888 dumps exhibit

Assume that all instruments and consumers are enabled and all threads are instrumented. Which two facts can be concluded from the given output?

The salve has two intermediate relay slaves connected to it.

The slave is configured with slave_parallel_workers = 4

At most, two schemas are being updates concurrently.

THREAD_ID 21 has stopped running.

The slave cannot process the relay log fast enough to use all threads.

The server needs more cores to use all slave thread

Question 10

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?

MySQL needs to be run as the root user, but files cannot be owned by it.

The mysqld process requires all permissions within datadir to be the same.

MySQL cannot be run as the root user.

MySQL requires correct file ownership while remaining secur

Question 11

Consider the table people with the definition:
1Z0-888 dumps exhibit

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?

Change the WHERE clause to Birthday BETWEEN 1980-01-01 AND 1980-12-31.

Add a functional index for YEAR(Birthday).

Execute ANALYZE TABLE to update the index statistics.

Add a generated column calculating YEAR(Birthday) and index that column.

Add FORCE INDEX (Birthday) to the quer

Question 12

You enable binary logging on MySQL Server with the configuration: binlog-format=STATEMENT log-bin
Which database updates are logged on the master server to the binary log by default?

all updates except to the TEMPDB database

all updates except to the PERFORMANCE_SCHEMA database

all updates not involving temporary tables

all updates to the default database, except temporary tables

all updates to all databases

Question 13

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?

The mysql service has already been started on the same port.

The network service process in the server is frozen, so all TCP/IP connections are paused and cannot be reused.

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.

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.

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.

Question 14

Consider the CHECK TABLE command.
In which two situations should this command be used? (Choose two.)

to find out why a query takes a long time to execute on a given table

to make sure a table has no structural problems

to improve performance by updating index distributing statistics on InnoDB tables

to repair table structure problem

to make sure that no table indexes are corrupted

Question 15

Which two options describe how MySQL Server allocates memory?

Each connection may have its own per-thread memory allocations.

Thread memory is pre-allocated up to thread_cache_size for performance.

Each thread allocates memory from a global pool.

Global memory resources are allocated at server startu

Question 16

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?

a backup created with mysqldump --all-databases

a backup created using FLUSH TABLES … FOR EXPORT

an up-to-date replication slave

a file system-level snapshot

a file system copy created while MySQL was shut dow

Question 17

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?

Start the MySQL Server in --safe-mode, which only loads the privilege system for changes as data is inaccessible.

Start the MySQL Server with reset-root-password in my.cnf, which will prompt you to enter a new root user password.

Start the MySQL Server with --init-file pointing to SQL that executes an ALTER USER statement to change the root user password.

Start the MySQL Server with --skip-grant-tables and execute SQL, which will update the root password.

Start the MySQL Server with –initialize-insecure to force a password reset procedure on the command lin

Question 18

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?

--restore=2

--copy-back-from-log

--backup-instance=/var/lib/mysql/instance2

--instance=/var/lib/mysql/instance2

--defaults-file=/etc/mysql/instance2.cnf

Question 19

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?

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

using GRANT USAGE, X509, …….ON *.* TO user@remotehost IDENTIFIED BY ‘secret_password’

using GRANT … REQUIRE SSL for a secure connection

using GRANT USAGE, SSL, …..ON *.* TO user@remotehost IDENTIFIED BY ‘secret_password’

Question 20

You back up by using mysqldump.
Which configuration is required on the MySQL Server to allow point-in-time recovery?

binlog_format=STATEMENT

log-bin

apply-log

bonlog_format=ROW

gtid_enable

Question 21

The MySQL installation includes the mysql_config_editor utility for managing login paths stored in a
.mylogin.cnf file.
Which two are true about the login path feature?

mysql_config_editor is the only MySQL-provided utility that can print the values stored in.mylogin.cnf.

A .mylogin.cnf file can store at most one login path.

It provides a FIPS-compliant keyring for storing MySQL login details.

A .mylogin.cnf file can be edited using a text editor, such as vim or Notepad++.

It is an alternative to storing the MySQL login details in a my.cnf file.

It provides means to help avoid accidentally exposing the MySQL login detail

Question 22

You are contacted by a user who does not have permission to access a database table. You determine after investigation that this user should be permitted to have access and so you execute a GRANT statement to enable the user to access the table.
Which statement describes the activation of that access for the user?

The access does not take effect until the user logs out and back in.

The access does not take effect until the next time the server is started.

The access is available immediately.

The access does not take effect until you issue the FLUSH PRIVILEGES statemen

Question 23

A simple master-to-slave replication is currently being used. This information is extracted from the SHOW SLAVE STATUS output:
1Z0-888 dumps exhibit

You execute a ‘SHOW CREATE TABLE mytable” on the slave:
1Z0-888 dumps exhibit

The table mytable on the slave contains:
1Z0-888 dumps exhibit

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?

SET GTID_NEXT=”CONSISTENCY”; BEGIN; COMMIT;SET GTID_NEXT=”AUTOMATIC”;

SET GTID_NEXT=”5da6b4f5-6f60-11e8-b2d6-0010e05f3e06:8”; BEGIN; COMMIT; SET GTID_NEXT=”AUTOMATIC”;

SET GLOBAL SQL_SKIP_SLAVE_COUNTER=1

SET GLOBAL enforce_gtid_consistency=ON

SET GTID_EXECUTED=”5da6b4f5-6f60-11e8-b2d6-0010e05f3e06:8”;

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Total 84 questions Full Exam Access