Lead4Pass 1Z0-908 Exam Dumps Real 1Z0-908 Exam Study Guide – Jan 2023
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Question 1:
Examine this statement, which executes successfully:
You want to improve the performance of this query:
Which change enables the query to succeed while accessing fewer rows?
A. ALTER TABLE world. city ADD SPATIAL INDEX (Name);
B. ALTER TABLE world. city ADD SPATIAL INDEX (Population);
C. ALTER TABLE world. city ADD INDEX (Population);
D. ALTER TABLE world. city ADD INDEX (Name);
E. ALTER TABLE world. city ADD FULLTEXT INDEX (Name);
F. ALTER TABLE world. city ADD FULLTEXT INDEX (Population);
Correct Answer: B
Reference: https://dev.mysql.com/doc/refman/5.7/en/creating-spatial-indexes.html
Question 2:
Which three are characteristics of a newly created role? (Choose three.)
A. It can be dropped using the DROP ROLE statement.
B. It is stored in MySQL.role table.
C. It is created as a locked account.
D. It can be renamed using the RENAME ROLE statement.
E. It can be granted to user accounts.
F. It can be protected with a password.
Correct Answer: AEF
Question 3:
The data in this instance is transient; no backup or replication will be required. It is currently underperforming.
The database size is static and including indexes is 19G. The total system memory is 32G.
After profiling the system, you highlight this MySQL status and global variables:
The OS metrics indicate that the disk is a bottleneck.
Other variables retain their default values.
Which three changes will provide the most benefit to the instance? (Choose three.)
A. innodb_flush_log_at_trx_commit=1
B. buffer_pool_size=24G
C. innodb_log_file_size=1G
D. sync_binlog=0
E. innodb_doublewrite=0
F. max_connections=10000
G. innodb_undo_directory=/dev/sh
Correct Answer: ACF
Reference: https://aws.amazon.com/blogs/database/best-practices-for-configuring-parameters-foramazon-rds-for-mysql-part-1-parameters-related-to-performance/
Question 4:
Which statement is true about InnoDB persistent index statistics?
A. Updating index statistics is an I/O expensive operation.
B. Index statistics are calculated from pages buffered in the buffer pool for tables with the InnoDB storage engine.
C. Setting innodb_stats_auto_recalc=ON causes statistics to be updated automatically when a new index is created.
D. Execution plans based on transient index statistics improve precision when innodb_stats_persistent_sample_pages is increased.
E. Increasing innodb_stats_persistent_sample_pages determines higher page scanning speed, at the cost of increased memory usage.
F. Tables are scanned and index statistics are recalculated when an instance is restarted.
Correct Answer: D
Reference: https://mariadb.com/kb/en/innodb-persistent-statistics/
Question 5:
Examine the modified output:
Seconds_Behind_ Master value is steadily growing.
What are two possible causes? (Choose two.)
A. The master is most probably too busy to transmit data and the slave needs to wait for more data.
B. One or more large tables do not have primary keys.
C. This value shows only I/O latency and is not indicative of the size of the transaction queue.
D. The master is producing a large volume of events in parallel but the slave is processing them serially.
E. The parallel slave threads are experiencing lock contention.
Correct Answer: CD
Question 6:
You must configure the MySQL command-line client to provide the highest level of trust and security when connecting to a remote MySQL Server.
Which value of –SSL-mode will do this?
A. PREFERRED
B. VERIFY_CA
C. REQUIRED
D. VERIFY_IDENTITY
Correct Answer: C
Reference: https://techdocs.broadcom.com/us/en/ca-enterprise-software/layer7-api-management/apigateway/10-0/install-configure-upgrade/enable-ssl-connections-for-mysql.html
Question 7:
You wish to protect your MySQL database against SQL injection attacks.
Which method would fail to do this?
A. installing and configuring the Connection Control plugin
B. avoiding concatenation of SQL statements and user-supplied values in an application
C. using stored procedures for any database access D. using PREPARED STATEMENTS
Correct Answer: C
Reference: https://www.ptsecurity.com/ww-en/analytics/knowledge-base/how-to-prevent-sql-injectionattacks/
Question 8:
You have just installed MySQL on Oracle Linux and adjusted your /etc/my.conf parameters to suit your installation.
Examine the output:
What statement is true about the start attempt?
A. MySQL server was not started due to a problem while executing process 2732.
B. MySQL server continued to start up even though another process existed.
C. system found the mysqld service disabled and failed to start it.
D. system waited for 30 seconds before timing out and the start-up failed.
E. system attempted to start mysqld, found another system mysqld process running, and shut it down.
Correct Answer: E
Question 9:
Examine these entries from the general query log:
All UPDATE statements reference existing rows.
Which describes the outcome of the sequence of statements?
A. Connection 24 experiences a lock wait timeout.
B. Connection 25 experiences a lock wait timeout.
C. A deadlock occurs immediately.
D. All statements execute without error.
E. A deadlock occurs after innodb_lock_wait_timeout seconds.
Correct Answer: E
Question 10:
Examine this command, which executes successfully:
$ mysqlrouter –bootstrap user@hostname:port –directory=directory_path
Which activity is performed?
A. MySQL Router is configured based on the information in files in directory_path.
B. MySQL Router configures itself based on the information retrieved from the InnoDB cluster metadata server.
C. MySQL Router is restarted.
D. MySQL Router configures all the cluster nodes based on the information retrieved from the InnoDB cluster metadata server.
Correct Answer: B
Reference: https://dev.mysql.com/doc/mysql-router/8.0/en/mysqlrouter.html
Question 11:
You encountered an insufficient privilege error in the middle of a long transaction.
The database administrator is informed and immediately grants the required privilege:
GRANT UPDATE ON world.city TO `user1\’;
How can you proceed with your transaction with the least interruption?
A. Roll back the transaction and start the transaction again in the same session.
B. Re-execute the failed statement in your transaction.
C. Change the default database and re-execute the failed statement in your transaction.
D. Close the connection, reconnect and start the transaction again.
Correct Answer: B
Question 12:
Examine these statements, which execute successfully:
CREATE ROLE r_world_rd;
GRANT SELECT ON world.* TO r_world_rd;
CREATE USER john IDENTIFIED BY `P@ssw0rd\’;
GRANT r_world_rd TO john;
Examine these statements issued by user John:
What is the reason for the error?
A. The statement was blocked by MySQL Firewall.
B. John has not activated the role.
C. John needs to reconnect to the database.
D. The DBA needs to execute FLUSH PRIVILEGES.
Correct Answer: B
Question 13:
Binary log events for the `mydb1\’ schema must be copied to a different schema name `mydb2\’. Which command will do this?
A. mysqlbinlog –rewrite-db=\’mydb1->mydb2\’ | MySQL
B. mysqlbinlog –datebase=mydb1 –database=mydb2 | MySQL
C. mysqlbinlog –rewrite-db=\’mydb1\’ –rewrite-db=\’mydb2\’ | MySQL
D. mysqlbinlog –read-from-remote-server –raw | sed `s/mydb1/mydb2/g\’ | MySQL
Correct Answer: D
Question 14:
Examine this MySQL Shell command: dba.rebootClusterFromCompleteOutage()
Which two statements are true? (Choose two.)
A. It reconfigures InnoDB Cluster if the cluster was stopped.
B. It performs InnoDB Cluster instances rolling restart.
C. It only starts all InnoDB Cluster instances.
D. It is not mandatory that all instances are running and reachable before running the command.
E. It stops and restarts all InnoDB Cluster instances and initializes the metadata.
F. It only stops and restarts all InnoDB Cluster instances.
G. It picks the minimum number of instances necessary to rebuild the quorum and reconfigures InnoDB Cluster.
Correct Answer: BD
Question 15:
Which two statements are true about MySQL server multi-source replication? (Choose two.)
A. It is not compatible with auto-positioning.
B. It needs to be re-instanced after a crash to maintain consistency.
C. It uses only time-based replication conflict resolution.
D. It relies on relay_log_recovery for resilient operations.
E. It does not attempt to detect or resolve replication conflicts.
F. It must use GTID replication.
Correct Answer: CF
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