Lead4Pass 1Z0-908 Exam Dumps Real 1Z0-908 Exam Study Guide – Jan 2023

Lead4Pass 1Z0-908 Exam Dumps

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Question 1:

Examine this statement, which executes successfully:

1Z0-908 exam questions 1

You want to improve the performance of this query:

1Z0-908 exam questions 1-2

Which change enables the query to succeed while accessing fewer rows?


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);


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:

1Z0-908 exam questions 3

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:

1Z0-908 exam questions 5

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?





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:

1Z0-908 exam questions 8

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:

1Z0-908 exam questions 9

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;


GRANT r_world_rd TO john;

Examine these statements issued by user John:

1Z0-908 exam questions 12

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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Lead4Pass 1Z0-888 Exam Dumps Real 1Z0-888 Exam Study Guide – May 2022

Lead4Pass 1Z0-888 Exam Dumps

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Free Share 1Z0-888 Exam Study Guide With Real Exam Questions

Free sample questions of 1Z0-888 free dumps are provided here. 

Question 1:

Which MySQL utility program should you use to process and sort the Slow Query Log based on query time or average query time?

A. mysqldumpslow

B. mysqldump

C. MySQL access

D. MySQL show

E. MySQL slow

Correct Answer: A

Question 2:

Consider: Which statement best describes the meaning of the value for the key_len column?

1Z0-888 free questions 2

A. It shows how many bytes will be used from each index row.

B. It shows the number of characters indexed in the key.

C. It shows the total size of the index row.

D. It shows how many columns in the index are examined.

Correct Answer: A

Question 3:

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\’

Correct Answer: A

Question 4:

1Z0-888 free questions 4

What does the possible_keys column in this output denote?

A. if it is possible for you to include any indexes in your query

B. whether there are any indexes on the tables that you are querying

C. if there are any indexes that may be used to solve this query

D. whether you are using any indexes in your query

Correct Answer: A

Question 5:

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 restoration seems to have slowed down. No other processes or external factors are affecting server performance.

Which is the most likely explanation for this slowdown?

A. The MySQL server has stopped inserting data to check index consistency.

B. InnoDB is doing CRC32 checks over the tablespace data as it grows.

C. The MySQL server is taking a periodical snapshot of data so it can resume the restore if it is interrupted mid-way.

D. InnoDB has filled the redo log and now must flush the pages.

E. Secondary indexes no longer fit into the buffer pool.

Correct Answer: A

Question 6:

Which two options describe how MySQL Server allocates memory? (Choose two.)

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

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

C. Each thread allocates memory from a global pool.

D. Global memory resources are allocated at server startup.

Correct Answer: AD

Question 7:

Which three are the key advantages of standard MySQL replication? (Choose three.)

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

Correct Answer: BEF

Question 8:

You are contacted by a user who does not have permission to access a database table. You determine after an 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?

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

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

C. access is available immediately.

D. The access does not take effect until you issue the FLUSH PRIVILEGES statement.

Correct Answer: C

Question 9:

You have a MySQL replication setup and you intentionally stop the SQL thread on the slave.

1Z0-888 free questions 9

What are two reasons that you may stop the SQL thread on the slave while keeping the I/O thread running? (Choose two.)

A. to allow the remaining events to be processed on the slave while not receiving new events from the master

B. to allow a backup to be created under a reduced load

C. to allow for point-in-time recovery on the slave

D. to prevent schema changes from propagating to the slave before they are validated

E. to prevent any transaction from experiencing a deadlock

Correct Answer: BC

Question 10:

Which two methods accurately monitor the size of your total database size over time? (Choose two.)

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 data-dir size in the operating system

E. monitoring cumulative Innodb_page_size increase

F. monitoring the performance_schema_hosts_size variable

Correct Answer: CF

Question 11:

Consider the index information for the dept_emp table in the employee\’s schema:

1Z0-888 free questions 11

Which two conclusions can be made based on the output of the query? (Choose two.)

A. There are three indexes in the table.

B. There is a redundant index on the dept_no column.

C. The secondary indexes are optimized for unique key lookups.

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 column.

Correct Answer: CF

Question 12:

Which two statements are true about InnoDB auto-increment locking? (Choose two.)

A. InnoDB never uses table-level locks.

B. InnoDB always protects auto-increment updates with a table-level lock

C. InnoDB does not use locks to enforce auto-increment uniqueness.

D. The auto-increment lock can be a table-level lock.

E. Some settings for innodb_autoinc_lock_mode can help reduce locking.

Correct Answer: DE

Question 13:

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 on the slave server.

Which two changes would ensure that the temporary table does not propagate to the slave? (Choose two.)

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 myself 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 me before creating the temporary table.

Correct Answer: BE

Question 14:

Which three allocate memory per thread in MySQL? (Choose three.)

A. query cache

B. thread cache

C. read buffer

D. internal temporary table

E. sort buffer

F. InnoDB buffer pool instance

Correct Answer: CEF

Reference: https://dev.mysql.com/doc/refman/5.6/en/memory-use.html

Question 15:

Suppose you are adding rows to a MyISAM table and the –data-dir location runs out of disk space. What will happen when this occurs?

A. The server will crash.

B. The server suspends that INSERT operation until space becomes available.

C. An error message will be returned to the client. Server Error: ER_IO

D. The server suspends operations for all storage engines until space becomes available.

Correct Answer: B


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