[Sep 20, 2023] Pass Oracle 1Z0-888 Exam Info and Free Practice Test
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Oracle 1Z0-888 (MySQL 5.7 Database Administrator) exam is a certification that validates the skills and knowledge required for managing and maintaining MySQL databases. It is designed for individuals who are responsible for installing, configuring, and managing MySQL databases. 1Z0-888 exam covers a wide range of topics, from basic database concepts to advanced topics such as high availability, performance tuning, and security. Passing 1Z0-888 exam demonstrates that the candidate has the expertise and skills required to manage and maintain MySQL databases efficiently.
NEW QUESTION # 70
Consider:
Which statement best describes the meaning of the value for the key_len column?
- A. It shows the number of characters indexed in the key.
- B. It shows how many bytes will be used from each index row.
- C. It shows the total size of the index row.
- D. It shows how many columns in the index are examined.
Answer: B
NEW QUESTION # 71
Consider these global status variables:
Which two conclusions can be made from the output? (Choose two.)
- A. There are more connections being idle than executing queries.
- B. There are 510 connections to MySQL at the time of the output.
- C. There are 140 Performance Schema threads at the time of the output.
- D. All max_connectionswere in use at 2018-03-22 14:54:06
- E. The thread cache has been configured with thread_cache_sizeset to at least 6.
Answer: A,B
NEW QUESTION # 72
An administrator installs MySQL to run under a mysqlOS account. The administrator decides to disable logins to the mysqlaccount by using /nologinor /bin/falseas the user's shell setting.
Which statement is true?
- A. This prevents mysqldfrom starting when standard startup scripts are used.
- B. The mysqluser needs a login and its home directory must be the base directory of the installation.
- C. This prevents creation of a command shell with the mysqlaccount, while allowing mysqldto run.
- D. The OS needs to allow logging in as mysqlso that administrative tasks can be performed.
Answer: B
Explanation:
Explanation/Reference:
NEW QUESTION # 73
You back up by using mysqldump.
Which configuration is required on the MySQL Server to allow point-in-time recovery?
- A. gtid_enable
- B. binlog_format=STATEMENT
- C. apply-log
- D. log-bin
- E. bonlog_format=ROW
Answer: D
Explanation:
Explanation/Reference: https://dev.mysql.com/doc/mysql-backup-excerpt/5.7/en/point-in-time-recovery.html
NEW QUESTION # 74
You have the following in your my.cnf configuration file:
[ mysqld]
default_authentication_plugin=sha256_password
You want to create a new user who will be connecting from the IP address 192.0.2.10, and you want to use the authentication plug-in that implements SHA-256 hashing for user account passwords.
Which two statements would create a user named webdesign for this IP address with the password of imbatman using a SHA_256 password hash? (Choose two.)
- A. CREATE USER 'webdesign'@'192.0.2.10' IDENTIFIED BY 'iambatman';
- B. CREATE USER WITH sha256_password 'sha256_user'@'192.0.2.10' IDENTIFIED AS
' webdesign' USING 'imbatman'; - C. CREATE USER 'webdesign'@'192.0.2.10' WITH mysql_native_password USING SHA265 BY 'imbatman';
- D. CREATE USER 'webdesign'@'192.0.2.10' IDENTIFIED BY SHA265 AS 'imbatman';
- E. CREATE USER 'webdesign'@'192.0.2.10' IDENTIFIED AS sha256_user WITH
sha256_password 'imbatman'; - F. CREATE USER 'webdesign'@'192.0.2.10' IDENTIFIED WITH sha256_password BY
'imbatman';
Answer: A,D
Explanation:
Explanation/Reference:
Reference: https://dev.mysql.com/doc/refman/8.0/en/sha256-pluggable-authentication.html
NEW QUESTION # 75
You have the following in your my.cnf configuration file:
[mysqld]
default_authentication_plugin=sha256_password
You want to create a new user who will be connecting from the IP address 192.0.2.10, and you want to use the authentication plug-in that implements SHA-256 hashing for user account passwords.
Which two statements would create a user named webdesign for this IP address with the password of imbatman using a SHA_256 password hash?
- A. CREATE USER 'webdesign'@'192.0.2.10' IDENTIFIED BY 'iambatman';
- B. CREATE USER 'webdesign'@'192.0.2.10' IDENTIFIED BY SHA265 AS 'imbatman';
- C. CREATE USER 'webdesign'@'192.0.2.10' IDENTIFIED AS sha256_user WITH
sha256_password 'imbatman'; - D. CREATE USER WITH sha256_password 'sha256_user'@'192.0.2.10' IDENTIFIED AS
'webdesign' USING 'imbatman'; - E. CREATE USER 'webdesign'@'192.0.2.10' IDENTIFIED WITH sha256_password BY
'imbatman'; - F. CREATE USER 'webdesign'@'192.0.2.10' WITH mysql_native_password USING SHA265 BY
'imbatman';
Answer: A,B
NEW QUESTION # 76
The /myfolder/my.cnffile has option set:
[mysqld]
skip-log-bin
myfolder2/my.cnfhas this option set:
/
[ mysqld]
log-bin = /valid/path/to/mysqlbinlog
All mentioned paths are accessible to the account that you are currently using. Assume that any other options mentioned in either file are valid and legal option definitions.
You start an instance by using this command line:
mysqld --defaults-file=/myfolder/my.cnf --defaults-extra-file=/myfolder2/my.cnf What is the outcome?
- A. MySQL starts and Binary Logging is enabled.
- B. MySQL starts but Binary Logging is disabled.
- C. MySQL fails to start due to conflicting options on the command line.
- D. MySQL fails to start due to the conflicting options in the configuration files.
Answer: C
NEW QUESTION # 77
Host slave1 has ip address 192.0.2.10.
Host slave2 has ip address 203.0.113.50
Examine these commands:
Why did this error occur?
- A. There is no password defined in the login path.
- B. The mysqld instance has not been restarted after creating the login path.
- C. The .mylogin.cnf file is not readable.
- D. The host on the command line is not defined in the login path.
- E. The DNS is not configured correctly for slave1 host.
Answer: C
NEW QUESTION # 78
You have a MySQL instance with the following variables in the /etc/my.cnf file:
You issue these statements:
USE prices;
UPDATE sales.january SET amount=amount+1000;
An hour after excluding the statements, you realize that you made a mistake and you want to go to the binary log and look at the statements again.
Which statement is true? (Choose two.)
- A. Nothing was written to the binary log because you cannot perform a calculation in a query without enclosing the statement in single quotation marks.
- B. Nothing is logged because you are executing an UPDATE statement that will cause changes to more than one row, and you do not have the --binlog-format value set to STATEMENT.
- C. You would receive an error on the statement because you cannot update a different database that what is specified with the USE statement.
- D. The changes caused by the UPDATE statement are logged to the binary log because the instance is using --binlog-format = ROW
- E. The statement would fail because you cannot update more than one row at a time when using -binlogformat = ROW.
Answer: A,B
NEW QUESTION # 79
After analysis on the slow query log on a high-end OLTP service, the table identified in the slow queries is:
What are the two most likely reasons for the slowness given this output?
- A. The engine type is not appropriate to the application use.
- B. Using default values for DATETIMEcauses table scans.
- C. Dateshould be a TIMESTAMPfield for better performance.
- D. No indexes are defined.
- E. The User field is too long for most names.
Answer: A,D
NEW QUESTION # 80
Which two statements are true regarding MySQL security? (Choose two.)
- A. The root or administrator users should own all files and directories to which the server writes.
- B. The mysqld process should not be run as root or administrator.
- C. The mysqld process owner should own all files and directories to which the server writes.
- D. The mysql user needs to have sudo privileges.
- E. The mysqld process should be run as root or administrator.
Answer: A,B
NEW QUESTION # 81
The following grants were executed:
GRANT CREATE ROUTING ON sales.* TO 'webadmin'@'%';
GRANT ALTER ON PROCEDURE sales.myproc TO 'webadmin'@'%';
A user successfully connects to the database as webadminand created a stored procedure named get_reports.The next day, the user logs in again as webadminand wants to delete the stored procedure named get_reports,and therefore, issues the following statement:
USE sales;
DROP PROCEDURE IF EXISTS get_reports;
What is the result of executing the statement?
- A. The user will get an error because he or she did not put the database name in front of the stored procedure name.
- B. The user will get an error because he or she does not have the permission to drop stored procedures.
- C. The stored procedure named get_reportswill be dropped.
- D. The user will get an error because he or she did not use the ALTERstatement to drop the stored procedure.
Answer: C
NEW QUESTION # 82
Which three allocate memory per thread in MySQL?
- A. query cache
- B. InnoDB buffer pool instance
- C. read buffer
- D. sort buffer
- E. thread cache
- F. internal temporary table
Answer: B,C,D
Explanation:
Reference:
https://dev.mysql.com/doc/refman/5.6/en/memory-use.html
NEW QUESTION # 83
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. --defaults-file=/etc/mysql/instance2.cnf
- B. --backup-instance=/var/lib/mysql/instance2
- C. --instance=/var/lib/mysql/instance2
- D. --restore=2
- E. --copy-back-from-log
Answer: A
NEW QUESTION # 84
The following grants were executed:
GRANT CREATE ROUTING ON sales.* TO 'webadmin'@'%';
GRANT ALTER ON PROCEDURE sales.myproc TO 'webadmin'@'%';
A user successfully connects to the database as webadmin and created a stored procedure named get_reports.
The next day, the user logs in again as webadmin and wants to delete the stored procedure named get_reports, and therefore, issues the following statement:
USE sales;
DROP PROCEDURE IF EXISTS get_reports;
What is the result of executing the statement?
- A. The user will get an error because he or she did not put the database name in front of the stored procedure name.
- B. The stored procedure named get_reports will be dropped.
- C. The user will get an error because he or she does not have the permission to drop stored procedures.
- D. The user will get an error because he or she did not use the ALTER statement to drop the stored procedure.
Answer: B
NEW QUESTION # 85
A MySQL instance has this configuration values set:
A transaction involving a single InnoDB INSERTstatement commits.
Which list of locations is in the sequence of disk writes for this transaction?
- A. redo log, binary log, doublewrite buffer, and tablespace
- B. binary log, redo log, doublewrite buffer, and tablespace
- C. redo log, doublewrite buffer, tablespace, and binary log
- D. doublewrite buffer, redo log, tablespace, and binary log
Answer: B
NEW QUESTION # 86
Suppose you are adding rows to a MyISAM table and the --datadirlocation runs out of disk space.
What will happen when this occurs?
- A. The server will crash.
- B. An error message will be returned to the client .Server Error: ER_IO
- C. The server suspends operations for all storage engines until space becomes available.
- D. The server suspends that INSERT operation until space becomes available.
Answer: D
NEW QUESTION # 87
A simple master-to-slave replication is currently being used. This information is extracted from the SHOW SLAVE STATUSoutput:
You execute a 'SHOW CREATE TABLE mytable" on the slave:
The table mytable on the slave contains:
You have issued a STOP SLAVEcommand. 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 SLAVEcommand to resolve the duplicate key error. Which statement should be used?
- A. SET GLOBAL enforce_gtid_consistency=ON
- B. SET GTID_NEXT="CONSISTENCY";
BEGIN; COMMIT;
SET GTID_NEXT="AUTOMATIC"; - C. SET GTID_EXECUTED="5da6b4f5-6f60-11e8-b2d6-0010e05f3e06:8";
- D. SET GLOBAL SQL_SKIP_SLAVE_COUNTER=1
- E. SET GTID_NEXT="5da6b4f5-6f60-11e8-b2d6-0010e05f3e06:8";
BEGIN; COMMIT;
SET GTID_NEXT="AUTOMATIC";
Answer: D
Explanation:
Explanation/Reference: https://dev.mysql.com/doc/refman/8.0/en/replication-problems.html
NEW QUESTION # 88
Why should you be selective when granting the PROCESSprivilege to an account?
- A. It allows a client to process scripts.
- B. It allows the use of stored routines.
- C. It allows a client to control running processes on a server.
- D. It allows a client to see another user's queries with the SHOW PROCESSLISTcommand.
Answer: C
Explanation:
Explanation/Reference: https://dev.mysql.com/doc/refman/8.0/en/privileges-provided.html
NEW QUESTION # 89
The MySQL error log shows:
InnoDB: Warning: a long semaphore wait:
The relevant parts of the InnoDB monitor output shows:
Which two options would help avoid the long wait in the future? (Choose two.)
- A. Increase the size of the InnoDB buffer pool.
- B. Deactivate the query cache.
- C. Increase the value of the innodb_lock_wait_timeoutoption.
- D. Increase the value of the innodb_read_io_threadsoption.
- E. Change the table to use HASH indexes instead of BTREE indexes.
- F. Set the value of innodb_adaptive_hash_indexto zero.
Answer: A,D
NEW QUESTION # 90
Consider the index information for the dept_emptable in the employee's schema:
Which two conclusions can be made based on the output of the query? (Choose two.)
- A. There is a redundant index on the dept_nocolumn.
- B. There are three indexes on the table.
- C. The values on the emp_nocolumn must be unique.
- D. The selectivity of the dept_nocolumn is the best of the indexed columns.
- E. The secondary indexes are optimized for unique key look-ups.
- F. There is a redundant index on the emp_nocolumn.
Answer: E,F
NEW QUESTION # 91
Which statement describes how the relay log works?
- A. It maintains a record of available master binary logs and the current executed log position.
- B. when a slave receives a change from the master, it is processed first, and then recorded in the relay log.
- C. It stores changes on the master, and relays them to the slave.
- D. When a slave receives a change from the master, it is recorded in the relay log first and processed later.
Answer: A
NEW QUESTION # 92
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