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Oracle Database

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Question 1:

You have just executed a manual backup by using this command:

mysqlbackup –u root –p

Correct Answer: E


Question 2:

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. mysqlaccess

D. mysqlshow

E. mysqlslow

Correct Answer: A


Question 3:

Consider:

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

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 4:

Examine the mydata table and SELECT statements:

You issue:

mysql> begin;

mysql> update mydata set a=0 where b=3;

How many rows are now protected by locks with the default InnoDB configuration?

A. one

B. one row and a next-key lock for supremum

C. one row and a gap-lock

D. five

Correct Answer: D


Question 5:

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 6:

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?

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. The access is available immediately.

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

Correct Answer: C


Question 7:

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

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 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 experiencing a deadlock

Correct Answer: BC


Question 8:

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 datadir size in the operating system

E. monitoring cumulative Innodb_page_size increase

F. monitoring the performance_schema_hosts_size variable

Correct Answer: CF


Question 9:

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 10:

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 to 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 mysqld 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 mysqld before creating the temporary table.

Correct Answer: BE


Question 11:

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 12:

Suppose you are adding rows to a MyISAM table and the –datadir 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


Question 13:

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? (Choose two.)

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

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

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

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

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

F. It provides means to help avoid accidentally exposing the MySQL login details.

Correct Answer: EF

Reference: https://dev.mysql.com/doc/refman/8.0/en/mysql-config-editor.html


Question 14:

Due to an authentication plug-in that is used on the server, passwords are required to be sent as clear text as opposed to the usual encrypted format.

Which two methods would allow the mysql client to connect to the server and send clear text passwords? (Choose two.)

A. mysql –protocol=PLAIN –uroot –p –h dbhost.example.com

B. INSTALL PLUGIN mysql_cleartext_password SONAME `mysql_cleartext_password.so\’;

C. export LIBMYSQL_ENABLE_CLEARTEXT_PLUGIN=\’Y\’

D. SET GLOBAL mysql_cleartext_passwords=1;

E. mysql –enable-cleartext-plugin –uroot –p –h dbhost.example.com

Correct Answer: DE

Reference: https://dev.mysql.com/doc/refman/5.7/en/cleartext-pluggable-authentication.html


Question 15:

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. You would receive an error on the statement because you cannot update a different database that what is specified with the USE statement.

B. The changes caused by the UPDATE statement are logged to the binary log because the instance is using –binlog-format = ROW

C. The statement would fail because you cannot update more than one row at a time when using –binlog-format = ROW.

D. 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.

E. Nothing was written to the binary log because you cannot perform a calculation in a query without enclosing the statement in single quotation marks.

Correct Answer: DE


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