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You have just executed a manual backup by using this command:
mysqlbackup –u root –p
Correct Answer: E
Examine the mydata table and SELECT statements:
mysql> update mydata set a=0 where b=3;
How many rows are now protected by locks with the default InnoDB configuration?
B. one row and a next-key lock for supremum
C. one row and a gap-lock
Correct Answer: D
Is it true that binary backups always take less space than text backups?
A. Yes, because binary backups only contain data, and not statements required to insert data into the tables.
B. No, because text backups can have optimizations, which make them smaller, such as updating many rows at once.
C. No, because if InnoDB tables contain many empty pages, they could take more space than the INSERT statements.
D. Yes, because even if InnoDB tables contain many empty pages, text backups have empty INSERT statements for them.
Correct Answer: C
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 restore seems to have slowed down. No other processes or external factors are affecting server performance.
Which is the most likely 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
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
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
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
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
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
Consider the key buffer in a MySQL server. Which two statements are true about this feature? (Choose two.)
A. It caches index blocks for MyISAM tables only.
B. It caches index blocks for all storage engine tables.
C. It is a global buffer.
D. It is set on a per-connection basis.
E. It caches index blocks for InnoDB tables only.
Correct Answer: AD
You will configure a MySQL Server to act as a replication master. Which two options must be configured correctly to allow this? (Choose two.)
Correct Answer: CE
You have a MySQL instance with the following variables in the /etc/my.cnf file:
You issue these statements:
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
A master-slave replication setup has the slave showing this error:
On the master server, the binary logs show:
What could explain this error? (Choose two.)
A. binlog_cache_size=1024 is too small and transactions are lost.
B. binlog_format=STATEMENT and a non-deterministic query was executed.
C. enforce_gtid_consistency=ON and consistency is broken between the master and the slave.
D. The sync_relay_log=1000 setting on the slave is too small.
E. sync_binlog=0 and the master server crashed.
Correct Answer: AC
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:
What are two possible causes for this error to occur? (Choose two.)
A. The applications have the SUPER privilege, which allows them to update rows.
B. The root user on the slave has executed FLUSH LOGS, causing the relay-log to doublewrite.
C. For tables with UNIQUE keys, statement-based replication must be used to maintain integrity.
D. The slave was created with mysqldump –u root –p –skip-lock-tables –all-databases > /data/data.sql
E. The slave user does not have INSERT, UPDATE, or DELETE permission and cannot execute the Write_rows function.
Correct Answer: CD
A MySQL Server has been running an existing application successfully for six months. The my.cnf is adjusted to contain this additional configuration:
The MySQL Server is restarted without error.
What effect will the new configuration have on existing account?
A. They are not affected by this configuration change.
B. They all connect via the secure sha256_password algorithm without any configuration change.
C. They will have their passwords updated on start-up to sha256_password format.
D. They will have to change their password the next time they login to the server.
Correct Answer: A