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NEW QUESTION 36
Examine these commands and output:
Which connection ID is holding the metadata lock?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
- F. 5
Answer: D
NEW QUESTION 37
Examine the modified output:
Seconds_Behind_ Mastervalue is steadily growing.
What are two possible causes? (Choose two.)
- A. This value shows only I/O latency and is not indicative of the size of the transaction queue.
- B. The master is producing a large volume of events in parallel but the slave is processing them serially.
- C. One or more large tables do not have primary keys.
- D. The parallel slave threads are experiencing lock contention.
- E. The master is most probably too busy to transmit data and the slave needs to wait for more data.
Answer: A,B
Explanation:
Explanation
NEW QUESTION 38
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 INDEX (Name);
- C. ALTER TABLE world.city ADD INDEX (Population);
- D. ALTER TABLE world.city ADD FULLTEXT INDEX (Name);
- E. ALTER TABLE world.city ADD FULLTEXT INDEX (Population);
- F. ALTER TABLE world.city ADD SPATIAL INDEX (Population);
Answer: F
Explanation:
Explanation/Reference: https://dev.mysql.com/doc/refman/5.7/en/creating-spatial-indexes.html
NEW QUESTION 39
Examine this query and output:
Which two statements are true? (Choose two.)
- A. The optimizer estimates that 51 rows in the country table have Continent = 'Asia'.
- B. It takes more than 8 milliseconds to sort the rows.
- C. The query returns exactly 125 rows.
- D. The country table is accessed as the first table, and then joined to the city table.
- E. 35 rows from the city table are included in the result.
Answer: A,E
NEW QUESTION 40
A valid raw backup of the shop.customers MyISAM table was taken.
You must restore the table. You begin with these steps:
1. Confirm that secure_file_priv='/var/tmp'
2. mysql> DROP TABLE shop.customers;
3. shell> cp /backup/customers.MY* /var/lib/mysql/shop/
Which two actions are required to complete the restore? (Choose two.)
- A. mysql> IMPORT TABLE FROM /var/tmp/customers.sdi
- B. shell> cp /backup/customers.sdi /var/lib/mysql/shop/
- C. mysql> ALTER TABLE shop.customers IMPORT TABLESPACE
- D. shell> cp /backup/customers.sdi /var/tmp
- E. mysql> SOURCE '/var/tmp/customers.sdi'
- F. mysql> ALTER TABLE shop.customers DISCARD TABLESPACE
- G. shell> cp /backup/customers.frm /var/lib/mysql/shop/
- H. mysql> IMPORT TABLE FROM /var/lib/mysql/shop/customers.sdi
Answer: A,C
NEW QUESTION 41
Which two are contained in the InnoDB system tablespace (ibdata1) by default? (Chose two.)
- A. table data
- B. primary indexes
- C. user privileges
- D. change buffer
- E. doublewrite buffer
- F. InnoDB Data Dictionary
Answer: E,F
NEW QUESTION 42
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. Close the connection, reconnect, and start the transaction again.
- B. Re-execute the failed statement in your transaction.
- C. Roll back the transaction and start the transaction again in the same session.
- D. Change the default database and re-execute the failed statement in your transaction.
Answer: B
NEW QUESTION 43
Which step or set of steps can be used to rotate the error log?
- A. Execute SET GLOBAL log_error = ‘<new error log file>’.
- B. Execute SET GLOBAL expire_logs_days=0to enforce a log rotation.
- C. Execute SET GLOBAL max_error_count = <number of messages at point to rotate>.
- D. Rename the error log file on disk, and then execute FLUSH ERROR LOGS.
Answer: D
Explanation:
Explanation/Reference: https://blog.pythian.com/mysql-log-rotation/
NEW QUESTION 44
What does the binlog dump thread do?
- A. It connects to the master and asks it to send updates recorded in its binary logs.
- B. It monitors and schedules the rotation/deletion of the binary logs.
- C. It reads the relay log and executes the events contained in them.
- D. It acquires a lock on the binary log for reading each event to be sent to the slave.
Answer: A
NEW QUESTION 45
Which two are true about binary logs used in asynchronous replication? (Choose two.)
- A. They contain events that describe database changes on the master.
- B. They are pushed from the master to the slave.
- C. They contain events that describe all queries run on the master.
- D. They are pulled from the master to the slave.
- E. They contain events that describe only administrative commands run on the master.
Answer: A,B
NEW QUESTION 46
Which four are types of information stored in the MySQL data dictionary? (Choose four.)
- A. performance metrics
- B. table definitions
- C. server configuration rollback
- D. InnoDB buffer pool LRU management data
- E. stored procedure definitions
- F. access control lists
- G. view definitions
- H. server runtime configuration
Answer: B,C,E,G
NEW QUESTION 47
Which two are characteristics of snapshot-based backups? (Choose two.)
- A. A separate physical copy must be made before releasing the snapshot backup.
- B. The frozen file system can be cloned to another virtual machine immediately into active service.
- C. Snapshot-based backups greatly reduce time during which the database and applications are unavailable.
- D. Snapshot backups can be used only in virtual machines.
- E. There is no need for InnoDB tables to perform its own recovery when restoring from the snapshot backup.
Answer: A,D
NEW QUESTION 48
Which four connection methods can MySQL clients specify with the --protocol option when connecting to a MySQL server? (Choose four.)
- A. DIRECT
- B. IPv6
- C. TCP
- D. MEMORY
- E. FILE
- F. IPv4
- G. PIPE
- H. SOCKET
Answer: C,D,G,H
NEW QUESTION 49
You have just installed MySQL on Oracle Linux and adjusted your /etc/my.cnf parameters to suit your installation.
Examine the output:
What statement is true about the start attempt?
- A. systemd attempted to start mysqld, found another systemd mysqld process running, and shut it down.
- B. MySQL server continued to start up even though another process existed.
- C. systemd waited for 30 seconds before timing out and start up failed.
- D. MySQL server was not started due to a problem while executing process 2732.
- E. systemd found the mysqld service disabled and failed to start it.
Answer: A
NEW QUESTION 50
You made some table definition changes to a schema in your MySQL Server.
Which two statements reflect how MySQL Server handles the table definition changes? (Choose two.)
- A. MySQL implicitly executes FLUSH TABLES and stores a snapshot backup of the metadata.
- B. MySQL writes SDI to the binary log for distributed backups.
- C. The metadata is serialized in JSON format in Serialized Dictionary Information (SDI).
- D. MySQL keeps InnoDB metadata changes in .sdi files in datadir.
- E. MySQL Server stores a copy of the serialized data in the InnoDB user tablespace.
Answer: C,E
NEW QUESTION 51
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Who should take the Oracle 1Z0-908: MySQL 8.0 Database Exam
This course is designed for Database Administrators and Database production Systems Administrators.
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