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Introduction to Oracle 1Z0-908: MySQL 8.0 Database Administrator Exam
Oracle 1Z0-908: MySQL 8.0 Database Administrator Administration Exam assesses the abilities of the Database Administrators and System Administrators who have at least 1 year of experience in RAC and Grid Infrastructure. The candidates should have the ability to install, manage, tracking, tuning, and restoring RAC databases, cluster, and Oracle Automatic Storage Management (ASM). They should have a good understanding of the architectures of the ASM, Clusterware, and Oracle RAC databases. They should also know how to install, setup, backup, and recovery monitoring and tuning of these components.
Oracle Real Application Clusters (RAC) in database computing is a choice for Oracle Database software developed by Oracle Corporation, it provides clustering software and high availability in Oracle database environments. With the Enterprise Version, Oracle Corporation includes RAC, provided the nodes are clustered using Oracle Clusterware. Oracle RAC allows several machines when accessing a single database, to run Oracle RDBMS software simultaneously, offering to cluster.
The Oracle Grid Infrastructure for an independent server is the Oracle software that offers system support for a database including the file system, volume management, and automation of the restart process. If you want to utilize the Oracle restart or Oracle Automatic Storage Management (ASM) services, you have to install Oracle grid infrastructure before installing Oracle Database.
How to book the Oracle 1Z0-908: MySQL 8.0 Database Exam
If you are looking to appear in the Oracle 1Z0-908: MySQL 8.0 Database Exam, you can do so by either redeeming a voucher that you must buy from Oracle or paying directly with a credit card. After payment, you can schedule the test via Oracle’s external testing provider, PearsonVue.
NEW QUESTION 46
You wish to store the username and password for a client connection to MySQL server in a file on a local file system.
Which is the best way to encrypt the file?
- A. Use a text editor to create a new defaults file and encrypt it from Linux prompt.
- B. Use mysql_secure_installation to encrypt stored login credentials.
- C. Use mysql_config_editor to create an encrypted file.
- D. Use the AES_ENCRYPT() MySQL function on the option file.
Answer: C
NEW QUESTION 47
Which two statements are true about MySQL server multi-source replication? (Choose two.)
- A. It uses only time-based replication conflict resolution.
- B. It is not compatible with auto-positioning.
- C. It relies on relay_log_recovery for resilient operations.
- D. It does not attempt to detect or resolve replication conflicts.
- E. It must use GTID replication.
- F. It needs to be re-instanced after a crash to maintain consistency.
Answer: A,E
NEW QUESTION 48
An attempt to recover an InnoDB Cluster fails.
Examine this set of messages and responses:
host3:3377 ssl JS > dba.rebootClusterFromCompleteOutage() Reconfiguring the default cluster from complete outage...
The instance 'host1:3377'' was part of the cluster configuration. Would you like to rejoin it to the cluster? [y/N]: y The instance 'host2:3377' was part of the cluster configuration. Would you like to rejoin it to the cluster? [y/N]: y Dba.rebootClusterFromCompleteOutage: The active session instance isn't the most updated in comparison with the ONLINE instances of the Cluster's metadat a. Please use the most up to date instance: 'host1:3377'. (RuntimeError) Which statement is true?
- A. The instance deployed on host3 must be synchronized from a donor deployed on host1 by using the command cluster.addInstance('host1:3377').
- B. It is possible to determine the most up-to-date instance by comparing different global transaction identifier (GTID) sets with GTID_SUBSET(set1,set2).
- C. The instance deployed on host3 must be rebuilt with a backup from the primary instance.
- D. The cluster is running and there is at least one ONLINE instance.
- E. The active session instance is invalid and must be re-created by using the command shell.connect ('host3:3377').
Answer: A
NEW QUESTION 49
Examine this command and output:
Which two statements are true? (Choose two.)
- A. The lock is at the table object level.
- B. The lock is a row-level lock.
- C. The lock is at the metadata object level.
- D. The lock is a shared lock.
- E. The lock is an intentional lock.
- F. The lock is an exclusive lock.
Answer: A,F
NEW QUESTION 50
Which step or set of steps can be used to rotate the error log?
- A. Execute SET GLOBAL expire_logs_days=0to enforce a log rotation.
- B. Execute SET GLOBAL max_error_count = <number of messages at point to rotate>.
- C. Rename the error log file on disk, and then execute FLUSH ERROR LOGS.
- D. Execute SET GLOBAL log_error = ‘<new error log file>’.
Answer: C
Explanation:
Explanation/Reference: https://blog.pythian.com/mysql-log-rotation/
NEW QUESTION 51
You want to check the values of the sort_buffer_size session variables of all existing connections.
Which performance_schema table can you query?
- A. variables_by_thread
- B. global_variables
- C. session_variables
- D. user_variables_by_thread
Answer: C
NEW QUESTION 52
Examine this query:
What information does this query provide?
- A. total memory used by thread number 10
- B. total memory used across all connections associated with the user on connection number 10
- C. total memory used by connection number 10
- D. total memory used across all connections associated with the user on thread number 10
- E. total memory used by the first 10 connections
- F. total memory used by the first 10 threads
Answer: C
NEW QUESTION 53
Which statement is true about InnoDB persistent index statistics?
- A. Tables are scanned and index statistics recalculated when an instance is restarted.
- B. Setting innodb_stats_auto_recalc=ON causes statistics to be updated automatically when a new index is created.
- C. Index statistics are calculated from pages buffered in the buffer pool for tables with InnoDB storage engine.
- D. Increasing innodb_stats_persistent_sample_pages determines higher pages scanning speed, at the cost of increased memory usage.
- E. Execution plans based on transient index statistics improve precision when innodb_stats_persistent_sample_pages is increased.
- F. Updating index statistics is an I/O expensive operation.
Answer: E
NEW QUESTION 54
The data in this instance is transient; no backup or replication will be required. It is currently under performing.
The database size is static and including indexes is 19G.
Total system memory is 32G.
After profiling the system, you highlight these MySQL status and global variables:
The OS metrics indicate that 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_log_file_size=1G
- B. innodb_flush_log_at_trx_commit=1
- C. sync_binlog=0
- D. innodb_undo_directory=/dev/shm
- E. max_connections=10000
- F. buffer_pool_size=24G
- G. innodb_doublewrite=0
Answer: A,B,E
NEW QUESTION 55
Which four are types of information stored in the MySQL data dictionary? (Choose four.)
- A. stored procedure definitions
- B. table definitions
- C. server runtime configuration
- D. server configuration rollback
- E. access control lists
- F. InnoDB buffer pool LRU management data
- G. performance metrics
- H. view definitions
Answer: A,B,D,H
NEW QUESTION 56
Which two are contained in the InnoDB system tablespace (ibdata1) by default? (Chose two.)
- A. primary indexes
- B. user privileges
- C. InnoDB Data Dictionary
- D. table data
- E. change buffer
- F. doublewrite buffer
Answer: C,F
NEW QUESTION 57
t is a non-empty InnoDB table.
Examine these statements, which are executed in one session:
BEGIN;
SELECT * FROM t FOR UPDATE;
Which is true?
- A. If OPTIMIZE TABLE; is invoked, it will create a table lock on t and force a transaction rollback.
- B. If ANALYZE TABLE; is invoked from the same session, it hangs until the transaction is committed or rolled back.
- C. If OPTIMIZE LOCAL TABLE t; is invoked from another session, it executes normally and returns the status.
- D. mysqlcheck --analyze --all-databases will execute normally on all tables and return a report.
Answer: C
NEW QUESTION 58
Which two storage engines provide a view of the data consistent with the storage system at any moment?
(Choose two.)
- A. InnoDB
- B. MEMORY
- C. ARCHIVE
- D. NDB
- E. MyISAM
Answer: B,E
Explanation:
Explanation/Reference: https://zetcode.com/mysql/storageengines/
NEW QUESTION 59
Your MySQL installation is running low on space due to binary logs. You need to reduce your log space usage urgently.
Which two sets of actions when completed will accomplish this? (Choose two.)
- A. Use SET GLOBAL binlog_expire_logs_seconds=<value> and restart the server.
- B. Set binlog_expire_logs_seconds in my.cnf.
- C. Set binlog_expire_logs_seconds = 0 in my.cnf and restart the server.
- D. Use PURGE BINARY LOGS to <binlog_name>.
- E. Use SET GLOBAL binlog_expire_logs_seconds=<value> and run the FLUSH BINARY LOGS command.
- F. Use SET PERSIST binlog_expire_logs_seconds=<value>.
Answer: A,F
NEW QUESTION 60
Examine this SQL statement:
Which set of privileges will allow Tom to execute this SQL statement?
- A. GRANT UPDATE ON 'world'.'city' TO 'tom'@'%'; GRANT SELECT ON 'world'.'country' TO 'tom'@'%';
- B. GRANT UPDATE ON 'world'.* TO 'tom'@'%';
GRANT ALL PRIVILEGES ON 'world'.'country' TO 'tom'@'%'; - C. GRANT UPDATE ON 'world'.'city' TO 'tom'@'%'; GRANT SELECT ON 'world'.* TO 'tom'@'%';
- D. GRANT ALL PRIVILEGES ON 'world'.'city' TO 'tom'@'%';
GRANT SELECT ('code') ON 'world'.'country' TO 'tom'@'%';
Answer: A
NEW QUESTION 61
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