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1Z0-908 Test Score Report & 1Z0-908 Exam Questions

1Z0-908 Test Score Report & 1Z0-908 Exam Questions

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Oracle MySQL 8.0 Database Administrator Sample Questions (Q38-Q43):

NEW QUESTION # 38
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 metadata. Please use the most up to date instance: ‘host1:3377’.
(RuntimeError)
Which statement is true?

  • A. The cluster is running and there is at least one ONLINE instance.
  • B. The active session instance is invalid and must be re-created by using the command shell.connect (‘host3:3377’).
  • C. It is possible to determine the most up-to-date instance by comparing different global transaction identifier (GTID) sets with GTID_SUBSET(set1,set2).
  • D. The instance deployed on host3 must be rebuilt with a backup from the primary instance.
  • E. The instance deployed on host3 must be synchronized from a donor deployed on host1 by using the command cluster.addInstance(‘host1:3377’).

Answer: E

NEW QUESTION # 39
You reconfigure and start a slave that was not replicating for several days.
The configuration file and CHANGE MASTERcommand are correct.
Examine the GTID information from both master and slave:

Which statement is true?

  • A. Replication will fail because the slave has purged more aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa transactions than the master.
  • B. Replication will fail because of inconsistent numbers in cccccccc-cccc-cccc-cccc-cccccccccccc GTIDs.
  • C. Replication will fail because the master does not have the required transaction with bbbbbbbb-bbbb- bbbb-bbbb-bbbbbbbbbbbbGTIDs in its binary logs.
  • D. Replication will fail because the master has already purged transactions with cccccccc-cccc-cccc- cccc-ccccccccccccGTIDs.
  • E. Replication will work.

Answer: A

Explanation:
Explanation/Reference: https://bugs.mysql.com/bug.php?id=86643

NEW QUESTION # 40
Which statement is true about InnoDB persistent index statistics?

  • A. Tables are scanned and index statistics recalculated when an instance is restarted.
  • B. Updating index statistics is an I/O expensive operation.
  • C. Execution plans based on transient index statistics improve precision when innodb_stats_persistent_sample_pages is increased.
  • D. Index statistics are calculated from pages buffered in the buffer pool for tables with InnoDB storage engine.
  • E. Setting innodb_stats_auto_recalc=ON causes statistics to be updated automatically when a new index is created.
  • F. Increasing innodb_stats_persistent_sample_pages determines higher pages scanning speed, at the cost of increased memory usage.

Answer: C

NEW QUESTION # 41
Which two are true about binary logs used in asynchronous replication? (Choose two.)

  • A. They are pushed from the master to the slave.
  • B. They are pulled from the master to the slave.
  • C. They contain events that describe only administrative commands run on the master.
  • D. They contain events that describe database changes on the master.
  • E. They contain events that describe all queries run on the master.

Answer: A,D

Explanation:
Explanation/Reference: https://www.oracle.com/technetwork/community/developer-day/mysql-replication-presentation-
485890.pdf (14)

NEW QUESTION # 42
You execute this command:
shell> mysqlpump –exclude-databases=% –users
Which statement is true?

  • A. It creates a logical backup of only the usersdatabase.
  • B. It creates a logical backup of all MySQL user accounts.
  • C. It returns an error because the mysqldumpcommand should have been used.
  • D. It creates a logical backup of all metadata, but contains no table data.

Answer: D

Explanation:
Explanation/Reference: https://docs.oracle.com/cd/E17952_01/mysql-5.7-en/mysqlpump.html

NEW QUESTION # 43
……

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