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最新的 MySQL Database Administration 1Z0-908 免費考試真題 (Q61-Q66):

問題 #61
Which statement is true about InnoDB persistent index statistics?

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

答案：D

問題 #62
Examine the modified output:

Seconds_Behind_ Master value is steadily growing. What are two possible causes? (Choose two.)

A. The master is most probably too busy to transmit data and the slave needs to wait for more data.
B. The parallel slave threads are experiencing lock contention.
C. This value shows only I/O latency and is not indicative of the size of the transaction queue.
D. One or more large tables do not have primary keys.
E. The master is producing a large volume of events in parallel but the slave is processing them serially.

答案：C,E

問題 #63
There are five MySQL instances configured with a working group replication.
Examine the output of the group members:

Which two statements are true about network partitioning in the cluster? (Choose two.)

A. There could be both a 2 node and 3 node group replication still running, so shutting down group replication and diagnosing the issue is recommended.
B. The cluster has built-in high availability and updates group_replication_ip_whitelistto remove the unreachable nodes.
C. The cluster will shut down to preserve data consistency.
D. A manual intervention to force group members to be only the working two instances is required.
E. The group replication will buffer the transactions on the online nodes until the unreachable nodes return online.

答案：B,C

問題 #64
Which two MySQL Shell commands are excluded from the InnoDB Cluster creation procedure? (Choose two.)

A. cluster.addInstance()
B. dba.configureLocalInstance()
C. dba.createCluster()
D. dba.configureInstance()
E. dba.checkInstanceConfiguration()
F. cluster.forceQuorumUsingPartitionOf()
G. cluster.setPrimaryInstance()

答案：F,G

解題說明：
Explanation/Reference: https://docs.oracle.com/cd/E17952_01/mysql-shell-8.0-relnotes-en/news-8-0-16.html

問題 #65
Which two are valid uses for binary logs on a MySQL instance? (Choose two.)

A. audit of all queries
B. recording the order in which queries are issued
C. point-in-time recovery
D. replication
E. logging the duration and locks for all queries

答案：B,C

問題 #66
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