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NEW QUESTION: 1
Which of the following statements about the InfoLink feature of the OceanStor 9000 are correct? (Select two.)
A. If clients attempt to access the OceanStor 9000 using domain names, a DNS server must be configured.
B. If a node becomes faulty, the system provides the failover function. This function does not need the InfoLink license to be activated.
C. After the InfoLink license is activated, the system balances loads based on round robin, CPU usage, number of node connections, node throughput, and comprehensive node loads.
D. If clients attempt to access the OceanStor 9000 using domain names, the InfoLink license must be activated.
Answer: C,D

NEW QUESTION: 2
An administrator is troubleshooting a virtual machine that has unexpectedly powered off.
Which two logs should be used to troubleshoot the issue? (Choose two.)
A. vpxa.log
B. vmware.log
C. hostd.log
D. shell.log
Answer: B,C

NEW QUESTION: 3
Examine the parameters for your database instance:

Which three statements are true about the process of automatic optimization by using cardinality
feedback? (Choose three.)
A. The optimizer enables monitoring for cardinality feedback after the first execution of a query.
B. The optimizer can re optimize a query only once using cardinality feedback.
C. The optimizer automatically changes a plan during subsequent execution of a SQL statement if there is
a huge difference in optimizer estimates and execution statistics.
D. The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are
enabled.
E. After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors
are submitted to the optimizer.
Answer: A,C,D
Explanation:
Explanation/Reference:
Explanation:
C: During the first execution of a SQL statement, an execution plan is generated as usual.
D: if multi-column statistics are not present for the relevant combination of columns, the optimizer can fall
back on cardinality feedback.
(not B)* Cardinality feedback. This feature, enabled by default in 11.2, is intended to improve plans for
repeated executions.
optimizer_dynamic_sampling
optimizer_features_enable
* dynamic sampling or multi-column statistics allow the optimizer to more accurately estimate selectivity of
conjunctive predicates.
Note:
* OPTIMIZER_DYNAMIC_SAMPLING controls the level of dynamic sampling performed by the optimizer.
Range of values. 0 to 10
* Cardinality feedback was introduced in Oracle Database 11gR2. The purpose of this feature is to
automatically improve plans for queries that are executed repeatedly, for which the optimizer does not
estimate cardinalities in the plan properly. The optimizer may misestimate cardinalities for a variety of
reasons, such as missing or inaccurate statistics, or complex predicates. Whatever the reason for the
misestimate, cardinality feedback may be able to help.