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NEW QUESTION: 1
A network administrator is expanding part of the data center in a hospital network. Three new racks of equipment need to be added, with an HP Comware 5820 series switch at the top of each rack The Comware 5820 series switch needs to connect back to two core Comware 12500 switches using 10Gb connections. The distance between the three racks and the Comware 12500 switches is approximately 40 meters: however, the network administrator is concerned about electromagnetic and other types of interferences to electrical signals.
Which solutions protect against interference and are cost-effective for this scenario? (Select two.)
A. 10GBase-2R
B. 10GBase-SR
C. 10GBase-T
D. 10GBase-ER
E. 10GBase-LX4
Answer: B,C
NEW QUESTION: 2
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 automatically changes a plan during subsequent execution of a SQL statement if there is a huge difference in optimizer estimates and execution statistics.
B. The optimizer enables monitoring for cardinality feedback after the first execution of a query.
C. The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
D. After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors are submitted to the optimizer.
E. The optimizer can re optimize a query only once using cardinality feedback.
Answer: A,B,C
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.
NEW QUESTION: 3
A. Option B
B. Option A
C. Option C
D. Option F
E. Option E
F. Option D
Answer: A,B,F
NEW QUESTION: 4
Refer to the exhibit.
To which undesirable condition can router R1 be vulnerable?
A. denial of service attacks
B. asymrnetric routing
C. man-in-the-middle attacks
D. IP address spoofing
E. unicast flooding
Answer: A