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NEW QUESTION: 1
An access point generates a 4 W signal; it is equipped with a cable that has a loss of 3 dB and an antenna with a gain of 10 dB. What is the power radiated to the air?
A. 2 W
B. 40 W
C. 10 W
D. 20 W
Answer: D
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 does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
B. The optimizer can re optimize a query only once using cardinality feedback.
C. The optimizer enables monitoring for cardinality feedback after the first execution of a query.
D. 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.
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.
NEW QUESTION: 3
When a stop-loss/profit order is taken, the rate specified in the order:
A. cannot be taken as a fixed-price guarantee unless agreed in writing
B. will always be the stop loss rate, if the order is executed
C. must be transacted if a broker confirms that the specified rate was reached
D. must be transacted regardless of where the market moved
Answer: A
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