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NEW QUESTION: 1
Which one of the following best describes Progressive discipline?
A. Discussion of substandard performance, verbal warning, written warning, and final written warning.
B. Series of documents of employee's substandard performance prior to each step of discipline or termination.
C. Discussion of substandard performance, written warning, final written warning, termination.
D. Series of documents of employee's incompetence or insubordination that precedes an employee's termination.
Answer: A

NEW QUESTION: 2
Select and Place:

Answer:
Explanation:

NEW QUESTION: 3
XPathを使用してXMLドキュメントの任意の部分にアクセスまたは参照することを規定する仕様を選択します。
A. DTD
B. XML
C. XSLT
D. XMLW Courier NewlrZの名前空間
Answer: C

NEW QUESTION: 4
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 can re optimize a query only once using cardinality feedback.
B. After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors are submitted to the optimizer.
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. The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
Answer: C,D,E
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.