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NEW QUESTION: 1
データベース・インスタンスのパラメータを確認してください:

どの3つのステートメントはカーディナリティのフィードバックを使用して、自動最適化のプロセスについて真ですか。
A. 動的サンプリングと複数列の統計情報が有効になっている場合、オプティマイザは基数のフィードバックを監視しません。
B. オプティマイザは基数のフィードバックを一度使用するだけにクエリを再最適化することができます。
C. オプティマイザはクエリの最初の実行後にカーディナリティフィードバックの監視を可能にします。
D. オプティマイザが再最適化の候補としてクエリを特定した後、コレクターによって収集された統計はオプティマイザに提出されています。
E. オプティマイザの推定と実行統計に大きな差がある場合、オプティマイザは自動的にSQL文の次の実行中に計画を変更します。
Answer: A,C,E
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: 2
Over the previous four weeks, a work center produced 120, 130, 150,140 standard hours of work. What is the demonstrated capacity of the work center?
A. 140 standard hours
B. 139 standard hours
C. 130 standard hours
D. 135 standard hours
Answer: D

NEW QUESTION: 3
What is the maximum number of security zones supported by the Eudemon?
A. 0
B. 1
C. 2
D. 3
Answer: B