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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ます:
NAMETYPEVALUE
optimizer_adaptive_reporting_onlybooleanFALSE
optimizer_capture_sql_plan_baselinesbooleanFALSE
optimizer_dynamic_samplinginteger2
optimizer_features_enablestring12.1.0.1
どの3つのステートメントは統計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マルチカラム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。
C. 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文の後続の実行中に計画を変更します。
D. オプティマイザは一度基数のフィードバックを使用してのみクエリを再最適化することができます。
E. 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。
Answer: A,B,C
Explanation:
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
Which field in the IP routing table contains the name or address of the neighbour that advertised the prefix to the router?
A. Next hop.
B. Dest prefix.
C. Preference.
D. Metric.
Answer: A
Explanation:
Topic 2, Volume B
NEW QUESTION: 3
You access the Deployments page from the Administration Console. The targets and state of each
application are displayed. One web application named web1is targeted to server1 and is in the NEW
state.
Which statement is true?
A. server1is in standby mode
B. web1is in the process of being deployed to server1
C. web1is available but has never been accessed
D. server1is not running
Answer: B