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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. 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。
B. 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。
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。
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
A network administrator is troubleshooting an issue with unstable wireless connections in a residence hall.
Students on the first and second floors are reporting the hall's SSID is not visible in the evenings. The
network administrator has verified the wireless system is operating normally.
Which of the following is the MOST likely cause for the problem reported by students?
A. The SSID is set to hidden.
B. An ARP attack is underway.
C. A jammer is being used.
D. Internet router maintenance is scheduled.
Answer: D
NEW QUESTION: 3
Which three allocate memory per thread in MySQL? (Choose three.)
A. sort buffer
B. read buffer
C. internal temporary table
D. thread cache
E. InnoDB buffer pool instance
F. query cache
Answer: A,B,E
NEW QUESTION: 4
A customer wants to mount their new E870 in an existing 1 9 inch rack.
What should be considered during the sales process?
A. The system only ships with an IBM rack.
B. The system only fits in a 24 inch rack.
C. The system only fits in specific IBM racks. Non IBM racks are not permitted to be used.
D. The system only ships without a rack if the proper feature is specified on the order.
Answer: C
