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NEW QUESTION: 1
Examine the parameters for your database instance:

Which three statements are true about the process of automatic optimization by using cardinality feedback?
A. 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.
B. The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
C. The optimizer can re optimize a query only once using cardinality feedback.
D. After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors are submitted to the optimizer.
E. The optimizer enables monitoring for cardinality feedback after the first execution of a query.
Answer: A,B,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.

NEW QUESTION: 2
データソースから新規および変更されたレコードを増分ロードするために、Microsoft SQL Server統合サービス（SSIS）パッケージを開発しています。
SSISパッケージは、Table1に新しいレコードをロードし、Table1_Updatesに更新されたレコードをロードする必要があります。 レコードをロードした後、パッケージは既存のビジネスロジックに従って更新されたローを処理するためにTransact-SQLステートメントを呼び出す必要があります。
SSISパッケージのデザインを完成させる必要があります。
どのタスクを使うべきですか？ 回答するには、適切なSSISオブジェクトを正しいターゲットにドラッグします。 各SSISオブジェクトは、1回、複数回、またはまったく使用されない可能性があります。 コンテンツを表示するには、ペイン間の分割バーをドラッグするか、スクロールする必要があります。
注：それぞれ正しい選択は1ポイントの価値があります。

Answer:
Explanation:

Explanation

Step 1: CDC Control Task Get Processing Range
Step 2: Mark Processed Range
Step 3: Data Flow
The Data Flow task encapsulates the data flow engine that moves data between sources and destinations, and lets the user transform, clean, and modify data as it is moved. Addition of a Data Flow task to a package control flow makes it possible for the package to extract, transform, and load data.
Step 4: CDC Source
The CDC source reads a range of change data from SQL Server 2017 change tables and delivers the changes downstream to other SSIS component.
Step 5: CDC Splitter
The CDC splitter splits a single flow of change rows from a CDC source data flow into different data flows for Insert, Update and Delete operations.
References:
https://docs.microsoft.com/en-us/sql/integration-services/control-flow/cdc-control-task
https://docs.microsoft.com/en-us/sql/integration-services/control-flow/data-flow-task
https://docs.microsoft.com/en-us/sql/integration-services/data-flow/cdc-splitter?view=sql-server-2017

NEW QUESTION: 3
People who slow down "to take a look" when they drive past a collision scene:
A. Are helping emergency crews by going more slowly
B. Can learn, in this way, how to avoid a collision
C. Add to the traffic slow down and may cause additional collisions
Answer: C