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NEW QUESTION: 1
ネットワークエンジニアがアクセスポイントに高可用性を設定しています。構成できるコントローラーの最大数はいくつですか？
A. 0
B. 1
C. 2
D. 3
Answer: A

NEW QUESTION: 2



A. Option E
B. Option A
C. Option D
D. Option B
E. Option C
Answer: B,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: 3
You have several SQL Server queries.
You plan to optimize the queries to improve performance.
You run the queries in SQL Server Management Studio.
You need to compare query runs to expose the indexing issues of the queries.
Which three actions should you perform from SQL Server Management Studio? Each correct answer presents part of the solution.
A. Enable the Debug option.
B. Add the STATISTICS TIME execution setting to the query.
C. Add the STATISTICS IO execution setting to the query.
D. Add the STATISTICS PROFILE execution setting to the query.
E. Enable the Include Actual Execution Plan option.
Answer: B,C,E
Explanation:
Explanation
E: An execution plan is theresult of the query optimizer's attempt to calculate the most efficient way to implement the request represented by the T-SQL query you submitted. To generate the first execution plan, you can enable the Include Actual Execution Plan option.
B: SET STATISTICS TIME displays the number of milliseconds required to parse, compile, and execute each statement.
C: STATISTICS IO causes SQL Server to display information regarding the amount of disk activity generated by Transact-SQL statements. This is useful information for optimizing queries.
The information include Scan count:
Number of seeks/scans started after reaching the leaf level in any direction to retrieve all the values to construct the final dataset for the output.
Scan count is 0 if the index used is a unique index or clustered index on a primary key and you are seeking for only one value. For example WHERE Primary_Key_Column = <value>.
Scant count is 1 when you are searching for one value using a non-unique clustered index which is defined on anon-primary key column. This is done to check for duplicate values for the keyvalue that you are searching for. For example WHERE Clustered_Index_Key_Column = <value>.
Scan count is N when N is the number of different seek/scan started towards the leftor right side at the leaf level after locating a key value using the index key.