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NEW QUESTION: 1
A database named TEST was created and two buffer pools named BP_GENERAL and BP_AUDITING were created as follows:
The majority of the database tables were created in table space TS1, while one large table was created in table space TS2. A set of triggers that would populate the table in table space TS2 each time changes were made to the database were then defined and the database was put into production. At first, ad-hoc queries performing random I/O against the table in table space TS2 ran fine, but performance has gotten worse as the table has gotten larger. What should be done to improve query performance?
A. Change the page size of the BP_AUDITING buffer pool to 16 or 32 K.
B. Increase the size of the BP_AUDITING buffer pool.
C. Replace the BP_AUDITING buffer pool with a block-based buffer pool.
D. Reduce the size of the BP_AUDITING buffer pool.
Answer: D
NEW QUESTION: 2
A network administrator in the IT department sets a new AP access security policy to enforce these requirements:
All new Aruba APs that are in subnet 10.1.0/24 only can automatically join the Aruba master controller
in another subnet.
The APs are automatically set to AM mode.
All management traffic is protected in an encrypted tunnel.
In subnet 10.1.0/24, there are also many Cisco APs that use the DHCP option to register with the Cisco WLC controller.
Which steps should the network administrator take to implement the policy based on the requirements?
(Choose two.)
A. Disable CPsec and create a CAP whitelist for the new APs.
B. Configure the DNS A-record for an AP discovering controller.
C. Configure the DHCP option 43 for an Aruba AP.
D. Change the DHCP option 60 for an Aruba AP.
E. Change the AP radio's operation mode to AM mode in the default AP-group.
Answer: D,E
NEW QUESTION: 3
dbo.Salesという名前のテーブルを含むデータベースがあります。 テーブルには20億行あります。 次のTransact-SQLステートメントを実行してテーブルを作成しました。
dbo.Salesに対して次のクエリを実行します。 すべてのクエリはパフォーマンスがよくありません。
テーブルにデータを入力するETLプロセスは、一括挿入を使用して毎日1000万行をロードします。 このプロセスでは現在、レコードをロードするのに6時間かかります。
払い戻し列の値は、テーブル内の行の0.01%のみに対して1に等しくなります。 他のすべての行では、返金列の値は0です。
クエリとETLプロセスのパフォーマンスを最大限に高める必要があります。
各クエリにどのインデックスタイプを使用しますか? 回答するには、回答領域で適切なインデックスの種類を選択します。
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
Query1: Nonclustered Index
The query include a date range.
If you have included columns in your index, then the leaf level page of your non-clustered index contains the columns as defined in the nonclustered index the clustering key column(s) all those additional columns as defined in your INCLUDE statement.
Query2: Clustered columnstore index
Columnstore index is a new type of index introduced in SQL Server 2012. It is a column-based non-clustered index geared toward increasing query performance for workloads that involve large amounts of data, typically found in data warehouse fact tables.
Query3: Filtered nonclustered index
* When a column only has a small number of relevant values for queries, you can create a filtered index on the subset of values. For example, when the values in a column are mostly NULL and the query selects only from the non-NULL values, you can create a filtered index for the non-NULL data rows. The resulting index will be smaller and cost less to maintain than a full-table nonclustered index defined on the same key columns.
When a table has heterogeneous data rows, you can create a filtered index for one or more categories of data.
This can improve the performance of queries on these data rows by narrowing the focus of a query to a specific area of the table. Again, the resulting index will be smaller and cost less to maintain than a full-table nonclustered index.
References:
https://docs.microsoft.com/en-us/sql/relational-databases/indexes/create-filtered-indexes
https://logicalread.com/sql-server-columnstore-index-w02/#.XRo06egzaUk