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NEW QUESTION: 1
For additional processing capacity, tasks nodes can be added on demand on EMR.
Choose the correct answer:
A. True
B. False
Answer: A
Explanation:
The number of instances to use in your cluster is application dependent and should be based on both the number of resources required to store and process your data and the acceptable amount of time for your job to complete. As a general guideline, we recommend that you limit 60% of your disk space to storing the data you will be processing, leaving the rest for intermediate output.
Hence, given 3x replication on HDFS, if you were looking to process 5 TB on m1.xlarge instances, which have 1,690 GB of disk space, we recommend your cluster contains at least (5 TB * 3) / (1,690 GB * .6) = 15 m1.xlarge core nodes. You may want to increase this number if your job generates a high amount of intermediate data or has significant I/O requirements. You may also want to include additional task nodes to improve processing performance Reference:
https://aws.amazon.com/emr/faqs/
NEW QUESTION: 2
注：この質問は、同じシナリオを使用する一連の質問の一部です。便宜上、質問ごとにシナリオが繰り返されます。各質問には異なる目標と回答の選択肢がありますが、このシリーズの各質問では次のシナリオはまったく同じです。
繰り返されるシナリオの開始
Contoso、Ltd.には、カスタムアプリケーションをサポートするMicrosoft SQL Serverデータベースがあります。現在のSQL Server環境は、ContosoSQL1とContosoSQL2の2つのサーバーで構成されています。これら2つのサーバーは、自動フェールオーバーで同期コミットを使用するように構成されたContosoAG1という名前のAlways On可用性グループに参加します。セカンダリレプリカは読み取り専用アクセス用に構成されていません。
アプリケーションは、ContosoDBという名前のデータベースでトランザクション処理と履歴データ取得の両方を実行します。アプリケーションには、在庫管理モジュールが含まれています。インベントリ管理モジュールとデータベースでパフォーマンスの問題が発生しています。
ユーザーは、InventoryQuery1という名前のクエリの完了に時間がかかると報告しています。クエリは次のように表示されます。
SELECT ProductNumber、Name、ProductLine
FROM Production.Product
WHERE ProductNumber = N '<特定の製品>'
このクエリに対してSQL Serverが使用するクエリプランは、展示に示されています。 （[展示]タブをクリックします。）頻繁に長期にわたってブロックされるエピソードなど、さまざまなパフォーマンスの問題により、ビジネスユーザーは日常のタスクを完了できません。 tempdbデータベースリソースが原因であると思われます。問題を特定するには、ContosoDBデータベースのブロッキングレポートを作成する必要があります。
示す。
拡張イベントを使用して、ContosoSQL1インスタンスに対して実行されるすべてのTransact-SQLステートメントを確認する予定です。拡張イベントセッションからの出力には、開始イベントと停止イベントの両方が含まれている必要があり、ファイルに書き込む必要があります。データ損失の可能性を最小限に抑え、サーバーのパフォーマンスへの影響を減らすために、拡張イベントセッションを構成する必要があります。
ContosoSQL3という名前の追加のセカンダリレプリカをContosoAG1に展開する予定です。読み取り専用トラフィックは、どのインスタンスがプライマリレプリカであるかに関係なく、2つのセカンダリレプリカ間で負荷分散する必要があります。
Contosoは、トランザクションデータベースからのリアルタイムデータに依存する専用のレポートシステムを追加する予定です。
同社は、高可用性/災害復旧（HA / DR）ソリューションの改善を計画しています。計画的な改善の一環として、ContosoSQL1からすべてのデータベースをオフサイトの場所に直接バックアップします。
繰り返されるシナリオの終わり
ContosoSQL1のバックアッププロセスを構成する必要があります。
あなたは何をするべきか？
A. 復旧モデルをシンプルに設定する
B. 新しいバックアップセットを作成します。
C. テープデバイスへのバックアップを実行する
D. DRデータセンターへのミラー化されたバックアップを実行します。
Answer: D
Explanation:
Explanation
Scenario:
The company plans to improve their high availability/disaster recovery (HA/DR) solution. As part of the planned improvements, you will back up all databases from ContosoSQL1 directly to an off-site location.
One of the features found in the Enterprise Edition of SQL Server is the ability to take mirrored backups.
Basically, taking a mirrored backup means creating additional copies of the backup media (up to three) using a single BACKUP command, eliminating the need to perform the copies with copy or robocopy.
The idea behind is that you can backup to multiple locations and increase the protection level by having additional copies of the backup set. In case one of the copies gets lost or corrupted, you can use the mirrored copy to perform a restore.
Another possible scenario for a mirrored backup is deferred tape migration: you can backup to a local disk and mirror to a shared folder on a file server. That way you could have a local copy of the backup set and restore it in case of need and let the mirrored copy migrate to tape when the disk backup software processes the file server's disks.
References:
https://www.mssqltips.com/sqlservertip/1779/mirrored-database-backup-feature-in-sql-server-2005-and-sql-serv
NEW QUESTION: 3
Which Cisco technology using Nexus NX-OS infrastructure allows the network architect to create up to four separate control and data plane instances of the Nexus chassis?
A. virtual switching system
B. virtual device context
C. virtual port-channel
D. virtual routing and forwarding
Answer: B
Explanation:
Explanation/Reference:
Explanation:
Virtualization
Virtual local-area network (VLAN), virtual storage-area network (VSAN), and virtual device contexts (VDC) help to segment the LAN, SAN, and network devices instances. Cisco Nexus 1000V virtual switch for VMware ESX and ESXi help to deliver visibility and policy control for virtual machines (VM).
Flexible networking options with support for all server form factors and vendors, including support for blade servers from Cisco, Dell, IBM, and HP with integrated Ethernet and Fibre Channel switches.
NEW QUESTION: 4
Which of the following are threats to network security?
Each correct answer represents a complete solution. Choose two.
A. Dial-up connections
B. Disabled user accounts
C. Events auditing
D. Rogue employees
Answer: A,D