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NEW QUESTION: 1
A. cost threshold for parallelism
B. optimize for ad hoc workloads
C. max degree of parallelism (MAXDOP)
D. Boost SQL Server priority
E. Minimum Memory
Answer: A,C
Explanation:
Explanation
A: Lower the MAXDOP.
When high CXPACKET values are encountered, a possible issue, even in case when parallelism is evenly distributed, is when the cost of creating the parallel plan is higher than the cost of the serialized thread. This is often something that is overlooked and by the rule of thumb of reaching for altering of the Max Degree of Parallelism (MAXDOP), by setting it to 1 (each and every query will be processed by the single CPU core).
Configuring MAXDOP settings to 1 should be the last resource used in troubleshooting excessive CXPACKET wait times.
When a high CXPACKET value is accompanied with a LATCH_XX and with PAGEIOLATCH_XX or SOS_SCHEDULER_YIELD, it is an indicator that slow/inefficient parallelism itself is the actual root cause of the performance issues. And in such a scenario if the LATCH_XX waits is ACCESS_METHODS_DATASET_PARENT or ACCESS_METHODS_SCAN_RANGE_GENERATOR class, then it is highly possible that the parallelism level is the bottleneck and the actual root cause of the query performance issue. This is a typical example when MAXDOP should be reduced.
E: The Cost Threshold for Parallelism (CTFP) value is in seconds and it means that for every query for which SQL Server estimates that running time will be longer than 5 seconds, a parallel plan will be created.
To prevent unwanted parallelism, the CTFP number could be increased and by the aforementioned rule of thumb, a minimum value of 25. Recent analysis indicates that 50 should be the optimal minimal number for modern computers.
References: https://www.sqlshack.com/troubleshooting-the-cxpacket-wait-type-in-sql-server/
NEW QUESTION: 2
会社には、Amazon S3の後半にあるデータがあり、多くのAWSアカウントの何百ものアプリケーションからアクセスする必要があります。同社の情報セキュリティポリシーでは、S3バケットは公共のインターネット経由でアクセスしてはならず、各アプリケーションは機能するために必要な最小限の権限を持っている必要があると述べています。
これらの要件を満たすために、ソリューションアーキテクトは、各アプリケーションの特定のVPCに制限されたS3アクセスポイントの使用を計画しています。
ソリューションアーキテクトがこのソリューションを実装するために実行する必要がある手順の組み合わせはどれですか。 (2つ選択)
A. 各AWSアカウントのアプリケーションごとにS3アクセスポイントを作成し、アクセスポイントをS3バケットに接続します。アプリケーションのVPCからのみアクセスできるように各アクセスポイントを構成し、アクセスポイントからのアクセスを要求するようにバケットポリシーを更新します。
B. 各アプリケーションのVPCにAmazon S3のインターフェイスエンドポイントを作成します。 S3アクセスポイントへのアクセスを許可するようにエンドポイントポリシーを設定します。 S3エンドポイントのVPCゲートウェイアタッチメントを作成します。
C. 各アプリケーションのVPCにAmazon S3のゲートウェイエンドポイントを作成します。 S3アクセスポイントへのアクセスを許可するようにエンドポイントポリシーを設定します。アクセスポイントへのアクセスに使用するルートテーブルを指定します。
D. データレイクのVPCにAmazon S3のゲートウェイエンドポイントを作成します。エンドポイントポリシーをアタッチして、S3バケットへのアクセスを許可します。バケットへのアクセスに使用されるルートテーブルを指定します。
E. S3バケットを所有するAWSアカウントの各アプリケーションにS3アクセスポイントを作成します。アプリケーションのVPCからのみアクセスできるように各アクセスポイントを構成します。アクセスポイントからのアクセスを要求するようにバケットポリシーを更新します。
Answer: C,E
NEW QUESTION: 3
What is a cause for unicast flooding?
A. A man-in-the-middle attack can cause the ARP cache of an end host to have the wrong MAC address.
Instead of having the MAC address of the default gateway, it has a MAC address of the man-in-the- middle. This causes all traffic to be unicast flooded through the man-in-the-middle, which can then sniff all packets.
B. Forwarding table overflow prevents new MAC addresses from being learned, and packets destined to those MAC addresses are flooded until space becomes available in the forwarding table.
C. Unicast flooding occurs when multicast traffic arrives on a Layer 2 switch that has directly connected multicast receivers.
D. When PIM snooping is not enabled, unicast flooding occurs on the switch that interconnects the PIM- enabled routers.
Answer: B
Explanation:
Explanation/Reference:
Explanation:
Causes of Flooding
The very cause of flooding is that destination MAC address of the packet is not in the L2 forwarding table of the switch. In this case the packet will be flooded out of all forwarding ports in its VLAN (except the port it was received on). Below case studies display most common reasons for destination MAC address not being known to the switch.
Cause 1: Asymmetric Routing
Large amounts of flooded traffic might saturate low-bandwidth links causing network performance issues or complete connectivity outage to devices connected across such low-bandwidth links Cause 2:
Spanning-Tree Protocol Topology Changes
Another common issue caused by flooding is Spanning-Tree Protocol (STP) Topology Change Notification (TCN). TCN is designed to correct forwarding tables after the forwarding topology has changed. This is necessary to avoid a connectivity outage, as after a topology change some destinations previously accessible via particular ports might become accessible via different ports. TCN operates by shortening the forwarding table aging time, such that if the address is not relearned, it will age out and flooding will occur Cause 3: Forwarding Table Overflow Another possible cause of flooding can be overflow of the switch forwarding table. In this case, new addresses cannot be learned and packets destined to such addresses are flooded until some space becomes available in the forwarding table. New addresses will then be learned. This is possible but rare, since most modern switches have large enough forwarding tables to accommodate MAC addresses for most designs.
Reference: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6000-series-switches/23563-
143.html