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NEW QUESTION: 1
You have a default installation of SQL Server that hosts an Online Transaction Processing (OLTP) application.
Users report that they experience poor overall query performance for the application.
You query the wait statistics and discover that the two top waits are CXPACKET and SOS_SCHEDULER_YIELD.
You need to modify the SQL Server settings to resolve the issue causing the poor query performance.
Which two settings should you modify? Each correct answer presents part of the solution.
A. Boost SQL Server priority
B. Minimum Memory
C. optimize for ad hoc workloads
D. max degree of parallelism (MAXDOP)
E. cost threshold for parallelism
Answer: D,E
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
You are investigating Microsoft 365 services and capabilities.
Match each scenario to its Microsoft 365 service. To answer, drag the appropriate Microsoft 365 service from the column on the left to its scenario on the right. Each Microsoft 365 service may be used once, more than once, or not at all.
NOTE: Each correct match is worth one point.
Answer:
Explanation:
NEW QUESTION: 3
You are planning to deploy log shipping for Microsoft SQL Server and store all backups on a dedicated fileshare.
You need to configure the servers to perform each log shipping step.
Which server instance should you configure to perform each action? To answer, select the appropriate server instances in the dialog box in the answer area.
Answer:
Explanation:
Explanation
Note: Before you configure log shipping, you must create a share to make the transaction log backups available to the secondary server.
SQL Server Log shipping allows you to automatically send transaction log backups from a primary database on a primary server instance to one or more secondary databases on separate secondary server instances. The transaction log backups are applied to each of the secondary databases individually. An optional third server instance, known as the monitor server, records the history and status of backup and restore operations and, optionally, raises alerts if these operations fail to occur as scheduled.
Box 1: Primary server instance.
The primary server instance runs the backup job to back up the transaction log on the primary database.
backup job: A SQL Server Agent job that performs the backup operation, logs history to the local server and the monitor server, and deletes old backup files and history information. When log shipping is enabled, the job category "Log Shipping Backup" is created on the primary server instance.
Box 2: Secondary server instance
Each of the three secondary server instances runs its own copy job to copy the primary log-backup file to its own local destination folder.
copy job: A SQL Server Agent job that copies the backup files from the primary server to a configurable destination on the secondary server and logs history on the secondary server and the monitor server. When log shipping is enabled on a database, the job category "Log Shipping Copy" is created on each secondary server in a log shipping configuration.
Box 3: Secondary server instance.
Each secondary server instance runs its own restore job to restore the log backup from the local destination folder onto the local secondary database.
restore job: A SQL Server Agent job that restores the copied backup files to the secondary databases. It logs history on the local server and the monitor server, and deletes old files and old history information. When log shipping is enabled on a database, the job category "Log Shipping Restore" is created on the secondary server instance.
References: https://docs.microsoft.com/en-us/sql/database-engine/log-shipping/about-log-shipping-sql-server