SQL DBA Always. On scenario based interview questions and answers. One of the best known feature introduced in SQL Server 2. Real Player Gold 11 there. Always. On which makes use of existing HADR features and provide additional features like Availability Groups. This article is for SQL Server DBAs who are preparing for interviews, this include basic and advanced level SQL DBA Always. On scenario based interview questions and answers One can easily expect scenario based questions in todays technical interviews. Windows Server 2008 Administrator Interview Questions And Answers Pdf' title='Windows Server 2008 Administrator Interview Questions And Answers Pdf' />Here are the scenario based questions. Q. We have got an alert WSFC cluster service is offline. What is your action planSql server interview questions and answers for freshers and experienced, SQL Server interview questions pdf, SQL Server online test, SQL server Jobs. 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Lets dive deep into Python vs Perl debate and try to figure out the overall aspects where these two languages differentiate with one another. Brent Ozar Unlimiteds specialized experts focus on your goals, diagnose your tough database pains, and make Microsoft SQL Server faster and more reliable. The SAP Community is the quickest way for users to solve problems, learn more about SAP solutions, and invent new ways to get things done. SQL-Server-Reporting-Services-Interview-Question.jpg' alt='Windows Server 2008 Administrator Interview Questions And Answers Pdf' title='Windows Server 2008 Administrator Interview Questions And Answers Pdf' />Ans This alert is raised when the WSFC cluster is offline or in the forced quorum state. All availability groups hosted within this cluster are offline a disaster recovery action is required. Possible Reasons This issue can be caused by a cluster service issue or by the loss of the quorum in the cluster. Possible Solutions Use the Cluster Administrator tool to perform the forced quorum or disaster recovery workflow. Once WFSC is started you must re evaluate and reconfigure Node. Weight values to correctly construct a new quorum before bringing other nodes back online. Otherwise, the cluster may go back offline again. Reestablishment may require if there are any High Availability features Alwayson Availability Groups, Log Shipping, Database Mirroring using on effected nodes. Q. How to force a WSFC Windows Server Failover Cluster Cluster to start without a quorum Ans This can be done using. Failover Cluster Manager. Net. exe. Power. Shell. Here well see how this can be done using FCM. Failover Cluster Manager. Open a Failover Cluster Manager and connect to the desired cluster node to force online. In the Actions pane, click Force Cluster Start, and then click Yes Force my cluster to start. In the left pane, in the Failover Cluster Manager tree, click the cluster name. In the summary pane, confirm that the current Quorum Configuration value is Warning Cluster is running in Force. Quorum state. Q. We have got an alert Availability group is offline. Can you explain about this warning and your action plan Ans This alert is raised when the cluster resource of the availability group is offline or the availability group does not have a primary replica. Multi Serial Mega Serial. Possible Reasons The availability group is not configured with automatic failover mode. The primary replica becomes unavailable and the role of all replicas in the availability group become RESOLVING. The availability group is configured with automatic failover mode and does not complete successfully. The availability group resource in the cluster becomes offline. There is an automatic, manual, or forced failover in progress for the availability group. Possible Solutions If the SQL Server instance of the primary replica is down, restart the server and then verify that the availability group recovers to a healthy state. If the automatic failover appears to have failed, verify that the databases on the replica are synchronized with the previously known primary replica, and then failover to the primary replica. If the databases are not synchronized, select a replica with a minimum loss of data, and then recover to failover mode. If the resource in the cluster is offline while the instances of SQL Server appear to be healthy, use Failover Cluster Manager to check the cluster health or other cluster issues on the server. You can also use the Failover Cluster Manager to attempt to turn the availability group resource online. If there is a failover in progress, wait for the failover to complete. Q. We have got an alert Availability group is not ready for automatic failover. Windows Azure Programming Pdf'>Windows Azure Programming Pdf. Can you explain about this warning and your action plan Ans This alert is raised when the failover mode of the primary replica is automatic however none of the secondary replicas in the availability group are failover ready. Possible Reasons The primary replica is configured for automatic failover however, the secondary replica is not ready for automatic failover as it might be unavailable or its data synchronization state is currently not SYNCHRONIZED. Possible Solutions Verify that at least one secondary replica is configured as automatic failover. If there is not a secondary replica configured as automatic failover, update the configuration of a secondary replica to be the automatic failover target with synchronous commit. Use the policy to verify that the data is in a synchronization state and the automatic failover target is SYNCHRONIZED, and then resolve the issue at the availability replica. Q. In your environment data inserted on Primary replica but not able to see that on secondary replica. When you check that Availability is in healthy state and in most cases data reflects in a few minutes but in this case its didnt happen. Now you need to check for the bottleneck and fix the issue. Can you explain your views and workaround in this situation Ans Possible Reasons Long Running Active Transactions. High Network Latency or Low Network Throughput Causes Log Build up on the Primary Replica. Another Reporting Workload Blocks the Redo Thread from Running. Redo Thread Falls behind Due to Resource Contention. Possible Workaround Use DBCC OPENTRAN and check if there are any oldest transactions running on primary replica and see if they can be rolled back. A high DMV sys. dmhadrdatabasereplicastates value logsendqueuesize can indicate logs being held back at the primary replica. Dividing this value by logsendrate can give you a rough estimate on how soon data can be caught up on the secondary replica. Check two performance objects SQL Server Availability Replica Flow Control Time mssec and SQL Server Availability Replica Flow controlsec. Multiplying these two values shows you in the last second how much time was spent waiting for flow control to clear. The longer the flow control wait time, the lower the send rate. When the redo thread is blocked, an extended event called sqlserver. Additionally, you can query the DMV sys. REDO thread, and then you can take corrective action. You can let the reporting workload to finish, at which point the redo thread is unblocked. You can unblock the redo thread immediately by executing the KILL command on the blocking session ID. The following query returns the session ID of the reporting workload that is blocking the redo thread. Transact SQLSelect sessionid, command, blockingsessionid, waittime, waittype, waitresourcefrom sys. DB STARTUPWhen Redo Thread Falls Behind Due to Resource Contention a large reporting workload on the secondary replica has slowed down the performance of the secondary replica, and the redo thread has fallen behind. You can use the following DMV query to see how far the redo thread has fallen behind, by measuring the difference between the gap between lastredonelsn and lastreceivedlsn. Transact SQLSelect recoverylsn, truncationlsn, lasthardenedlsn,lastreceivedlsn, lastredonelsn, lastredonetimefrom sys. If you see thread is indeed failing behind, do a proper investigation and take the help of resource governor and can control the CPU cycles. Note Have a look at MSDN sites and try to understand these solutions because when you say possible solutions, immediately you might be asked about resolutions. How to Force Remove Item to Delete Items and Suppress the Confirmation Prompt in Windows Power. Shell. The Problem In Windows Powershell, deleting items with Remove Item causes a confirmation prompt to stop a script from functioning. The prompt says Confirm. The item at path has children and the Recurse parameter was not specified. If you continue, all children will be removed with the item. Areyou sure you want to continue Y Yes A Yes to All N No L No to All S Suspend Help default is YThe Solution Run Remove Item with the recurse switch. Remove Item C pathtofile recurse. Remove Item C pathtofile recurse. Now your script will run with no intervention necessary. The Long Story There is considerable confusion about how to supress confirmation prompts with Remove Item. Its rather silly since the solution is right in the confirmation wording I am guilty of being silly since I didnt see that at first either. Here are some false ways of performing this task along with why they are false Using the Confirm parameter. Some people will suggest that you use the following line Remove Item c pathtofile Confirm false. Remove Item c pathtofile Confirm false. However, confirm is set to false by default and furthermore it has nothing to do with the warning above. The confirm parameter prompts you for confirmation before executing the command. In the above scenario, Im not being prompted before running the command, Im being prompted to confirm the deletion of a file that has child objects. For more information abuot the confirm parameter, run the following command in a Power. Shell prompt get help aboutCommon. Parametersget help aboutCommon. Parameters. Using the force switch. This does not force the Remove Item cmdlet to delete files in the face of a confirmation prompt. This forces the deletion of hidden and read only items.