What's the Quarantine state in Windows Failover Clusters
In this article we cover why Windows Failover Cluster nodes can go into a quarantined state, how to resolve this as well as how to set threshold values for this cluster node state.
2021-02-08
Clustering
Preferred Node Policy-Setting on Traditional SQL Cluster
Preferred node setting facilitates instances on traditional cluster to be on the correct nodes which will lead to load-balancing of the resources.
2017-02-02
4,163 reads
Change the Collation Setting for Clustered SQL Server 2014 Instance
In this post I will show a procedure to change collation settings of SQL Server 2014 cluster instance.
2016-11-24
3,495 reads
SQL Server Restart or Cluster Failover Notification
How to create an automatic SQL restart or failover notification.
2018-06-22 (first published: 2015-12-10)
10,423 reads
How to Add a Drive as a Clustered Physical Disk Resource in Windows
This article is covers how to add a drive as a Clustered Physical Disk Resource in Windows 2003.
2015-11-09
6,690 reads
2015-07-17
1,383 reads
Managing MaxMemory Values on an Active-Active Two Node Cluster
How to manage your MaxMemory values on an Active-Active two node cluster.
2013-10-24
3,976 reads
Error during installation of an SQL server Failover Cluster Instance
A common issue I've run into while helping with SQL Server Failover Cluster (FCI) installations is the failure of the Network Name. In the following post I'll discuss a bit of background, the common root cause, and how to resolve it.
2013-10-16
2,239 reads
Monitor SQL Instance Balance across Windows Cluster Nodes Using PowerShell
This tip will demonstrate how to monitor SQL Failover Cluster Instances if they become unbalanced using Windows PowerShell.
2013-05-03
2,597 reads
Migration Guide: Migrating to SQL Server 2012 Failover Clustering and Availability Groups from Prior Clustering and Mirroring Deployments
This paper provides guidance for customers who prior to SQL Server 2012 have deployed SQL Failover Clustering for local high availability and database mirroring for disaster recovery, and who want to migrate to SQL Server AlwaysOn. It describes the corresponding SQL Server AlwaysOn scenario and the migration paths to SQL Server AlwaysOn. It also contains the important knowledge and considerations that you must know in order to successfully migrate to a HADR solution based on SQL Server AlwaysOn technology, which implements AlwaysOn Failover Cluster Instances for high availability and AlwaysOn Availability Groups for disaster recovery.
2012-04-13
2,738 reads
Blogs
How to Clear the SSMS Cache (SSMS 21 and Later)
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How to Clear the SSMS Cache (SSMS 21 and Later) Updated...
The flight recorder: Replaying what an AI agent did on my SQL Server
By Arun Sirpal
“What exactly did it do on my server?” is the first question a DBA...
Announcements from the Microsoft Fabric Community Conference — Barcelona 2026
By James Serra
Microsoft shared a broad set of Fabric, Power BI, and SQL updates at FabCon...
Forums
Let's Talk Certifications
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The Hidden Security Risks of Role Combination in SSAS Tabular
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The Empty Aggregate
Comments posted to this topic are about the item The Empty Aggregate
Question of the Day
The Empty Aggregate
I have this table in a SQL Server 2025 database:
CREATE TABLE [dbo].[CustomerOrder] ( [OrderID] [int] NULL, [CustomerID] [int] NULL, [total] [money] NULL ) ON [PRIMARY] GOWhat is returned from this code? (answers are for the sum and then the count)
SELECT SUM(total) AS sum,
COUNT(total) AS count
FROM dbo.CustomerOrder;
See possible answers