SQL Server Always On Read Only Routing Lists
With the release of SQL Server Always on came the ability to query replica’s and offload read only requests. This...
2019-02-12 (first published: 2019-01-23)
2,687 reads
vitamindba
Let’s talk SQL Server Waits: Topic 2 – CXPacket
With our effort to talk about SQL Waits we come across another common wait called CXPacket. Last week we reviewed...
2019-01-30 (first published: 2019-01-16)
2,717 reads
SQL Server Transaction Log is full due to XTP Checkpoint Error 9002, Severity 17, State 16
I want to take some time and discuss my experiences with a certain SQL Server error, error 9002. Error 9002...
2019-01-10
14,943 reads
Let’s talk SQL Server Waits: Topic 1 – SOS_SCHEDULER_YIELD
Over the next few weeks we will be reviewing some of the common SQL Server Waits. We will explain what...
2019-01-03
1,583 reads
What is the Max Degree of Parallelism setting for SQL Server?
Max Degree of Parallelism is a setting that is often changed to improve performance in SQL Server. What exactly does...
2019-01-07 (first published: 2018-12-21)
2,786 reads
Seeing WriteLog wait type on your SQL Server?
One of the more common wait types for SQL Server is called WriteLog. In its most basic form it is...
2018-12-27 (first published: 2018-12-18)
3,686 reads
Get Rid of those unused indexes!
Indexes in relational databases are very helpful and increase the speed to access data. However maintaining indexes is just as...
2018-12-11
240 reads
Enabling Query Store
Performance tuning in SQL Server is one of the main jobs a DBA has. Starting with SQL Sever 2016 a...
2018-12-05
1,255 reads
Deadlocks in a SQL Server Database
Deadlocks in SQL Server happen when 2 (maybe more) processes are fighting over a resource in the database and are...
2018-12-18 (first published: 2018-12-03)
3,245 reads
Database Stuck in Suspect Mode
My holiday week did not started off very good. I come in and find a UAT environment database in suspect...
2018-11-27
29,552 reads
Blogs
How to Clear the SSMS Cache (SSMS 21 and Later)
By SQLPals
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
Comments posted to this topic are about the item Let's Talk Certifications
The Hidden Security Risks of Role Combination in SSAS Tabular
Comments posted to this topic are about the item The Hidden Security Risks of...
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