DBA Database scripts are on Github
It started with a tweet from Dusty
The second session I presented at the fantastic PowerShell Conference Europe was about using the...
2016-05-16
819 reads
SQL Server – Change in Identity() Property during transactions
Recently while working on a scenario I found that in case of transaction if you are doing insertion operation on...
2016-05-16
564 reads
Tempdb Metadata Contention in SQL Server – Table Variable Vs Temporary Table
In SQL Server, the concurrent creation of temporary tables from many sessions can lead to tempdb metadata contention. Tempdb metadata contention does not affect the concurrent creation of table...
2016-05-15
31 reads
AlwaysOn Availability Groups Synchronous Replica Readable Secondary Data Access Latency
With SQL Server AlwaysOn Availability Groups, when you configure a secondary in synchronous-commit mode for read-only access, there can be data access latency. If you make changes to your...
2016-05-15
25 reads
Seek or Scan – Cost Based Optimizer in SQL Server
When SQL Server has a choice of plans, it will compare the cost among a set of execution plans and will choose the cheapest one. In some cases, even...
2016-05-15
45 reads
Optimize for Ad Hoc Workloads – SQL Server Configuration Parameter
SQL Server configuration parameter “optimized for ad hoc workloads” can be very useful when you execute lots of single use ad hoc statements or dynamic SQL statements by reducing...
2016-05-15
35 reads
Extended Event Locks Lock Waits in SQL Server
When it comes to lock waits, one of the important information we need to know is which statement waited for locks and how long. This is possible with extended...
2016-05-15
139 reads
Extended Event Query Post Execution Showplan in SQL Server
Query Post Execution Showplan event is a very useful event to find problematic queries and execution plans based on CPU usage or duration while analyzing performance issues. It can...
2016-05-15
70 reads
PAGELATCH Waits with Update Statements in SQL Server – PAGELATCH_EX and PAGELATCH_SH
In SQL Server, concurrent writes or read / write to the same page can lead to PAGELATCH (like PAGELATCH_EX and PAGELATCH_SH) waits or what is knowns as PAGELATCH contention....
2016-05-15
59 reads
Tempdb Allocation Contention in SQL Server
In SQL Server, the concurrent creation of temporary objects (temporary tables and table variables) from many sessions can lead to tempdb allocation contention. This contention occurs on PFS and...
2016-05-15
38 reads
Blogs
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...
Au Revoir for now
By Steve Jones
No, I’m not quitting or retiring. Just going on vacation, but I leave tonight...
Forums
Let's Talk Certifications
Comments posted to this topic are about the item Let's Talk Certifications, which is...
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