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Temp table caching improvement for table valued parameters in SQL Server 2012
I wanted to point out a nice performance improvement related to table valued parameters (TVP) in SQL Server 2012. It’s not currently documented in our online documentation. But we have had...
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switchoffset built-in function can cause incorrect cardinality estimate
Recently, we received a call from a customer reported that a query was slow. Upon further investigation, his query has a predicate that look like this:select * from t o where c1 >switchoffset...
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SQL Server 2012 partitioned table statistics update behavior change when...
In this blog, I will talk about a couple of things related to statistics update when rebuilding index on a partitioned table. In past versions, when you rebuild an index, you will get statistics update...
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System Center Advisor is now free
It has been well over a year when I wrote a series of blog posts about a product called System Center Advisor. You can read these posts at this...
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PowerPivot Table Import Wizard cannot find provider
The data source provider list in PowerPivot can often be a source of confusion for users since they equate the fact that a provider appears in the list as the provider being installed and available....
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The Case of Anti-Virus filter drive interference with File Stream Restore
"Denzil and I were working on this issue for a customer and Denzil has been gracious enough to write-up a blog for all of us." – Bob DorrFrom Denzil:I recently worked with a customer on a Database...
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SQLIOSim Checksum Validations
I had a very specific question asked of me related to the SQLIOSIM.exe, checksum validation logic. It is pretty simple logic (on purpose) but effective so here are the basics.The key is that there are...
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How It Works: Always On–When Is My Secondary Failover Ready?
I keep running into the question: “When will my secondary allow automatic failover?” Based on the question I did some extended research and I will try to summarize in is blog post. I don’t want to...
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AlwaysON - HADRON Learning Series: HADR_SYNC_COMMIT vs WRITELOG wait
The distinction between these two wait types is subtle but very helpful in tuning your Always On environment.The committing of a transaction means the log block must be written locally as well as...
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DReplay Message: “Active connections exceed 8192, connection 8409 is waiting.”
This message was an interesting dive into the DReplay, session boundary logic that I thought I would share. Internally DReplay maintains a progressive, session queue. This queue is limited to 8192...
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When Does sp_prepare Return Metadata
I was running an RML Utilities Suite test pass and encountered varying behavior from our sp_prepare suite. Here is what I uncovered.The command sp_prepare returns (or does not return) metadata...
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Tracking down Power View Performance Problems
The scenario was that we saw sluggishness on the initial load of a Power View Report and also when we went to use one of the filters on the report - like a Pie Chart Slice. For the given report the...
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After applying Service Pack 1 for SQL Server 2012 you may encounter a known...
I’d like to make you aware of an issue that may occur after installing Service Pack 1 for SQL Server 2012. Some of the symptoms are:The Windows Installer process (MSIExec.exe) repeatedly starts and...
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Error trying to access SharePoint List from Power Query
When trying to pull data from a SharePoint List Data Source, using the Microsoft Online Services ID, you may see the following output in your query:DataFormat.Error: OData: The given URL neither points...
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How It Works: SQL Server 2012 Database Engine Task Scheduling
Over the years the SQL Server scheduling algorithms have been documented in various publications. Specifically, ‘The Guru’s Guide to SQL Server Architecture and Internals’ has a chapter, written by...
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Optimizing partition split when the partition is not empty
Some of our Field Engineers, Kal Yella and Denzil Ribeiro (@DenzilRibeiro) have posted a blog that discusses how to optimize adding a partition when either the right most, or left most partition is not...
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Power View display issues with Page Viewer Web Part
I ran into two separate issues this week that both dealt with displaying a Power View report through a Page Viewer Web Part within a SharePoint page in SharePoint 2013. The resolution to both were the...
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Service status watcher in SQL Server Management Studio – How it works
Have you ever wondered about the mechanism using which SQL Server Management Studio(SSMS) - Object Explorer shows the service status for SQL Server and SQL Agent service? We recently worked with a...
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When is throttling in Windows Azure SQL Database really throttling….
During the course of this year I have spoken at several customer and internal events on troubleshooting the Windows Azure SQL Database environment. As I built my presentations, one of the confusing...
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[SQL 2012 query plan enhancement] I want to know why my query is not...
In the past, we have got repeated questions from customers on why a particular query is not parallelized. We didn’t have a good way to let customer know the reason until SQL 2012.Starting SQL Server...
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