In this article, you will learn what query optimisation statistics are and how SQL Server query optimizer uses statistics. You will also learn how to create and manage statistics, and what are the different ways to determine when statistics were last updated in SQL Server.
2013-07-10
4,410 reads
SQL Saturday is a training event for SQL Server professionals and those wanting to learn about SQL Server. This event will be held Jul 13 2013 at Grantham-Allee 20, Sankt Augustin, Cologne/Bonn, Rheinland, 53757 , Germany.
2013-07-09 (first published: 2013-07-05)
323 reads
Forwarded records in SQL Server can cause performance issues on heap tables because the record outgrows the page and the database engine uses pointers to reference the data. The best practice is to have a clustered index on every table, however, sometimes there are cases when a clustered index is not needed.
2013-07-09
3,188 reads
The continuing drop in the price of memory has made fast in-memory OLTP increasingly viable. SQL Server 2014 allows you to migrate the most-used tables in an existing database to memory-optimized 'Hekaton' technology, but how you balance between disk tables and in-memory tables for optimum performance requires judgement and experiment.
2013-07-08
3,567 reads
This metric returns the number of check constraints that have their is_not_trusted flag set to 1 in the sys.check_constraints table. Untrusted constraints force SQL Server to construct less efficient query plans, because it doesn’t know enough about the kind of data contained in the table. This can point to a data integrity issue which should be investigated.
2013-07-08
2,585 reads
2013-07-05 (first published: 2010-11-23)
20,809 reads
A comprehensive list of trace flags for SQL Server that you can use to configure your server instance.
2013-07-05 (first published: 2010-06-03)
30,180 reads
SQL Server 2012 Integration Services introduces an innovative approach to deploying SSIS projects, known as Project Deployment Model. However, the traditional, package-based methodology remains available and supported, and, in some scenarios, it might be considered more viable, since it allows for separation of SQL Server Database Engine and SQL Server Integration Services.
2013-07-05
2,205 reads
While AlwaysOn and Columnar lookup are good enough reasons to migrate to SQL Server 2012, you need to be aware of the problems associated with certain virtualize environments.
2013-07-04
8,334 reads
Fifty years after starting the 'Art of Computer Programming', Don Knuth is still working hard at the project. It is considered amongst the "hundred or so books that shaped a century of science”. Richard Morris asks him how things are going, and to find out more about his many achievements.
2013-07-04
4,357 reads
A short blog post about an issue with Fabric Mirroring (with Azure SQL DB...
By Steve Jones
I wrote an article recently on the JSON_OBJECTAGG function, but neglected to include an...
By HeyMo0sh
After working deep in cloud operations, I’ve learned that FinOps isn’t really about dashboards...
Comments posted to this topic are about the item Creating a JSON Document I
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Comments posted to this topic are about the item Designing Database Changes Before Deployment:...
I want to create a JSON document that contains data from this table:
TeamID TeamName City YearEstablished 1 Cowboys Dallas 1960 2 Eagles Philadelphia 1933If I run this code, what is returned?
SELECT json_objectagg('Team' : TeamName)
FROM dbo.NFLTeams;
See possible answers