The Query Optimiser needs a good estimate of the number of rows likely to be returned by each physical operator in order to select the best query plan from the most likely alternatives. Sometimes these estimates can go so wildly wrong as to result in a very slow query. Joe Sack shows how it can happen with SQL Queries on a data warehouse with a star schema.
2012-12-10
1,163 reads
Occasionally, when deploying a database, you need to copy data out to file from all the tables in a database. Phil Factor shows how to do it, and illustrates its use by copying an entire database from one server to another.
2012-12-07
2,690 reads
Red Gate won 8 awards in the recent SQL Server Pro annual product reviews. As a celebration, we're giving away a few prizes.
2012-12-06
2,714 reads
SQL Server 2012 Integration Services offers a wide range of powerful features that allow you to streamline and automate tasks involving data extraction, transformation, and loading. However, incorporating these features into your existing business intelligence framework frequently necessitates additional security measures ensuring that data which is being processed remains protected from unauthorized access.
2012-12-06
2,106 reads
I have a requirement to add the Log Shipping Monitor for an existing installation. I have heard you can only complete this by rebuilding the Log Shipping infrastructure. Is that true? Are there any other options? In this tip I will explain how we can add the Log Shipping monitor to a SQL Server 2005, 2008, 2008 R2 or 2012 environment without rebuilding the Log Shipping installation.
2012-12-05
2,688 reads
Instructions on how to set up the connection string and SSIS package to allow a 64 bit server to export to a 32 bit version of Excel
2012-12-04
7,623 reads
Get a free ebook from Red Gate Software and SQLServerCentral from MVP Grant Fritchey. Learn how to read and interpret execution plans.
2012-12-04
7,296 reads
With Report Builder and SSMS, there isn't much you can't do in the way of the common reports and visualisations. One of the more interesting visualisations uses maps, and that, combined with layers, makes for an impressive way of representing data.
2012-12-04
3,269 reads
How to reset an identity field to the next contiguous value, after deletions.
2012-12-03
8,698 reads
I have to support a third party application that periodically creates a new database on the fly. This obviously causes issues with our backup mechanisms. The databases have a particular pattern for naming, so I can identify the set of databases, however, I need to make sure I'm always backing up the newest one. Read this tip to ensure you are backing up your latest database in a series.
2012-12-03
2,037 reads
PlanTrace: Stop Reading Redshift EXPLAIN Plans. Start Seeing Them Introducing PlanTrace — a free, browser-based...
By Steve Jones
I went to sleep while reading a Kindle book on my phone. I know...
A conversation with Jan Laš, CIO at HOPI, about what deploying a data agent...
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I have this data in a table called dbo.NFLTeams
TeamID TeamName City YearEstablished ------ -------- ---- --------------- 1 Cowboys Dallas 1960 2 Eagles Philadelphia 1933 3 Packers Green Bay 1919 4 Chiefs Kansas City 1960 5 49ers San Francisco 1946 6 Broncos Denver 1960 7 Seahawks Seattle 1976 8 Patriots New England 1960If I run this code, how many rows are returned?
SELECT TOP 2
json_objectagg('Team' : TeamName)
FROM dbo.NFLTeams;
See possible answers