Data Compression Double Take
A lot has been written about the potential performance benefits of SQL Server data compression; but hard performance data? Not so much.
2012-03-05
267,356 reads
Tony Davis
- Interests: football, modern literature, real ale
Data Compression Double Take
A lot has been written about the potential performance benefits of SQL Server data compression; but hard performance data? Not so much.
2012-03-01
349 reads
Testing times
Databases are unique in IT that they are singularly resistant to 'best practice' advice. Any such advice can never be anything other than a starting position for tests in your own environment.
2012-01-23
79 reads
Virtualization and the existential angst of the DBA
Tony Davis reflects on the existential angst felt by the DBA separated from his or her hardware.
2011-12-19
114 reads
Gold in the Execution Plan hills
There's more information hidden behind those graphical plans than you might first suspect.
2011-10-31
232 reads
Where are all the MVBs?
Whereas there are plenty of experts prepared to help with the technology, few seem to come forward when the struggle is against the bureaucracy rather than a recalcitrant server. Where are all the SQL MVBs (Masters at Vanquishing Bureaucracy) when you need them!?
2011-09-26
142 reads
Being an extremely productive DBA
In order to gain better support for learning and training opportunities, the DBA needs to prove a direct link to productivity and results, in words and numbers the CEO will understand.
2011-07-18
269 reads
Cloud Barriers
I'd like to hear the thoughts of DBAs out there on Windows and SQL Azure, and the prospects of moving applications and databases into the clouds. How many DBAs work for companies that have done it or are seriously considering it? What are the deepest concerns?
2011-07-04
97 reads
DBAs on ACID
Any DBA who has been bitten by these subtle data integrity issues, or reports that erratically produce the wrong results, will know how much careful testing is involved in mitigating them.
2011-04-04
277 reads
Let the optimizer drive
For many, there is something disconcerting in the idea of the Query Optimizer; they crave control, but it really is best to take a back seat and let the Optimizer do its job.
2011-02-07
208 reads
Blogs
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Forums
SQL Art, Part 4: Happy 4th of July — A British DBA's Guide to Celebrating a War We Don't Talk About
Comments posted to this topic are about the item SQL Art, Part 4: Happy...
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Question of the Day
Getting the Average
I have this data in the dbo.Commission table in a SQL Server 2022 database.
salesperson commission Brian 12 Brian 16 Andy 7 Andy 14 Andy 21 Steve 20 Steve NULLAll the data is a varchar, and I decide to run this query to get the totals for each salesperson.
SELECT SalesPerson
, AVG(TRY_PARSE(Commission AS int)) AS TotalCommission
FROM commission
GROUP BY SalesPerson
GO
What average commission is calculated for Steve? See possible answers