SQL Server, Analytics, .Net, Machine Learning, R, Python
Mitch Wheat has been working as a professional programmer since 1984, graduating with a honours degree in Mathematics from Warwick University, UK in 1986. He moved to Perth in 1995, having worked in software houses in London and Rotterdam. He has worked in the areas of mining, electronics, research, defence, financial, GIS, telecommunications, engineering, and information management. Mitch has worked mainly with Microsoft technologies (since Windows version 3.0) but has also used UNIX. He holds the following Microsoft certifications: MCPD (Web and Windows) using C# and SQL Server MCITP (Admin and Developer). His preferred development environment is C#, .Net Framework and SQL Server. Mitch has worked as an independent consultant for the last 10 years, and is currently involved with helping teams improve their Software Development Life Cycle. His areas of special interest lie in performance tuning
Tuesday, February 26, 2013
SQL Diagnostic Runner Updated
Thanks to Todd who reported a bug when connecting with username and password (I messed up the connection string).
I’ve uploaded an updated version (v188.8.131.5257) which you can download from the links below (or from any of the previous posts):
[Servername will now take a semi-colon separated list of servers to run against, but with the limitation of using the same credentials and diagnostic script.]
Sunday, February 24, 2013
Parsing Command Line Arguments
If you want a full blown Command Line Parser then there are several good options available:
[I used the Command Line Parser Library recently in the SQL Diagnostic Runner I wrote.]
If you just want a very basic parser, supporting simple options in the format /argname:argvalue then you could use this:
Monday, February 18, 2013
Largest .NET Object….
In .NET versions prior to .NET 4.5, the largest allocation for any single object is 2GB.
On 64-bit platforms, in .NET versions 4.5 and greater, it is possible to enable the allocation of arrays that are larger than 2 GB in total size (but NOTE this does not change other limits on object size or array size):
The default setting is not enabled.
You can enable this feature by using the gcAllowVeryLargeObjects element in your application configuration file:
Sunday, February 17, 2013
Guide to Recognizing Popular Timestamp Formats
Bookmarking for future reference: Guide to recognizing popular timestamp formats
Thursday, February 07, 2013
SQL Diagnostic Runner Updated
David Vogelaar (and others) kindly reported a bug: I wasn’t converting invalid filename characters when using an SQL Server instance name for the auto-generated results filename. This has been fixed. You can download version 1.0.2 from the previous download links or the ones below.
There is a known issue:
The results file is generated OK but sometimes when you open it in Excel a seemingly ‘nasty’ message is shown:
The file will open OK if you chose to recover: simply accept the prompts and save over the original. I will fix as soon as I can.
Tuesday, February 05, 2013
SQL Server: Differences between Temp Tables and Table Variables
I had been thinking of collating the differences between temp tables and table variables and posting it, but Martin Smith has already written a great summary over at DBA StackExchange:
It’s broken up into the following categories:
SQL Diagnostic Runner: Version 1.0
Glenn Berry mentioned the runner for his diagnostic scripts I wrote a few weeks ago. He also mentioned it would be nice to have a UI version. I had already written a basic UI when I initially released the command line version. So here it is, warts and all! (along with a minor update to the command line version)
Comments and feedback welcome.
Monday, February 04, 2013
List of Freely Available Programming Books
One of the things I think StackOverflow has got wrong is hiding, closed, highly useful questions that are deemed in some way not to ‘fit’ the site’s philosophy (whatever that might be). If your rep is higher than 10K, you can view these hidden closed questions. The site has bigger problems such as the increasing amount of very, very poor quality questions that amount to nothing more than “I can’t be bothered doing/looking up X. Please do X for me”.
Here’s an example: List of freely available programming-books
Can’t see it? I’d obviously prefer to link to the entire question and answers, but assuming you can’t see it, here’s an excerpt from the answer begun by George Stocker (who ironically is one of the people who closed it), and then contributed to by many people as a community wiki:
MSN, Email: mitch døt wheat at gmail.com