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What are the main performance differences between varchar and nvarchar SQL Server data types?

... 100% clear. But there is even more to consider: size of transaction log files time it takes to replicate (if using replication) time it takes to ETL (if ETLing) time it takes to ship logs to a remote system and restore (if using Log Shipping) size of backups length of time it takes to complete th...
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Generate a heatmap in MatPlotLib using a scatter data set

...mean to be an idiot, but how do you actually have this output to a PNG/PDF file instead of only displaying in an interactive IPython session? I'm trying to get this as some sort of normal axes instance, where I can add a title, axis labels, etc. and then do the normal savefig() like I would do for a...
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Which is faster: Stack allocation or Heap allocation

...ybe assign it to a variable that is declared extern and defined in another file). But even in this case, the compiler may notice that -- on the stack at least -- e will always be allocated at the same memory address, and then do constant folding like in (1) above. I get all iterations of the loop,...
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Where to use EJB 3.1 and CDI?

...o an EJB, you don't have to list it and map it as a servlet in the web.xml file. That's work to me. Plus I get the option to use any of the other functionality mentioned below. So it's a no-brainer for me. Available to @Stateless and @Singleton only. Using JAX-RS Exposing a JAX-RS resource via...
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Common programming mistakes for Clojure developers to avoid [closed]

...notice, because your code works at the REPL and doesn't work from a source file or inside a function. user=> (map println [:foo :bar]) (:foo :bar nil nil) share | improve this answer |...
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Is it a good practice to use try-except-else in Python?

... ConnectionRefusedError ConnectionResetError FileExistsError FileNotFoundError InterruptedError IsADirectoryError NotADirectoryError PermissionError ProcessLookupError TimeoutError ...
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How to set a Default Route (To an Area) in MVC

... locations[i], name, controllerName, areaName); if (FileExists(controllerContext, testPath)) { searchedLocations = EmptyLocations; virtualPath = testPath; ViewLocationCache.InsertViewLocation( cont...
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What is a ViewModelLocator and what are its pros/cons compared to DataTemplates?

...MainViewModel>(); } } // returns true if editing .xaml file in VS for example private bool IsInDesignMode() { return DesignerProperties.GetIsInDesignMode(dummy); } } And to use it I can add my locator to App.xaml resources: xmlns:core="clr-namespace:MyViewM...
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Swift and mutating struct

...has to be forbidden for constant instances. – Analog File Jun 26 '14 at 16:01 3 @golddove Yes, an...
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Use of var keyword in C#

...n using ShortType = LongGenericType<A,B,C> directive at the top of a file, since that gives the same readability, doesn't require that you recreate the constructors, and doesn't eliminate child classes from being candidates. – Adam Robinson May 19 '10 at ...