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When to add what indexes in a table in Rails

...ch record, because it has to rebuild each index. Credit: https://tomafro.net/2009/08/using-indexes-in-rails-choosing-additional-indexes, rails - created_at when user for ordering, Should you add an Index to the table?, and the answers above. ...
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Can “using” with more than one resource cause a resource leak?

... } } It produces the following CIL (in Visual Studio 2013, targeting .NET 4.5.1): .method public hidebysig specialname rtspecialname instance void .ctor() cil managed { // Code size 82 (0x52) .maxstack 2 .locals init ([0] class [System.Drawing]System.Drawing.Font fo...
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What are the differences between Clojure, Scheme/Racket and Common Lisp?

... Clojure has hygienic macros. More info here: xivilization.net/~marek/blog/2013/09/17/… – Christopher Kuttruff Apr 8 '18 at 8:06  |  ...
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Wrap a delegate in an IEqualityComparer

...ition of why one should never ignore hash codes when defining equality in .Net. – Marcelo Cantos Jun 29 '13 at 14:24  |  show 3 more comments ...
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How to change past commit to include a missed file?

... up something - commit saved as patch in physical file is your best safety net. – mvp Jan 16 '13 at 22:49 The real con...
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What are the pros and cons to keeping SQL in Stored Procs versus Code [closed]

...this with a friend on an open source project that we're working on (C# ASP.NET Forum). At the moment, most of the database access is done by building the SQL inline in C# and calling to the SQL Server DB. So I'm trying to establish which, for this particular project, would be best. ...
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How does BLAS get such extreme performance?

... @ulaff.net: That maybe. This was written 6 years ago. I think the fastest BLAS implementation currently (on Intel of course) is Intel MKL, but it isn't open source. – Andrew Tomazos Feb 11 '1...
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Directive isolate scope with ng-repeat scope in AngularJS

...r questions, instead take a look at the following fiddle: http://jsfiddle.net/dVPLM/ Key point is that instead of trying to fight and change the conventional behaviour of Angular, you could structure your directive to work with ng-repeat as opposed to trying to override it. In your template: ...
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What really happens in a try { return x; } finally { x = null; } statement?

...s nothing to do with exceptions and exception handling. This is about how .NET implements the finally resource guard construct. – g.pickardou Oct 30 '15 at 12:35 ...
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64-bit version of Boost for 64-bit windows

...type=complete As a longer answer, here are my build notes for having VS .NET 2008 32-bit and 64-bit boost libraries in the same hierarchy (which is I suspect a common use case): Build the win32 binaries bjam --toolset=msvc-9.0 --build-type=complete stage Create the directory lib\win32 Move the...