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What is a columnar database?

...an easy fashion). How do they differ from relational databases? They generally differ from traditional (row-oriented) databases with regards to ... performance... storage requirements ... ease of modification of the schema ... ...in specific use cases of DBMSes. In particular they offer advanta...
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Disable Required validation attribute under certain circumstances

...sily solved by using view models. View models are classes that are specifically tailored to the needs of a given view. So for example in your case you could have the following view models: public UpdateViewView { [Required] public string Id { get; set; } ... some other properties } pu...
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Find CRLF in Notepad++

How can I find/replace all CR/LF characters in Notepad++? 18 Answers 18 ...
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What is the difference between compile and link function in angularjs

...ulation of tElement = template element), hence manipulations that apply to all DOM clones of the template associated with the directive. link function - use for registering DOM listeners (i.e., $watch expressions on the instance scope) as well as instance DOM manipulation (i.e., manipulation of iEle...
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Difference between Inheritance and Composition

... is now considered a blunder. A stack "is-NOT-a" vector; you should not be allowed to insert and remove elements arbitrarily. It should've been composition instead. Unfortunately it's too late to rectify this design mistake, since changing the inheritance hierarchy now would break compatibility wit...
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Indexes of all occurrences of character in a string

...r Thank you very much for you answer, it seem to be right, but this is actually my first day with Java so I'm a little confused by the final result, this seems to output -1 at the end an I don't quite understand why! thanks!! – Trufa Feb 17 '11 at 20:55 ...
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iPhone Simulator suddenly started running very slow

...lator for a number of weeks and it has been running well up until now, but all of a sudden has begun running very slow both when loading content and animations. I have not made any changes to my code since I last tested it successfully. ...
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Tools to search for strings inside files without indexing [closed]

...it would be a great idea to plaster the entire app with connection strings all over the place. 6 Answers ...
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Testing modules in rspec

... Nice. This helped me avoid all sorts of issues with class ivars spanning tests. Gave the classes names by assigning to constants. – captainpete Jun 25 '12 at 12:48 ...
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How to create a directory using Ansible

... If state=directory, all immediate subdirectories will be created if they do not exist, since 1.7 they will be created with the supplied permissions. – Alex Oct 6 '16 at 10:05 ...