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When should I use a composite index?
...olumn_A )
But it will not (at least not directly, maybe it can help partially if there are no better indices) help for queries that need
index( column_A, column_C )
Notice how column_B is missing.
In your original example, a composite index for two dimensions will mostly benefit queries that q...
What is the @Html.DisplayFor syntax for?
...or certain model attributes. Helpful question and answer guys, thanks. +1s all round.
– Robin Winslow
Aug 8 '12 at 13:25
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ASP.NET MVC - Set custom IIdentity or IPrincipal
...ver is easier / more suitable. I want to extend the default so that I can call something like User.Identity.Id and User.Identity.Role . Nothing fancy, just some extra properties.
...
What data is stored in Ephemeral Storage of Amazon EC2 instance?
...olumes attached when you launch an Amazon EBS-backed instance are automatically deleted when the instance terminates" but you can modify that via configuration.
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Setting up FTP on Amazon Cloud Server [closed]
...ce created and have associated an Elastic IP Address to it.
Step #1: Install vsftpd
SSH to your EC2 server. Type:
> sudo yum install vsftpd
This should install vsftpd.
Step #2: Open up the FTP ports on your EC2 instance
Next, you'll need to open up the FTP ports on your EC2 server. Log...
Properly escape a double quote in CSV
...le double quote to escape a double quote. You can use a command-line tool called csvfix to detect any lines which don't conform: csvfix check -nl -v [filename]
– Sam Critchley
Jun 30 '16 at 14:51
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What is Python used for? [closed]
...s not specialised to a specific target of users (like R for statistics, or PHP for web programming). It is extended through modules and libraries, that hook very easily into the C programming language.
Python enforces correct indentation of the code by making the indentation part of the syntax. Ther...
What data type to use for hashed password field and what length?
...l be unique per user. However, any known salt makes the hash cryptographically weaker than if there were no known salt. A salt only adds value if it is also unknown.
– fijiaaron
May 18 '12 at 13:39
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What is Java Servlet?
...a particular type of network request - most commonly an HTTP request. Basically servlets are usually used to implement web applications - but there are also various frameworks which operate on top of servlets (e.g. Struts) to give a higher-level abstraction than the "here's an HTTP request, write to...
How to create an HTTPS server in Node.js?
...information came in very handy as I run a node.js tool (PDFJS) on top of a PHP app that was recently forced to run over https. The iframe was very unhappy to load my node.js app on an alternate, non-https port.
– lewsid
Oct 7 '14 at 16:12
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