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When should I use a composite index?
... it compares 5 ways of doing lat/lng searches: http://mysql.rjweb.org/doc.php/latlng#representation_choices (It references the link given above as one of the 5.) One of the other ways is this, and it points out that they are optimal for the particular case:
INDEX(geolat, geolng),
INDEX(geolng, g...
HTML5 Canvas vs. SVG vs. div
...stic.
Here are some interesting benchmarks:
http://svbreakaway.info/tp.php#jan21a
http://www.eleqtriq.com/2010/02/canvas-svg-flash/
http://smus.com/canvas-vs-svg-performance/
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UTF-8: General? Bin? Unicode?
...se read the following post from MySQL forums:
http://forums.mysql.com/read.php?103,187048,188748
As for utf8_bin:
Both utf8_general_ci and utf8_unicode_ci perform case-insensitive comparison. In constrast, utf8_bin is case-sensitive (among other differences), because it compares the binary values o...
How does the Windows Command Interpreter (CMD.EXE) parse scripts?
... Labels vs. Unexecuted Labels, see https://www.dostips.com/forum/viewtopic.php?f=3&t=3803&p=55405#p55405
Phase 3) Echo the parsed command(s) Only if the command block did not begin with @, and ECHO was ON at the start of the preceding step.
Phase 4) FOR %X variable expansion: Only if a F...
When do I need to use a semicolon vs a slash in Oracle SQL?
...age or one specific version of your runtime environment (Java 7, .Net 4.0, PHP 5.x, ...)
– a_horse_with_no_name
Nov 21 '13 at 14:49
2
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What is Java Servlet?
...b server inside the web server itself. If you want something looking like PHP or ASP you need JSPs (which are a special kind of servlets)
– Thorbjørn Ravn Andersen
Aug 27 '11 at 10:20
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How to call an external command?
...at you want in a CGI script. The problem is not specific to Python; in the PHP community the problems are the same.
The solution is to pass DETACHED_PROCESS Process Creation Flag to the underlying CreateProcess function in Windows API.
If you happen to have installed pywin32, you can import the fla...
SHA512 vs. Blowfish and Bcrypt [closed]
... of and given its inclusion in various crypt implementations (including in PHP which I use), when I read the original question I even assumed that's what the OP meant when he asked about SHA-512 - that he was actually referring to thousands of rounds of SHA-512 vs bcrypt which uses hundreds or thous...
How to use sessions in an ASP.NET MVC 4 application?
I am new to ASP.NET MVC. I have used PHP before and it was easy to create a session and select user records based on the current session variables.
...
C state-machine design [closed]
... can still see some of the content on state-machine.com/resources/articles.php, but even there most of the state machine-related links are dead. This is one of the only good links there: state-machine.com/resources/…
– Tatiana Racheva
Jan 25 '14 at 19:12
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