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Why are Oracle table/column/index names limited to 30 characters?

...understand that many years ago there would be this kind of limitation, but nowadays surely this limit could easily be increased. We have naming conventions for objects, but there is always a case that turns up where we hit this limit - especially in naming foreign keys. ...
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Why were pandas merges in python faster than data.table merges in R in 2012?

... It looks like Wes may have discovered a known issue in data.table when the number of unique strings (levels) is large: 10,000. Does Rprof() reveal most of the time spent in the call sortedmatch(levels(i[[lc]]), levels(x[[rc]])? This isn't really the join itself (t...
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What is this Javascript “require”?

...b browser with a limited global context defined mostly by what came to be known as the Document Object Model (DOM) level 0 (the Netscape Navigator Javascript API). Server-side Javascript eliminates that restriction and allows Javascript to call into various pieces of native code (like the Postgres ...
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What are detached, persistent and transient objects in hibernate?

...ng it with a Session: Long id = (Long) session.save(person); // person is now in a persistent state Now, if we close the Hibernate Session, the persistent instance will become a detached instance: it isn't attached to a Session anymore (but can still be modified and reattached to a new Session la...
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Reading output of a command into an array in Bash

...t really understand why this was even implemented in the first place!). Now I'm going to tell you why the following method: my_array=( $( my_command) ) is broken when there are spaces: $ # I'm using this command to test: $ echo "one two"; echo "three four" one two three four $ # Now I'm going...
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How ListView's recycling mechanism works

...s advice I was able to change how I added Views to my GridView. Problem is now I have something that does not make sense. This is my getView from my BaseAdapter : ...
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How to properly match varargs in Mockito

... for info anyVararg is now deprecated: "@deprecated as of 2.1.0 use any()" – alexbt Nov 13 '16 at 20:12 ...
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Best approach to real time http streaming to HTML5 video client

... EDIT 3: As of IOS 10, HLS will support fragmented mp4 files. The answer now, is to create fragmented mp4 assets, with a DASH and HLS manifest. > Pretend flash, iOS9 and below and IE 10 and below don't exist. Everything below this line is out of date. Keeping it here for posterity. EDIT...
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Visual Studio Copy Project

... This is incredibly useful, how did I not know about this before? Thanks! – Aldarrion Jan 8 '18 at 17:23 5 ...
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jquery live hover

... jQuery 1.4.1 now supports "hover" for live() events, but only with one event handler function: $("table tr").live("hover", function () { }); Alternatively, you can provide two functions, one for mouseenter and one for mouseleave: $(...