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How do ACID and database transactions work?
...were executing sequentially, and if one needs to read data that is written by another, it will have to wait until the other is finished.
Durability means that once a transaction is complete, it is guaranteed that all of the changes have been recorded to a durable medium (such as a hard disk), and t...
MySql Table Insert if not exist otherwise update
... It might be needed to create UNIQUE constraint for Timestamp by using ALTER TABLE AggregatedData ADD UNIQUE (Timestamp)
– Avyakt
Jan 19 '15 at 19:13
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Creating a BLOB from a Base64 string in JavaScript
...decode a Base64-encoded string into a new string with a character for each byte of the binary data.
const byteCharacters = atob(b64Data);
Each character's code point (charCode) will be the value of the byte. We can create an array of byte values by applying this using the .charCodeAt method for e...
vertical-align with Bootstrap 3
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@pasemes This is caused by the (well known) inline-block extra space. I give a solution in my edit.
– zessx
May 10 '14 at 18:00
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GraphViz - How to connect subgraphs?
...ge labels appear to be floating over a cluster instead of being positioned by the edge itself.
– Winston Smith
Jan 8 '10 at 11:12
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Get Character value from KeyCode in JavaScript… then trim
...character was entered. For example, a lowercase "a" will be reported as 65 by keydown and keyup, but as 97 by keypress. An uppercase "A" is reported as 65 by all events. Because of this distinction, when catching special keystrokes such as arrow keys, .keydown() or .keyup() is a better choice."
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Get program execution time in the shell
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@natli: While time can time an entire pipeline as-is (by virtue of being a Bash keyword), you need to use a group command ({ ...; ...; }) to time multiple commands: time -p { i=x; while read line; do x=x; done < /path/to/file.txt; }
– mklement0
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Git - What is the difference between push.default “matching” and “simple”
..., it's better, in my opinion, to use this option and push your code branch by branch. It's better to push branches manually and individually.
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Webrick as production server vs. Thin or Unicorn?
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A couple important reasons
it's written in Ruby (see http://github.com/ruby/ruby/tree/trunk/lib/webrick)
Edited it doesn't have many features that a production website usually needs, like multiple workers (in particular, pre-forking, life cycle management, asynchronous ...
How do I terminate a thread in C++11?
...execution environment into set of completely isolated processes controlled by the operating system. Process incorporates and isolates execution environment state including local memory of the process and data inside it and all system resources like files, sockets, synchronization objects. Isolation ...