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What is the MySQL VARCHAR max size?
...ecause their contents are stored separately from the rest of the row. Read more about Limits on Table Column Count and Row Size.
Maximum size a single column can occupy, is different before and after MySQL 5.0.3
Values in VARCHAR columns are variable-length strings. The length can be specified...
How and/or why is merging in Git better than in SVN?
...nes' and their aunts experimentation. This is serious cognitive noise. The more branches you add, the more crap you'll get to see.
The more public branches you have in a repository the harder it will be to keep track of all the different branches. So the question you'll have is if the branch is sti...
What is thread contention?
...d resources in such a way that at least one of the contending threads runs more slowly than it would if the other thread(s) were not running.
The most obvious example of contention is on a lock. If thread A has a lock and thread B wants to acquire that same lock, thread B will have to wait until th...
When to use wrapper class and primitive type
...rtain constructs such as Collections require objects and that objects have more overhead than their primitive counterparts (memory & boxing).
Another consideration is:
It can be handy to initialize Objects to null or send null parameters into a method/constructor to indicate state or function....
The necessity of hiding the salt for a hash
... used for every hash. In practice, this is easy to achieve by getting 8 or more bytes from cryptographic quality random number generator.
From a previous answer of mine:
Salt helps to thwart pre-computed dictionary attacks.
Suppose an attacker has a list of likely passwords. He can hash ea...
More elegant “ps aux | grep -v grep”
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Dot character '.' in MVC Web API 2 for request such as api/people/STAFF.45287
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Regular expression for floating point numbers
...guages. See Is a Regex the Same as a Regular Expression? at RexEgg.com for more information.)
That said, most regex engines (actually, all of them, as far as I know) would accept \.. Most likely, there's an issue with escaping.
The Trouble with Escaping
Some languages have built-in support for re...
Regex Pattern to Match, Excluding when… / Except between
--Edit-- The current answers have some useful ideas but I want something more complete that I can 100% understand and reuse; that's why I set a bounty. Also ideas that work everywhere are better for me than not standard syntax like \K
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Database development mistakes made by application developers [closed]
...e using MyISAM or those that are using InnoDB but aren't using it anyway.
More here:
How important are constraints like NOT NULL and FOREIGN KEY if I’ll always control my database input with php?
Are foreign keys really necessary in a database design?
Are foreign keys really necessary in a data...