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Why do x86-64 systems have only a 48 bit virtual address space?
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Because that's all that's needed. 48 bits give you an address space of 256 terabyte. That's a lot. You're not going to see a system which needs more than that any time soon.
So CPU manufacturers took a shortcut. They use an instruction set which allows a full 64...
How to pass parameters correctly?
...eginner but not a programming beginner.
I'm trying to learn C++(c++11) and it's kinda unclear for me the most important thing: passing parameters.
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Is Big O(logn) log base e?
...data structures, I see the Big O notation is typically noted as O(logn). With a lowercase 'l' in log, does this imply log base e (n) as described by the natural logarithm? Sorry for the simple question but I've always had trouble distinguishing between the different implied logarithms.
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How do I recursively delete a directory and its entire contents (files + sub dirs) in PHP?
How do I delete a directory and its entire contents (files and subdirectories) in PHP?
21 Answers
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Volatile Vs Atomic [duplicate]
...ct of the volatile keyword is approximately that each individual read or write operation on that variable is atomic.
Notably, however, an operation that requires more than one read/write -- such as i++, which is equivalent to i = i + 1, which does one read and one write -- is not atomic, since anot...
CSS Background Opacity [duplicate]
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Children inherit opacity. It'd be weird and inconvenient if they didn't.
You can use a translucent PNG file for your background image, or use an RGBa (a for alpha) color for your background color.
Example, 50% faded black background:
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Right way to initialize an OrderedDict using its constructor such that it retains order of initial d
What's the correct way to initialize an ordered dictionary (OD) so that it retains the order of initial data?
2 Answers
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How to delete large data of table in SQL without log?
...cate table will simply empty the table, you cannot use WHERE clause to limit the rows being deleted and no triggers will be fired.
On the other hand if you are deleting more than 80-90 Percent of the data, say if you have total of 11 Million rows and you want to delete 10 million another way would...
Is iterating ConcurrentHashMap values thread safe?
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What does it mean?
That means that each iterator you obtain from a ConcurrentHashMap is designed to be used by a single thread and should not be passed around. This includes the syntactic sugar that the for-each loop provides.
Wh...
What is the benefit of zerofill in MySQL?
I just want to know what is the benefit/usage of defining ZEROFILL for INT DataType in MySQL ?
9 Answers
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