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How does lock work exactly?
...e to sleep. If you have some heavy calculations or long lasting code (e.g. file upload) in a lock it results in a huge performance loss.
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MongoDB with redis
...s associated operations (union, intersection, difference on multiple sets, etc ...). It is quite easy to implement a basic faceted search or tagging engine on top of this feature, which is an interesting addition to MongoDB more traditional indexing capabilities.
Redis supports efficient blocking po...
Should MySQL have its timezone set to UTC?
...n tables
in the mysql database have been created and populated.
in the file "my.cnf"
default_time_zone='+00:00'
or
timezone='UTC'
@@global.time_zone variable
To see what value they are set to
SELECT @@global.time_zone;
To set a value for it use either one:
SET GLOBAL time_zone = '+8:0...
Debug.Assert vs Exception Throwing
... in production code by using Trace.Assert. You can even use the app.config file to re-direct production assertions to a text file rather than being rude to the end-user.
– HTTP 410
Nov 23 '11 at 14:55
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Generating random numbers in Objective-C
...min + arc4random_uniform(max - min + 1));
}
If I end up using it in many files I usually declare a macro as
#define RAND_FROM_TO(min, max) (min + arc4random_uniform(max - min + 1))
E.g.
NSInteger myInteger = RAND_FROM_TO(0, 74) // 0, 1, 2,..., 73, 74
Note: Only for iOS 4.3/OS X v10.7 (Lion...
What is a “web service” in plain English?
I've been reading about "web services" here on SO, on Wikipedia, Google, etc., and I don't quite understand what they are. What is the plain English definition/description?
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Simple logical operators in Bash
...t on operators such as -n $variable to test if a variable is empty and -e $file to test if a file exists. There are also string equality operators: "$string1" == "$string2" (beware that the right-hand side is a pattern, e.g. [[ $foo == a* ]] tests if $foo starts with a while [[ $foo == "a*" ]] tests...
JavaScript OOP in NodeJS: how?
... want less "hacky", you should use inheritance library or such.
Well in a file animal.js you would write:
var method = Animal.prototype;
function Animal(age) {
this._age = age;
}
method.getAge = function() {
return this._age;
};
module.exports = Animal;
To use it in other file:
var A...
Why does pylint object to single character variable names?
...r even though less than three characters. Find in or add to your pylintrc file, under the [FORMAT] header:
# Good variable names which should always be accepted, separated by a comma
good-names=i,j,k,ex,Run,_,pk,x,y
Here pk (for primary key), x, and y are variable names i've added.
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What is the difference between Linq to XML Descendants and Elements
...wer. Which one of these have the best performance with small to medium XML files. Thanks
2 Answers
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