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When and why are database joins expensive?
...ucing the cost of joins involving string comparisons. Not only will vastly more fit in cache, there's a lot less disk reading to do.
Moreover, a good optimiser will choose the most restrictive condition and apply it before it performs a join, very effectively leveraging the high selectivity of joi...
When to use thread pool in C#? [closed]
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What are the benefits of using C# vs F# or F# vs C#? [closed]
I work for a tech company that does more prototyping than product shipment. I just got asked what's the difference between C# and F#, why did MS create F# and what scenarios would it be better than C#.
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How can I apply a function to every row/column of a matrix in MATLAB?
...ctor of sums for each column
And here is how you would do this using the more complicated num2cell/cellfun option:
M = magic(10); %# A 10-by-10 matrix
C = num2cell(M, 1); %# Collect the columns into cells
columnSums = cellfun(@sum, C); %# A 1-by-10 vector of sums for...
Thread vs ThreadPool
...ing in, then the thread pool will tune itself to your workload by creating more threads in the pool by the above process so that there are a larger number of thread available to process requests
check Here for more in depth info on how the thread pool functions under the hood
Creating a new threa...
How to check if a string starts with a specified string? [duplicate]
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What is the difference between the HashMap and Map objects in Java?
...ap<String, Object> things;
private HashMap<String, Object> moreThings;
protected HashMap<String, Object> getThings() {
return this.things;
}
protected HashMap<String, Object> getMoreThings() {
return this.moreThings;
}
public Foo() {...
PHP parse/syntax errors; and how to solve them
...e culprit.
Read the line left to right and imagine what each symbol does.
More regularly you need to look at preceding lines as well.
In particular, missing ; semicolons are missing at the previous line ends/statement. (At least from the stylistic viewpoint. )
If { code blocks } are incorrectly c...
Build query string for System.Net.HttpClient get
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http://example.com/?foo=bar%3c%3e%26-baz&bar=bazinga
that you could more than safely feed to your HttpClient.GetAsync method.
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Hidden Features of PHP? [closed]
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Documentation. The documentation gets my vote. I haven't encountered a more thorough online documentation for a programming language - everything else I have to piece together from various websites and man pages.
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