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postgres: upgrade a user to be a superuser?

In postgres, how do I change an existing user to be a superuser? I don't want to delete the existing user, for various reasons. ...
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What's the difference between libev and libevent?

Both 2 libs are designed for async i/o scheduling, and both engages epoll on linux, and kqueue on FreeBSD, etc. 2 Answers ...
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Pull request vs Merge request

What is the difference between a Pull request and a Merge request? 6 Answers 6 ...
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What is a tracking branch?

Can someone explain a "tracking branch" as it applies to git? 4 Answers 4 ...
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Do declared properties require a corresponding instance variable?

Do properties in Objective-C 2.0 require a corresponding instance variable to be declared? For example, I'm used to doing something like this: ...
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PHP Foreach Pass by Reference: Last Element Duplicating? (Bug?)

I just had some very strange behavior with a simple php script I was writing. I reduced it to the minimum necessary to recreate the bug: ...
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Groovy: what's the purpose of “def” in “def x = 0”?

In the following piece of code (taken from the Groovy Semantics Manual page ), why prefix the assignment with the keyword def ? ...
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What is the Invariant Culture?

Could anybody give an example to demonstrate the usage of the Invariant Culture ? I don't understand what the documentation describes. ...
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Control the size of points in an R scatterplot?

In R, the plot() function takes a pch argument that controls the appearance of the points in the plot. I'm making scatterplots with tens of thousands of points and prefer a small, but not too small dot. Basically, I find pch='.' to be too small, but pch=19 to be too fat. Is there somethin...
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gunicorn autoreload on source change

Finally I migrated my development env from runserver to gunicorn/nginx. 4 Answers 4 ...