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Get a random item from a JavaScript array [duplicate]
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edited Mar 26 at 14:06
answered May 6 '11 at 17:50
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How to write a scalable Tcp/Ip based server
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+200
I've written something similar to this in the past. From my research years ago showed that writing your own socket implementation was...
Transaction isolation levels relation with locks on table
.... This means B reads the data under some condition i.e. WHERE aField > 10 AND aField < 20, A inserts data where aField value is between 10 and 20, then B reads the data again and get a different result.
SERIALIZABLE - lock on a full table(on which Select query is fired). This means, B reads th...
How To Save Canvas As An Image With canvas.toDataURL()?
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What is the purpose of setting a key in data.table?
...e other vignettes that we plan to.
I've updated this answer again (Feb 2016) in light of the new on= feature that allows ad-hoc joins as well. See history for earlier (outdated) answers.
What exactly does setkey(DT, a, b) do?
It does two things:
reorders the rows of the data.table DT by the...
Can Visual Studio 2012 be installed side-by-side w/ Visual Studio 2010?
Will Visual Studio 2012 interfere/break .NET 4 and/or Visual Studio 2010 if installed side-by-side on the same instance of Windows?
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Allowed characters in Linux environment variable names
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206
From The Open Group:
These strings have the form
name=value; names shall not contain
th...
How to set up a cron job to run an executable every hour?
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0 * * * * cd folder_containing_exe && ./exe_name
should work unless there is something else that needs to be setup for the program to run.
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JavaScript equivalent of jQuery's extend method
... if(arguments[i].hasOwnProperty(key))
arguments[0][key] = arguments[i][key];
return arguments[0];
}
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PostgreSQL database default location on Linux
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[root@server1 ~]# ps auxw | grep postgres | grep -- -D
postgres 1535 0.0 0.1 39768 1584 ? S May17 0:23 /usr/local/pgsql/bin/postgres -D /usr/local/pgsql/data
Note that it is possible, though not very frequent, to run two instances of the same PostgreSQL server (same binaries, ...