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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
Ke...
How To Save Canvas As An Image With canvas.toDataURL()?
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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 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...
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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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 See history for earlier (outdated) answers.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...
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, ...