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Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?
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@Jasen That's totally clear. Just wanted to emphasize that the answer "But if you have non-unique entries on your table. Here is the how to add unique constraint on your table." will not work. Non-unique entries must of course always be conso...
What exactly are “spin-locks”?
...ads on the same core. This has a performance penalty if the wait time is really short, because your thread now has to wait for a preemption to receive CPU time again.
Besides, kernel objects are not available in every state of the kernel, such as in an interrupt handler or when paging is not availab...
Django URL Redirect
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You can try the Class Based View called RedirectView
from django.views.generic.base import RedirectView
urlpatterns = patterns('',
url(r'^$', 'macmonster.views.home'),
#url(r'^macmon_home$', 'macmonster.views.home'),
url(r'^macmon_output/$', 'ma...
Minimum and maximum date
I was wondering which is the minimum and the maximum date allowed for a Javascript Date object. I found that the minimum date is something like 200000 B.C., but I couldn't get any reference about it.
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git - Server host key not cached
...be able to do your git push origin.
As an alternative, you could also manually add the key of origin to .ssh/known_hosts but this requires that you adhere to the format of the known_hosts file as described in the man page of sshd (Section AUTHORIZED_KEYS FILE FORMAT).
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When is the finalize() method called in Java?
I need to know when the finalize() method is called in the JVM . I created a test class which writes into a file when the finalize() method is called by overriding it. It is not executed. Can anybody tell me the reason why it is not executing?
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OpenShift rhc setup using multiple accounts
...using "server add" command and then you can provide the server nickname in all subsequent commands using --server option.
For example,
rhc server add -l <first_account> --nickname srv1 <first-server>
rhc server add -l <second_account> --nickname srv2 <second-server>
You m...
What's the difference between integer class and numeric class in R
...for double precision floating point numbers) and integer. R will automatically convert between the numeric classes when needed, so for the most part it does not matter to the casual user whether the number 3 is currently stored as an integer or as a double. Most math is done using double precision...
Converting pfx to pem using openssl
... enter the passphrase you just made up to store decrypted.
The 4th puts it all together into 1 file.
Then you can configure HAProxy to use the file.combo.pem file.
The reason why you need 2 separate steps where you indicate a file with the key and another without the key, is because if you have a...
Splitting a string into chunks of a certain size
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yield return str.Substring(i, chunkSize);
}
This will work for all strings that can be split into a whole number of chunks, and will throw an exception otherwise.
If you want to support strings of any length you could use the following code:
static IEnumerable<string> ChunksUpto(...