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Why does PostgreSQL perform sequential scan on indexed column?
Very simple example - one table, one index, one query:
4 Answers
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Google Maps API 3 - Custom marker color for default (dot) marker
...tom colours for markers, but I can't get it to use the default marker (the one you get when you do a google maps search - with a dot in the middle), it just seems to provide markers with a letter in, or with a special icon.
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How to find the created date of a repository project on GitHub?
...he repository was created.
Considering the LibGit2Sharp repository above, one can see that it's been created on Feb, 2nd 2011 at 16:44:49 UTC.
Note: The created_at won't necessarily reflect the date of the first commit. It's the date the repository has been created on GitHub. For instance, the xun...
Lock-free multi-threading is for real threading experts
... through an answer that Jon Skeet gave to a question and in it he mentioned this:
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conditional unique constraint
...re i need to enforce a unique constraint on a set of columns, but only for one value of a column.
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Most lightweight way to create a random string and a random hexadecimal number
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I got a faster one for the hex output. Using the same t1 and t2 as above:
>>> t1 = timeit.Timer("''.join(random.choice('0123456789abcdef') for n in xrange(30))", "import random")
>>> t2 = timeit.Timer("binascii.b2a_hex(o...
What's the difference between ConcurrentHashMap and Collections.synchronizedMap(Map)?
...ng at the source code, the synchronized map is only an implementation with one mutex (blocking) while the ConcurrentHashMap is more complex to deal with concurrent access
– Vinze
Feb 4 '09 at 9:36
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Placement of the asterisk in pointer declarations
...'ve recently decided that I just have to finally learn C/C++, and there is one thing I do not really understand about pointers or more precisely, their definition.
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How to use git bisect?
... was working at the revision 0. So the regression was likely introduced in one of the commits 1, 2, 3, 4, 5, current.
You could try to check out each commit, build it, check if the regression is present or not. If there is a large number of commits, this can take a long time. This is a linear searc...
vector vs. list in STL
...that I didn't want the OP to think that the interface is not there in case one wants to shoot himself in the (performance) foot.
– Manuel
Feb 5 '10 at 18:22
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