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How to list all the available keyspaces in Cassandra?
I am newbie in Cassandra and trying to implement one toy application using Cassandra. I had created one keyspace and few column families in my Cassandra DB but I forgot the name of my cluster.
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Understanding recursion [closed]
...e containing five flowers?
Answer: if the vase is not empty, you take out one flower
and then you empty a vase containing four flowers.
How do you empty a vase containing four flowers?
Answer: if the vase is not empty, you take out one flower
and then you empty a vase containing three flowers.
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How to do parallel programming in Python?
...an do generic work for you. Since we did not pass processes, it will spawn one process for each CPU core on your machine. Each CPU core can execute one process simultaneously.
If you want to map a list to a single function you would do this:
args = [A, B]
results = pool.map(solve1, args)
Don't u...
Which CheckedListBox event triggers after a item is checked?
....Unchecked)
// The collection is about to be emptied: there's just one item checked, and it's being unchecked at this moment
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else
// The collection will not be empty once this click is handled
...
}
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Determining if a number is either a multiple of ten or within a particular set of ranges
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For the first one, to check if a number is a multiple of use:
if (num % 10 == 0) // It's divisible by 10
For the second one:
if(((num - 1) / 10) % 2 == 1 && num <= 100)
But that's rather dense, and you might be better off ...
How do I move a redis database from one server to another?
... This saved me a lot of time by showing that importing into redis is done by dropping the dump into the redis folder
– RonnyKnoxville
Dec 2 '14 at 10:38
7
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Script to get the HTTP status code of a list of urls?
...l -o /dev/null --silent --head --write-out "%{http_code} $LINE\n" "$LINE"
done < url-list.txt
(Eagle-eyed readers will notice that this uses one curl process per URL, which imposes fork and TCP connection penalties. It would be faster if multiple URLs were combined in a single curl, but there i...
What is the garbage collector in Java?
... taken care of by the garbage collector, but in other languages such as C, one needs to perform memory management on their own using functions such as malloc and free. Memory management is one of those things which are easy to make mistakes, which can lead to what are called memory leaks -- places w...
Why isn't `int pow(int base, int exponent)` in the standard C++ libraries?
...stionable whether floating point is desirable in that arena at all.
Since one of its initial use cases was to code up UNIX, the floating point would have been next to useless. BCPL, on which C was based, also had no use for powers (it didn't have floating point at all, from memory).
As an aside...
SqlDataAdapter vs SqlDataReader
...useful for updating back to the database
On the other hand, it:
Only has one record in memory at a time rather than an entire result set (this can be HUGE)
Is about as fast as you can get for that one iteration
Allows you start processing results sooner (once the first record is available). For so...