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Memcached vs. Redis? [closed]
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Summary (TL;DR)
Updated June 3rd, 2017
Redis is more powerful, more popular, and better supported than memcached. Memcached can only do a small fraction of the things Redis can do. Redis is better even where their features overlap.
For anything new, use Redis....
What is the difference between trie and radix trie data structures?
...looking at them in binary, since PATRICIA is a binary algorithm.
smile: 0111 0011 0110 1101 0110 1001 0110 1100 0110 0101 0000 0000 0000 0000
smiled: 0111 0011 0110 1101 0110 1001 0110 1100 0110 0101 0110 0100 0000 0000
smiles: 0111 0011 0110 1101 0110 1001 0110 1100 0110 0101 ...
demystify Flask app.secret_key
...port os
>>> os.urandom(24)
'\xfd{H\xe5<\x95\xf9\xe3\x96.5\xd1\x01O<!\xd5\xa2\xa0\x9fR"\xa1\xa8'
You copy the key and paste it in your configuration file as the value of SECRET_KEY.
Short of using a key that was randomly generated, you could use a complex assortment of words, number...
mmap() vs. reading blocks
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The upshot is that, on my (modern Intel, circa 2018) hardware, mmap has lower overhead than read for larger-than-page-sized (4 KiB) reads. Now it's very true that if you want to access data sparsely and randomly, mmap is really, really good - but the converse isn't necessa...
For-each over an array in JavaScript
...e of why it might bite you.
Your best bets are usually
a for-of loop (ES2015+ only),
Array#forEach (spec | MDN) (or its relatives some and such) (ES5+ only),
a simple old-fashioned for loop,
or for-in with safeguards.
But there's lots more to explore, read on...
JavaScript has powerful seman...
Append an object to a list in R in amortized constant time, O(1)?
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R>
That works on vectors too, so do I get the bonus points?
Edit (2015-Feb-01): This post is coming up on its fifth birthday. Some kind readers keep repeating any shortcomings with it, so by all means also see some of the comments below. One suggestion for list types:
newlist <- list(ol...
Concurrent vs serial queues in GCD
... DarlingtonStephen Darlington
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insert vs emplace vs operator[] in c++ map
...ect.
– underscore_d
Dec 2 '18 at 21:01
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What's so bad about Template Haskell?
...mstrdflemstr
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Database development mistakes made by application developers [closed]
...userid = t3.userid AND t3.roleid = 3
AND t1.roleid = 1
Query time: 0.016 s
That's right. The join version I
proposed is twenty times faster than
the aggregate version.
6. Not simplifying complex queries through views
Not all database vendors support views but for those that do, the...