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MySQL select 10 random rows from 600K rows fast
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I am getting fast queries (around 0.5 seconds) with a slow cpu, selecting 10 random rows in a 400K registers MySQL database non-cached 2Gb size. See here my code: Fast selection of random rows in MySQL
<?php
$time= microtime_float();
$sql='SELECT COUNT(*) FROM pages';
$rquery= B...
What is the best way to test for an empty string in Go?
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There was a time when I counted CPU cycles and reviewed the assembler that the C compiler produced and deeply understood the structure of C and Pascal strings... even with all the optimizations in the world len() requires just that little extra bit of work....
Completely uninstall PostgreSQL 9.0.4 from Mac OSX Lion?
...etting ./uninstall-postgresql.app/Contents/MacOS/uninstall-postgresql: Bad CPU type in executable... I completely forgot EDB apps are all 32-bit.
– msr_overflow
Dec 6 '19 at 21:23
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Difference between StringBuilder and StringBuffer
...ng and unlocking code for synchronization which will unnecessarily take up CPU time. Don't use locks unless it is required.
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Volatile boolean vs AtomicBoolean
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Aren't CPU caches the main factor for setting volatile? To ensure that the value read is actually what it was set to most recently
– jocull
Mar 11 '19 at 14:52
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How to paginate with Mongoose in Node.js?
....g. pageNumber above) increases, cursor.skip() will become slower and more CPU intensive. With larger collections, cursor.skip() may become IO bound.
To achieve pagination in a scaleable way combine a limit( ) along with at least one filter criterion, a createdOn date suits many purposes.
MyMode...
Exception thrown inside catch block - will it be caught again?
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System.exit is friendlier to the CPU! :-O But yes, okay, clearly this is a subjective criterion. Also, I didn't know you to be a code golfer. ;-)
– Chris Jester-Young
Sep 15 '11 at 23:30
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What is the string length of a GUID?
...back and forth in translating it. What you are suggesting is slightly more CPU intensive than just reading/writing the value, which is what you want in practice.
– LongChalk
May 14 '18 at 12:19
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How to get cumulative sum
...e actual execution plans, try it with set io statistics on and compare the cpu and actual times.
– Davos
Jan 24 '19 at 14:25
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婚庆O2O：领跑的企业也就只走到B轮 - 资讯 - 清泛网 - 专注C/C++及内核技术
...意思，很好玩？然并卵，怎么赚钱呐？如果不能解决这个问题，能叫商业创业吗？又不是过家家，自己嗨就行。当然如果只是闲着没事儿，想为爱晒幸福、秀恩爱的新人们多提供一些渠道，活着到也无妨。只是看你们撑的这么辛...