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记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...些警告信息：
WARNING: You are running on a NUMA machine. We suggest launching mongod like this to avoid performance problems: numactl –interleave=all mongod [other options]
当时我并不太清楚NUMA是什么东西，所以没有处理，只是把问题反馈给了运维人员，后...
How do I import a Swift file from another Swift file?
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answered Jun 4 '14 at 18:56
H6.H6.
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What is your single most favorite command-line trick using Bash? [closed]
...ning bind -p to see all of your keyboard shortcuts listed? There are over 455 on Mac OS X by default.
105 Answers
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Explode string by one or more spaces or tabs
How can I explode a string by one or more spaces or tabs?
10 Answers
10
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How to change time and timezone in iPhone simulator?
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edited Sep 25 '14 at 7:11
Jayprakash Dubey
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What is the difference between the Facade and Adapter Pattern?
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142
The Facade Pattern wiki page has a brief note about this.
"An Adapter is used when the wr...
Why seal a class?
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41
Sometimes classes are too precious and not designed to be inherited.
Runtime/Reflection can ma...
Attach a file from MemoryStream to a MailMessage in C#
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edited Jul 4 '18 at 12:26
hsimah
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ans...
Test whether string is a valid integer
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184
[[ $var =~ ^-?[0-9]+$ ]]
The ^ indicates the beginning of the input pattern
The - is a litera...
FIND_IN_SET() vs IN()
... UNION ALL
SELECT 3 AS pos
UNION ALL
SELECT 4 AS pos
UNION ALL
SELECT 5 AS pos
) q
JOIN company
ON companyID = CAST(NULLIF(SUBSTRING_INDEX(attachedCompanyIDs, ',', -pos), SUBSTRING_INDEX(attachedCompanyIDs, ',', 1 - pos)) AS UNSIGNED)
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