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20个命令行工具监控 Linux 系统性能 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...际原因。这些监控命令足够你选择适合你的监控场景。
1. top —Linux系统进程监控
top 命令是性能监控程序，它可以在很多 Linux/Unix 版本下使用，并且它也是 Linux 系统管理员经常使用的监控系统性能的工具。Top 命令可以定期显...
Return 0 if field is null in MySQL
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Use IFNULL:
IFNULL(expr1, 0)
From the documentation:
If expr1 is not NULL, IFNULL() returns expr1; otherwise it returns expr2. IFNULL() returns a numeric or string value, depending on the context in which it is used.
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How to strip all non-alphabetic characters from string in SQL Server?
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18 Answers
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A simple explanation of Naive Bayes Classification
...EN is smaller than Likelihood of X given RED, since the circle encompasses 1 GREEN object and 3 RED ones. Thus:
Although the prior probabilities indicate that X may belong to GREEN (given that there are twice as many GREEN compared to RED) the likelihood indicates otherwise; that the class memb...
Value of i for (i == -i && i != 0) to return true in Java
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126
The only int value for which it works is Integer.MIN_VALUE.
It's because integers are negate...
Truncating floats in Python
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First, the function, for those who just want some copy-and-paste code:
def truncate(f, n):
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How do I pass command-line arguments to a WinForms application?
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static void Main(string[] args)
{
// For the sake of this example, we're just printing the a...
Installing specific package versions with pip
I'm trying to install version 1.2.2 of the MySQL_python adaptor, using a fresh virtualenv created with the --no-site-packages option. The current version shown in PyPi is 1.2.3 . Is there a way to install the older version? I found an article stating that this should do it:
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What's quicker and better to determine if an array key exists in PHP?
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10 Answers
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