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使用TokuMX配置Replica Set集群 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...细对比请参见《TokuMX vs. MongoDB 性能对比》。
下载地址：http://www.tokutek.com/tokumx-for-mongodb/
TokuMX目前只有Linux版本，下载完成后
解压(tar -zxvf xxxx.tar.gz)
进入bin目录，新建配置文件如：tokumx.conf （文件名随意）
内容如下：
lo...
Filter rows which contain a certain string
...verse)
# The data. Data expo 09. ASA Statistics Computing and Graphics
# http://stat-computing.org/dataexpo/2009/the-data.html
df <- read_csv("Downloads/2008.csv")
print(dim(df))
# [1] 7009728 29
benchmark(
"str_detect" = {df %>% filter(str_detect(Dest, 'MCO|BWI'))},
"grepl" = {df ...
How to go back (ctrl+z) in vi/vim
...do the last modification. (And Ctrl+R to redo it).
Read more about it at: http://vim.wikia.com/wiki/Undo_and_Redo
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Creating a singleton in Python
...ion of a class means and how to implement that definition. See for example http://code.activestate.com/recipes/498149/, which essentially recreates C-style structs in Python using metaclasses. The thread What are some (concrete) use-cases for metaclasses? also provides some examples, they generally ...
Intellij IDEA. Hide .iml files
... Types for OS X
Then add *.iml;*.idea; in the text box in the bottom:
http://blogs.jetbrains.com/idea/2011/04/intellij-idea-does-not-show-some-files-know-the-hiding-places/
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how do i remove a comma off the end of a string?
...
if(substr($str, -1, 1) == ',') {
$str = substr($str, 0, -1);
}
http://php.net/manual/en/function.substr.php
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Is there a MySQL command to convert a string to lowercase?
...
Did you try looking it up? Google, manual...
http://dev.mysql.com/doc/refman/5.1/en/string-functions.html#function_lower
mysql> SELECT LOWER('QUADRATICALLY');
-> 'quadratically'
...
A simple example for someone who wants to understand Dynamic Programming [closed]
...is a decent next step from the Fibonacci sequence in terms of complexity.
http://en.wikipedia.org/wiki/Levenshtein_distance
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Is there a command to undo git init?
...nd try the same commands.
rd is an alternative form of the rmdir command. http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/rmdir.mspx?mfr=true
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Convert String[] to comma separated string in java
...Android developers are probably looking for TextUtils.join
Android docs: http://developer.android.com/reference/android/text/TextUtils.html
Code:
String[] name = {"amit", "rahul", "surya"};
TextUtils.join(",",name)
shar...