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Good reasons NOT to use a relational database?
... ability to validate the structure.
Spreadsheet / CSV file
Very easy model for business users to understand
Subversion (or similar disk based version control system)
Very good support for versioning of data
Berkeley DB (Basically, a disk based hashtable)
Very simple conceptually (j...
“Origin null is not allowed by Access-Control-Allow-Origin” error for request made by application ru
... @Uri: Depends on your HTTP server. With Apache, you'll want to look into mod_headers.
– ssokolow
Apr 8 '11 at 0:37
4
...
How big can a user agent string get?
... Apache limits the maximum field length to 8k (httpd.apache.org/docs/2.2/mod/core.html#limitrequestfieldsize).
– Gumbo
Mar 17 '09 at 17:11
...
mongodb: insert if not exists
...ldn't $setOnInsert with the _id field - it would say something like "can't Mod the _id field". This was a bug, fixed in v2.5.4 or there abouts. If you see this message or issue, just get the latest version.
– Kieren Johnstone
May 17 '15 at 20:16
...
从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...的构造器，通过“策略模式”实现，算法的组合。
新建文件：org.conan.mymahout.recommendation.job.RecommendFactory.java
public final class RecommendFactory {
...
}
1). 构造数据模型
public static DataModel buildDataModel(String file) throws TasteException, ...
What does “%” (percent) do in PowerShell?
... ForEach-Object
When used in the context of an equation, it's the modulus operator:
> 11 % 5
1
and as the modulus operator, % can also be used in an assignment operator (%=):
> $this = 11
> $this %= 5
> $this
1
...
Designing function f(f(n)) == -n
...move the integer that doesn't have a positive counterpart, we still have 2(mod4) numbers.
If we remove the 2 maximal numbers left (by abs value), we can get the function:
int sign(int n)
{
if(n>0)
return 1;
else
return -1;
}
int f(int n)
{
if(n==0) return 0;
sw...
How to send a command to all panes in tmux?
...ession, replace -a with -s (It's all in the tmux man page).
I haven't the mod points to comment directly on each of the above answers, so here's why they weren't working for me:
The problem that I had with @shailesh-garg 's answer was that the sync affected only commands issued within the panes, n...
App Inventor 2 字典代码块 · App Inventor 2 中文网
...= new QRCode("qrcode", { text: window.location.href + "?f=share", //URL地址 width: 150, height: 150, colorDark: '#000000', //二维码颜色 colorLight: "#ffffff" //背景颜色}); App Inventor 2 中文网 © 2023 - document.write(new Date().getFullYear()); 跟着...
What are the Ruby File.open modes and options?
Ruby's File.open takes modes and options as arguments. Where do I find a complete list of modes and options?
2 Answers
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