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How unique is UUID?
How safe is it to use UUID to uniquely identify something (I'm using it for files uploaded to the server)? As I understand it, it is based off random numbers. However, it seems to me that given enough time, it would eventually repeat it self, just by pure chance. Is there a better system or a patter...
How good is Java's UUID.randomUUID?
I know that randomized UUIDs have a very, very, very low probability for collision in theory, but I am wondering, in practice, how good Java's randomUUID() is in terms of not having collision? Does anybody have any experience to share?
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如何给个人博客或者网站添加Google广告 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...。当想好广告配置后，便可以按照“广告布局代码”和“搜索代码”中的说明来操作，然后便能将代码粘贴到你的网站中了。代码粘贴好了之后，便可以向网站投放Google广告，并能获得“站长搜索”服务。站长搜索为网站提供一...
I need to generate uuid for my rails application. What are the options(gems) I have? [duplicate]
...dditional dependencies and use SecureRandom which is builtin:
SecureRandom.uuid #=> "1ca71cd6-08c4-4855-9381-2f41aeffe59c"
See other possible formats here.
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How do I change the UUID of a virtual disk?
... displays an error saying the virtual hard disk cannot be used because the UUID already exists.
9 Answers
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【Mysql】报mysqli_real_connect(): (HY000/2002)错误 - 数据库(内核) - 清...
...li_real_connect(): (HY000/2002)错误原因分析：手动编译安装mysql指定位置后，所有的mysql文件都在指定的目录或者data目录下面，而php默认只会通过 temp mysql.sock路径寻找soc...原因分析：
手动编译安装mysql指定位置后，所有的mysql文件都...
MongoDB副本集详解 优于以往的主从模式 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
... 相对于传统主从模式的优势
传统的主从模式，需要手工指定集群中的Master。
如果Master发生故障，一般都是人工介入，指定新的Master。
这个过程对于应用一般不是透明的，往往伴随着应用重新修改配置文件，重启应用服务器...
How to create a GUID/UUID using iOS
I want to be able to create a GUID/UUID on the iPhone and iPad.
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MongoDB数据导出导入工具：mongoexport,mongoimport - 大数据 & AI - 清泛...
...个collection导出成JSON格式或CSV格式的文件，可以通过参数指定导出的数据项；mongoimport将相应文件导入到collection中。一、导出工具mongoexport
Mongodb中的mongoexport工具可以把一个collection导出成JSON格式或CSV格式的文件。可以通过参数...
Can I use a function for a default value in MySql?
...app_users
BEFORE INSERT ON app_users
FOR EACH ROW
SET new.api_key = uuid();
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