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淘宝大秒系统设计详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...中。
按照某种维度建的索引产生热点数据，比如实时搜索中按照商品维度关联评价数据，有些热点商品的评价非常多，导致搜索系统按照商品ID建评价数据的索引时内存已经放不下，交易维度关联订单信息也同样有这些问题...
Generating random strings with T-SQL
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Do not use RIGHT/SUBSTRING to truncate an UUID since it will be neither unique nor random due to the way UUIDs are generated!
– ooxi
Apr 11 '14 at 7:42
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How to generate a new Guid in stored procedure?
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In MySQL it is UUID().
so the query would be:
insert into cars
(id, Make, Model)
values(UUID(), "Ford", "Mustang")
if you want to reuse the uuid you can do it like this:
set @id=UUID();
insert into cars
(id, Make, Model)
values(@id, "Fo...
How to handle many-to-many relationships in a RESTful API?
...going to make that easier.
Relationship IDs probably ought to be based on UUIDs or something equally long and random, irrespective of whatever type of IDs you use for teams and players. That will let you use the same UUID as the ID component for each end of the relationship without worrying about c...
Rails: How can I set default values in ActiveRecord?
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You can also pass a lambda to the default parameter. Example:
attribute :uuid, :string, default: -> { SecureRandom.uuid }
The second argument is the type and it can also be a custom type class instance, for example:
attribute :uuid, UuidType.new, default: -> { SecureRandom.uuid }
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do N times (declarative syntax)
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For piece of mind I ran a uuid function 50k times to make sure it never duplicated a uuid. So I profiled the top loop vs the bottom just for kicks, just running in the middle of a normal page load using chrome dev tools if im not being dumb I think it...
Client-server synchronization pattern / algorithm?
...ique when items could be created on different devices. I didn't know about UUIDs when I started this, so I used auto-incrementing IDs and wrote some convoluted code that runs on the central server to check new IDs uploaded from devices, change them to a unique ID if there's a conflict, and tell the ...
How to manage local vs production settings in Django?
...ose to (successfully!) use your solution, with a slight difference: I used uuid.getnode() to find uuid of my system. So I'm testing if uuid.getnode() == 12345678901 (actually a different number) instead of the os.environ test you used. I couldn't find documenation to convince me that os.environ['COM...
LR性能测试结果样例分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...法找到。
500 100 内部服务器错误：ASP 错误。
501 标题值指定的配置没有执行。
502 Web 服务器作为网关或代理服务器时收到无效的响应。
并发数分析
“Running Vusers（运行的并发数）”显示了在场景执行过程中并发数...
背包：将代码块复制并粘贴到不同的屏幕和项目 · App Inventor 2 中文网
...组件时也会发生这种情况。 通过添加缺少的组件并为其指定与粘贴块中引用的名称相同的名称，可以删除（修复）错误。
可以从背包中移除代码块吗？
要从背包中移除所有块，请右键单击背包，然后选择“清空背包”。 要...