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Skip certain tables with mysqldump
...table=schema.table2 > db-data.sql
The resulting two files are structurally sound but the dumped data is now ~500MB rather than 9GB, much better for me. I can now import these two files into another database for testing purposes without having to worry about manipulating 9GB of data or running o...
Your build failed due to an error in the AAPT stage, not because of an...
...一名称该项目正在使用不兼容或过时的扩展（请咨询扩展开发人员）该项目已使用非 App Inventor IDE 保存，使其不兼容不支持浏览器 - 使用 FireFox、Chrome 或 Safari（最新版本）互联网连接不是最佳的网络防火墙正在阻止 App Inventor
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Multi-statement Table Valued Function vs Inline Table Valued Function
...e compiler cannot use any table statistics on the tables in the MSTVF. So, all things being equal, (which they rarely are), the ITVF will perform better than the MSTVF. In my tests, the performance difference in completion time was negligible however from a statistics standpoint, it was noticeable.
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Queries vs. Filters
...erefore faster than queries. Have a look here too. Let's say a query is usually something that the users type and pretty much unpredictable, while filters help users narrowing down the search results , for example using facets.
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Python != operation vs “is not”
...right hand side and the left hand side are the very same object. No methodcalls are done, objects can't influence the is operation.
You use is (and is not) for singletons, like None, where you don't care about objects that might want to pretend to be None or where you want to protect against object...
创业者只需要一种素质：成为某个领域的意见领袖 - 资讯 - 清泛网 - 专注C/C...
...吧。的确，“6个月”常常被用来指代创业公司埋头苦干开发产品的那个阶段，要在6个月里坚持不懈，克服困难，把自己的梦想变为现实，别说那些高精尖的科技产品，就像小零食这样的产品，笔者就看到一位创业的朋友用了半...
String concatenation: concat() vs “+” operator
...then throwing it away when you create the final String. In practice memory allocation is surprisingly fast.
Update: As Pawel Adamski notes, performance has changed in more recent HotSpot. javac still produces exactly the same code, but the bytecode compiler cheats. Simple testing entirely fails bec...
'printf' vs. 'cout' in C++
...letely on operator overloading, so there is no issue with custom formats - all you do is define a subroutine taking std::ostream as the first argument and your type as second. As such, there are no namespace problems - as long you have a class (which isn't limited to one character), you can have wor...
Date vs DateTime
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Unfortunately, not in the .Net BCL. Dates are usually represented as a DateTime object with the time set to midnight.
As you can guess, this means that you have all the attendant timezone issues around it, even though for a Date object you'd want absolutely no timezone han...
linux 下巧妙使用squid代理服务器 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...性能高和效率快等特点。Squid是一个由众多在互联网上的开发人员共同努力完成的高性能的代理缓冲服务器，它的具体开发是由国家网络应用研究室（the National Laboratory for Applied Network Research）的Duane Wessels主持，由NSF出资支持的...