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MongoDB与内存 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
MongoDB与内存MongoDB-And-Memory但凡初次接触MongoDB的人，无不惊讶于它对内存的贪得无厌，至于个中缘由，我先讲讲Linux是如何管理内存的，再说说MongoDB是如何使用内存的...但凡初次接触MongoDB的人，无不惊讶于它对内存的贪得无厌，...
How can I disable ARC for a single file in a project?
I am using ARC successfully in my project. However, I have encountered a few files (e.g., in unit tests and mock objects) where the rules of ARC are a little more fragile right now. I recall hearing that there was a way to disable ARC on a per-file basis, though I have been unable to find this optio...
Passing multiple error classes to ruby's rescue clause in a DRY fashion
I have some code that needs to rescue multiple types of exceptions in ruby:
3 Answers
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Why do you need to invoke an anonymous function on the same line?
I was reading some posts about closures and saw this everywhere, but there is no clear explanation how it works - everytime I was just told to use it...:
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Can Powershell Run Commands in Parallel?
I have a powershell script to do some batch processing on a bunch of images and I'd like to do some parallel processing. Powershell seems to have some background processing options such as start-job, wait-job, etc, but the only good resource I found for doing parallel work was writing the text of a...
Calculate a Running Total in SQL Server
Imagine the following table (called TestTable ):
15 Answers
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PostgreSQL Crosstab Query
Does any one know how to create crosstab queries in PostgreSQL?
For example I have the following table:
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Where is the syntax for TypeScript comments documented?
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The right syntax is now the one used by TSDoc. It will allow you to have your comments understood by Visual Studio Code or other documentation tools.
A good overview of the syntax is available here and especially here. The precise spec should be "soon" written ...
Convert audio files to mp3 using ffmpeg
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You could use this command:
ffmpeg -i input.wav -vn -ar 44100 -ac 2 -b:a 192k output.mp3
Explanation of the used arguments in this example:
-i - input file
-vn - Disable video, to make sure no video (including album cover image) is included if the source would be a video file
-ar - Set the...
How can I get list of values from dict?
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edited Feb 6 '15 at 21:25
answered Apr 26 '13 at 3:27
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