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MySQL vs MongoDB 1000 reads
...nary json document)
So a b-tree lookup, and a binary page read. Log(n) + 1 IOs. If the indexes can reside entirely in memory, then 1 IO.
In MySQL with 20 tables, you have to perform:
One index lookup on the root table (again, assuming the entity is fetched by id)
With a clustered index, we can ...
Creating an empty file in Ruby: “touch” equivalent?
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182
FileUtils.touch looks like what it does, and mirrors* the touch command:
require 'fileutils'
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NuGet Package Manager errors when trying to update
Opening VS2010 today, the extension manager notified me of an update for NuGet Package Manager.
4 Answers
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PostgreSQL query to return results as a comma separated list
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Kaleem Ullah
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answered Aug 10 '12 at 15:09
sorinsorin
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Convert NSNumber to int in Objective-C
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193
Have a look at the documentation. Use the intValue method:
NSNumber *number = [dict objectFor...
Download large file in python with requests
...sts is a really nice library. I'd like to use it for download big files (>1GB).
The problem is it's not possible to keep whole file in memory I need to read it in chunks. And this is a problem with the following code
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Using os.walk() to recursively traverse directories in Python
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13 Answers
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Undo a particular commit in Git that's been pushed to remote repos
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1254
Identify the hash of the commit, using git log, then use git revert <commit> to create ...
Check if two linked lists merge. If so, where?
...anged list (i.e. the former beginning of the other list), he will make a+b+1 iterations total. Let's call it z+1.
The pointer that reached the merge-point first, will keep iterating, until reaches the end of the list. The number of iterations it made should be calculated and is equal to x.
Then,...