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记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...了验证这种可能，我搜索了一下MongoDB日志：
shell> grep FileAllocator /path/to/log
[FileAllocator] allocating new datafile ... filling with zeroes...
[FileAllocator] done allocating datafile ... took ... secs
我使用的文件系统是ext4（xfs也不错 ），创建数据文...
How to save a list as numpy array in python?
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You want to save it as a file?
import numpy as np
myList = [1, 2, 3]
np.array(myList).dump(open('array.npy', 'wb'))
... and then read:
myArray = np.load(open('array.npy', 'rb'))
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Where does mongodb stand in the CAP theorem?
...ynchronized to the secondaries will be rolled back and saved to a rollback-file, as soon as it reconnects to the set(the old primary is a secondary now). So in this case some consistency is sacrificed for the sake of availability.
Partition Tolerance:
Through the use of said Replica-Sets MongoDB a...
How to check which version of v8 is installed with my NodeJS?
... an argument onto this, it will increment the version in your package.json file, make and tag a git commit. Utterly bizarre UX, but this is useful.
– mitchell_st
Mar 2 '17 at 19:53
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Where are sudo incidents reported? [closed]
...inistrator. Also, sure, once some forwarding is set, you can cat the spool file, but you can also use some mail client, like mail, nail, or something else that supports reading from the local spool (I'd say that this is usually the case except maybe for GUI clients "imported" from the Windows world)...
You have already activated rake 0.9.0, but your Gemfile requires rake 0.8.7
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First, check to make sure that rake is mentioned in your Gemfile. If it's not, add it, and specify the version "you already activated".
Then, you'll need to tell bundle to update the rake version it's using for your app:
bundle update rake
It'll update your Gemfile.lock for you.
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Ways to save enums in database
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But what happens if you updated Boolean?
public enum Boolean {
TRUE, FILE_NOT_FOUND, FALSE
}
This means all your lies will become misinterpreted as 'file-not-found'
Better to just use a string representation
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Why all the Active Record hate? [closed]
...QL is also grown-up now)
A2) very often, there is more than a data store: file system (blobs in database are not always a good decision...), legacy systems (imagine yourself "how" they will be accessed, many varieties possible.. but thats not the point...)
B) database access layer (at this level, ...
Programmatically set left drawable in a TextView
...y
calling the icons based on the events
textViewContext.setText("File Uploaded");
textViewContext.setCompoundDrawablesWithIntrinsicBounds(R.drawable.uploaded, 0, 0, 0);
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How to change shape color dynamically?
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Where should round_button_shape define in shape xml file ?
– Jayesh
Nov 19 '18 at 10:41
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