大约有 15,208 项符合查询结果（耗时：0.0215秒） [XML]
When to use Hadoop, HBase, Hive and Pig?
...data loss (because of the replication). But, being a FS, HDFS lacks random read and write access. This is where HBase comes into picture. It's a distributed, scalable, big data store, modelled after Google's BigTable. It stores data as key/value pairs.
Coming to Hive. It provides us data warehousin...
SqlDataAdapter vs SqlDataReader
What are the differences between using SqlDataAdapter vs SqlDataReader for getting data from a DB?
5 Answers
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Writing a list to a file with Python
... For example because you want an output text file that can be easily read, edited, etc, with one item per line. Hardly a rare desire;-).
– Alex Martelli
May 23 '09 at 14:40
1...
SVG drop shadow using css3
...ilter:url(#dropshadow)"/>
Box-shadow is defined to work on CSS boxes (read: rectangles), while svg is a bit more expressive than just rectangles. Read the SVG Primer to learn a bit more about what you can do with SVG filters.
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How to find out if a file exists in C# / .NET?
...path) returns false even if the file exists BUT caller lacks permission to read it. Is there a different way to handle this kind of situations and check whether a file exists even if the caller cannot read it?
– ADTC
Mar 5 '12 at 8:06
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LINUX: Link all files from one to another directory [closed]
...try this:
cd /usr/lib
find /mnt/usr/lib -maxdepth 1 -print "%P\n" | while read file; do ln -s "/mnt/usr/lib/$file" "$file"; done
If you should happen to want to recursively create the directories and only link files (so that if you create a file within a directory, it really is in /usr/lib not /m...
On duplicate key ignore? [duplicate]
...nd You have to take into account potential performance hit. Instead of one read and potential one write You get read, write (delete row), write (insert row) and write(update index), so 1x read and 3x write (at best, if only one index is updated)..
– matt
Oct 18...
What is $@ in Bash? [duplicate]
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@vecvan number of questions before reading man bash: 1 ... number of questions after reading man bash: 12,031
– FloatingRock
Oct 29 '14 at 16:05
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Good beginners tutorial to socket.io? [closed]
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To start with Socket.IO I suggest you read first the example on the main page:
http://socket.io/
On the server side, read the "How to use" on the GitHub source page:
https://github.com/Automattic/socket.io
And on the client side:
https://github.com/Automatti...
Javascript date.getYear() returns 111 in 2011? [duplicate]
...nally (but it has since been updated to use getFullYear()). I would never read w3schools for anything :)
– JK.
Jul 24 '12 at 21:33
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