大约有 40,000 项符合查询结果（耗时：0.0594秒） [XML]
How could the UNIX sort command sort a very large file?
...or this purpose. On a 4 processor machine it improved the sort performance by 100% !
#! /bin/ksh
MAX_LINES_PER_CHUNK=1000000
ORIGINAL_FILE=$1
SORTED_FILE=$2
CHUNK_FILE_PREFIX=$ORIGINAL_FILE.split.
SORTED_CHUNK_FILES=$CHUNK_FILE_PREFIX*.sorted
usage ()
{
echo Parallel sort
echo usage: ps...
Is there a goto statement in Java?
...d, but it is marked as "not used".
It was in the original JVM (see answer by @VitaliiFedorenko), but then removed. It was probably kept as a reserved keyword in case it were to be added to a later version of Java.
If goto was not on the list, and it gets added to the language later on, existing co...
Nodejs send file in response
...
Here's an example program that will send myfile.mp3 by streaming it from disk (that is, it doesn't read the whole file into memory before sending the file). The server listens on port 2000.
[Update] As mentioned by @Aftershock in the comments, util.pump is gone and was replac...
Get the new record primary key ID from MySQL insert query?
...n the server on a per-connection basis. This means that the value returned by the function to a given client is the first AUTO_INCREMENT value generated for most recent statement affecting an AUTO_INCREMENT column by that client.
So the value returned by LAST_INSERT_ID() is per user and is unaffec...
Rails respond_with: how does it work?
...ils 3. But I can't even find a reference to it in either the Rails APIs or by searching the source. Can anyone either explain to me how it works (what options you can use, etc) or point me to the place it's actually implemented so I can peruse the code on my own?
...
psql: FATAL: database “” does not exist
...
psql -d template1
works for you is that template1 is a database created by postgres itself, and is present on all installations.
You are apparently able to log in to template1, so you must have some rights assigned to you by the database. Try this at a shell prompt:
createdb
and then see if y...
What is the most ridiculous pessimization you've seen? [closed]
...m launch.
Loading the same DLL hundreds or thousands of times
Wasting mega bytes of memory by keeping full paths to files needlessly
Not organizing data structures so they take up way more memory than they need
Sizing all strings that store file names or paths to MAX_PATH
Gratuitous polling for thin...
Can I get “&&” or “-and” to work in PowerShell?
... The quickest way to real frustration when learning PowerShell is to start by thinking that it is just an expanded CMD or bash. It has a fundamentally different model, epecially when it comes to input, output, piping, and results. Start with a good tutorial or overview, and don't try too hard to m...
Why use pip over easy_install? [closed]
...hon 2.7 and 3.4+ packages from python.org, and a pip bootstrap is included by default if you build from source.
The various incomplete bits of documentation on installing, using, and building packages have been replaced by the Python Packaging User Guide. Python's own documentation on Installing Pyt...
How do I break a string over multiple lines?
...
Using yaml folded style, each line break is replaced by a space. The indention in each line will be ignored. A line break will be inserted at the end.
Key: >
This is a very long sentence
that spans several lines in the YAML
but which will be rendered as a string
wit...