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Is it a good idea to index datetime field in mysql?
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Here author performed tests showed that integer unix timestamp is better than DateTime. Note, he used MySql. But I feel no matter what DB engine you use comparing integers are slightly faster than comparing dates so int index is better than DateTime index. Take T1 - time o...
Why is no one using make for Java?
... The tooling comment is an interesting one. make comes from a UNIX background so the tooling is done by writing useful compact utilities and pipelining them together. This is why most of the stitching is done using shell commands.
– D.Shawley
Feb 5...
Difference between subprocess.Popen and os.system
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os.system is equivalent to Unix system command, while subprocess was a helper module created to provide many of the facilities provided by the Popen commands with an easier and controllable interface. Those were designed similar to the Unix Popen comma...
What is the single most influential book every programmer should read? [closed]
...High Tech Products Drive Us Crazy and How to Restore the Sanity
The Art of Unix Programming
Test-Driven Development: By Example by Kent Beck
Practices of an Agile Developer
Don't Make Me Think
Agile Software Development, Principles, Patterns, and Practices by Robert C. Martin
Domain Driven Designs b...
How to clear gradle cache?
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Gradle cache locates at
On Windows: %USER_HOME%\.gradle/caches/
On Mac/Unix: ~/.gradle/caches/
You can browse to these directory and manually delete it or run
rm -rf $HOME/.gradle/caches/
on Unix system. Run this command will also force to download dependencies.
Update 2: Clear the Androi...
Why do I get a warning every time I use malloc?
...of looking your functions up in help.
Most help for C is modelled on the unix manual pages.
Using :
man malloc
gives pretty useful results.
Googling man malloc will show you what I mean.
In unix you also get apropos for things that are related.
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Run an untrusted C program in a sandbox in Linux that prevents it from opening files, forking, etc.?
... requires patching the kernel.
It is also possible to create a sandbox on Unix-like systems using chroot(1), although that is not quite as easy or secure. Linux Containers and FreeBSD jails are a better alternative to chroot. Another alternative on Linux is to use a security framework like SELinux ...
How to edit log message already committed in Subversion?
...y log messages because they are unversioned and will be lost permanently.
Unix-hosted SVN
Go to the hooks directory on your Subversion server (replace ~/svn/reponame with the directory of your repository)
cd ~/svn/reponame/hooks
Remove the extension
mv pre-revprop-change.tmpl pre-revprop-chang...
What are the differences between various threading synchronization options in C#?
...lly also exist in .NET as WaitHandles. The Pulse/Wait model is similar to Unix's pthread_signal and pthread_wait but are faster because they can be entirely user-mode operations in the un-contended case.
Monitor.Pulse/Wait is simple to use. In one thread, we lock an object, check a flag/state/pro...
How would I get a cron job to run every 30 minutes?
...awes: I've also used */xx with success in the past, but on Linux and other UNIXes. I've not personally tried Mac OSX. The original question didn't say which OS. Some older UNIXes don't support */xx
– Eddie
Feb 25 '09 at 6:03
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