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How to 'insert if not exists' in MySQL?
I started by googling, and found this article which talks about mutex tables.
10 Answers
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MySQL maximum memory usage
...th EXPLAIN. Add to that that MySQL's EXPLAIN is really limited, but it's a start.
Suggested configurations
About these my-large.cnf and my-medium.cnf files -- I don't even know who those were written for. Roll your own.
Tuning primer
A great start is the tuning primer. It's a bash script (hint: ...
Structure padding and packing
... the order of the members will be preserved and that the first member will start at 0 offset.
– martinkunev
Dec 8 '17 at 14:32
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AngularJS and its use of Dollar Variables
...fixed properties, for example the 'json' filter will not output a variable starting with '$'.
– Schmuli
Dec 27 '12 at 20:48
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How can I recover the return value of a function passed to multiprocessing.Process?
...cess(target=worker, args=(i,return_dict))
jobs.append(p)
p.start()
for proc in jobs:
proc.join()
print return_dict.values()
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What is the difference between mutex and critical section?
...;
LARGE_INTEGER freq;
QueryPerformanceFrequency(&freq);
LARGE_INTEGER start, end;
// Force code into memory, so we don't see any effects of paging.
EnterCriticalSection(&critSec);
LeaveCriticalSection(&critSec);
QueryPerformanceCounter(&start);
for (int i = 0; i < 1000000; i++)
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How to benchmark efficiency of PHP script
...in the callgraph collected.
Once the extension is compiled and loaded you start profiling in the code with:
xhprof_enable(XHPROF_FLAGS_CPU + XHPROF_FLAGS_MEMORY);
To stop:
$xhprof_data = xhprof_disable();
Then save the data to a file, or database - whatever floats your boath and doesn't inter...
How to stop C++ console application from exiting immediately?
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If you are using Visual Studio and you are starting the console application out of the IDE:
pressing CTRL-F5 (start without debugging) will start the application and keep the console window open until you press any key.
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How to set entire application in portrait mode only?
...on subclass in your project. In its onCreate(), called when your app first starts up, you register an ActivityLifecycleCallbacks object (API level 14+) to receive notifications of activity lifecycle events.
This gives you the opportunity to execute your own code whenever any activity in your app is...
For homebrew mysql installs, where's my.cnf?
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There is no my.cnf by default. As such, MySQL starts with all of the default settings. If you want to create your own my.cnf to override any defaults, place it at /etc/my.cnf.
Also, you can run mysql --help and look through it for the conf locations listed.
Default op...