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Right query to get the current number of connections in a PostgreSQL DB
...t(*) from pg_stat_activity where pid <> pg_backend_pid() group by 1 order by 1;
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What is the IntelliJ shortcut key to create a javadoc comment?
... can also press Ctrl+Shift+A two times and begin typing Fix doc comment in order to find the action.
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MySQL maximum memory usage
...ld utilize ulimit, but you'd likely have to modify the way MySQL starts in order to impose this.
The best solution is to tune your server down, so that a combination of the usual MySQL memory settings will result in generally lower memory usage by your MySQL installation. This will of course hav...
Should I put #! (shebang) in Python scripts, and what form should it take?
... that will work, period. You don't need to worry about any of the guts in order to use it.
– SDsolar
Oct 17 '17 at 10:15
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Android TextWatcher.afterTextChanged vs TextWatcher.onTextChanged
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These events are called in the following order:
beforeTextChanged(CharSequence s, int start, int count, int after).
This means that the characters are about to be replaced with some new text. The text is uneditable.
Use: when you need to take a look at the old tex...
How to write binary data to stdout in python 3?
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Messes up order of writes when writing to stderr if using along with print(file=sys.stderr).
– Kotauskas
Jul 19 '19 at 10:16
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Are default enum values in C the same for all compilers?
...be character sets in which the letters are not in consecutive alphabetical order
– M.M
May 27 '19 at 5:25
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how can I see what ports mongo is listening on from mongo shell?
... port, it must be 27017. If the port is not 27017, I must know the port in order to connect. Sound right?
– jcollum
Feb 19 '12 at 18:01
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Rails “validates_uniqueness_of” Case Sensitivity
...hreaded server. That's because you might get this sequence of events (the order is important):
Process A gets a request to create a new user with the name 'foo'
Process B does the same thing
Process A validates the uniqueness of 'foo' by asking the DB if that name exists yet and the DB says the n...
What is Dispatcher Servlet in Spring?
...ontrollers and DispatcherServlet refers to one of the following mappers in order to determine the target controller:
BeanNameUrlHandlerMapping;
ControllerBeanNameHandlerMapping;
ControllerClassNameHandlerMapping;
DefaultAnnotationHandlerMapping;
SimpleUrlHandlerMapping.
If no configuration is pe...