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PostgreSQL ERROR: canceling statement due to conflict with recovery
...ows. Then secondary has to replay this cleanup, and has to forcibly cancel all queries which can use these rows.
Longer queries will be canceled more often.
You can work around this by starting a repeatable read transaction on primary which does a dummy query and then sits idle while a real query ...
How to avoid reinstalling packages when building Docker image for Python projects?
...ase
WORKDIR /srv
ADD ./requirements.txt /srv/requirements.txt
RUN pip install -r requirements.txt
ADD . /srv
RUN python setup.py install
ENTRYPOINT ["run_server"]
Docker will use cache during pip install as long as you do not make any changes to the requirements.txt, irrespective of the fact whet...
Reasons for using the set.seed function
...he set.seed function in R, before starting the program. I know it's basically used for the random number generation. Is there any specific need to set this?
...
How to move all files including hidden files into parent directory via *
...e set of solutions on this in UNIX & Linux's answer to How do you move all files (including hidden) from one directory to another?. It shows solutions in Bash, zsh, ksh93, standard (POSIX) sh, etc.
You can use these two commands together:
mv /path/subfolder/* /path/ # your current approach...
lose vim colorscheme in tmux mode
...
Personally I had to use set -g default-terminal "screen-256color" to work rather than xterm on OS X, sshed into an Ubuntu box. I referred to this site: rhnh.net/2011/08/20/vim-and-tmux-on-osx
– waffl
...
Override body style for content in an iframe
...e, I am hiding an element with a specific class in the inner iframe.
Basically, you just append a 'style' element to the 'head' of the inner iframe.
$('iframe').load( function() {
$('iframe').contents().find("head")
.append($("<style type='text/css'> .my-class{display:none;} <...
Yellow fade effect with JQuery
... probably because part of it is empty and text is set just before this is called?
– NaughtySquid
Mar 12 '16 at 18:14
N...
Add default value of datetime field in SQL Server to a timestamp
... that. You can name the constraint whatever you like, Management Studio usually names them DF_TableName.
– TheQ
Feb 3 '11 at 16:03
...
How does strtok() split the string into tokens in C?
... string into tokens. I am unable to understand from the manual what it actually does.
15 Answers
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Check existence of input argument in a Bash shell script
...
For a noob, especially someone who comes from a non-scripting background, it is also important to mention some peculiarities about these things. You could have also mentioned that we need a space after the opening and the closing brace. Otherw...