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Run MySQLDump without Locking Tables
...erts in the case of MyISAM tables. For
transactional tables such as InnoDB and BDB, --single-transaction is
a much better option, because it does not need to lock the tables at
all.
For innodb DB:
mysqldump --single-transaction=TRUE -u username -p DB
...
Redefining NULL
I'm writing C code for a system where address 0x0000 is valid and contains port I/O. Therefore, any possible bugs that access a NULL pointer will remain undetected and at the same time cause dangerous behaviour.
...
Should a return statement be inside or outside a lock?
... that in some place in my code I have the return statement inside the lock and sometime outside. Which one is the best?
9 A...
Find the IP address of the client in an SSH session
...
@cwd i want to replace the ip in this command "iptables -A INPUT -s 93.203.118.251 -p tcp --destination-port 443 -j DROP" is that possible?
– wutzebaer
Aug 5 '15 at 13:00
...
Override devise registrations controller
... # add custom create logic here
end
def update
super
end
end
And then tell devise to use that controller instead of the default with:
# app/config/routes.rb
devise_for :users, :controllers => {:registrations => "registrations"}
...
C++ code file extension? .cc vs .cpp [closed]
I have seen C++ code saved as both .cc and .cpp files. Is there a difference between the two?
17 Answers
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PHP编译安装时常见错误解决办法，php编译常见错误 - 更多技术 - 清泛网 - ...
...ICU prefix or /usr/bin/icu-config failed. Please verify ICU install prefix and make sure icu-config works.
代码如下:
yum -y install libicu-devel
configure: error: utf8mime2text() has new signature, but U8TCANONICAL is missing. This should not happen. Check config.log for additional informat...
Apply CSS Style to child elements
...d by a div element with a class named test, in addition to all td elements and all caption elements.
It is not the same as "all td, th and caption elements which are contained by a div element with a class of test". To accomplish that you need to change your selectors:
'>' isn't fully supporte...
Convert two lists into a dictionary
...onary)
{'a': 1, 'b': 2, 'c': 3}
Voila :-) The pairwise dict constructor and zip function are awesomely useful: https://docs.python.org/3/library/functions.html#func-dict
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Favourite performance tuning tricks [closed]
...
Here is the handy-dandy list of things I always give to someone asking me about optimisation.
We mainly use Sybase, but most of the advice will apply across the board.
SQL Server, for example, comes with a host of performance monitorin...