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Postgresql: password authentication failed for user “postgres”
... FATAL: password authentication failed for user "postgres" then check the file /etc/postgresql/8.4/main/pg_hba.conf: There must be a line like this as the first non-comment line:
local all postgres ident
For newer versions of PostgreSQL ident actually might be ...
Error in strings.xml file in Android
...editing strings.xml and not values.xml (android studio directs you to this file when shows the error). Because if you edit values.xml and try to compile again, the error persists. This was happening to me recently.
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How to show math equations in general github's markdown(not github's blog)
...ve found mathjax can do this. But when I write some example in my markdown file, it doesn't show the correct equations:
10 ...
What's up with Java's “%n” in printf?
...m you are running on
C handles this differently. You can choose to open a file in either "text" or "binary" mode. If you open the file in binary mode \n will give you a "unix style" line ending and "\r\n" will give you a "dos style" line ending. If you open the file in "text" mode on a dos/windows ...
How do I execute a command and get the output of the command within C++ using POSIX?
...ay<char, 128> buffer;
std::string result;
std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd, "r"), pclose);
if (!pipe) {
throw std::runtime_error("popen() failed!");
}
while (fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr) {
resul...
Scanner vs. BufferedReader
...I know, the two most common methods of reading character-based data from a file in Java is using Scanner or BufferedReader . I also know that the BufferedReader reads files efficiently by using a buffer to avoid physical disk operations.
...
MSSQL Error 'The underlying provider failed on Open'
...Now I want to change the connection string so that there will be no .mdf file.
40 Answers
...
Create an empty data.frame
... vectors:
df <- data.frame(Date=as.Date(character()),
File=character(),
User=character(),
stringsAsFactors=FALSE)
Here's an other example with different column types :
df <- data.frame(Doubles=double(),
Ints=integer()...
Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12
...ve AWS Account with a Micro instance running.
Run dd if=/dev/zero of=/swapfile bs=1M count=1024
Run mkswap /swapfile
Run swapon /swapfile
Add this line /swapfile swap swap defaults 0 0 to /etc/fstab
Step 4 is needed if you would like to automatically enable swap file after each reboot.
Some useful...
How do I clone a subdirectory only of a Git repository?
...en do:
git config core.sparseCheckout true
Now you need to define which files/folders you want to actually check out. This is done by listing them in .git/info/sparse-checkout, eg:
echo "some/dir/" >> .git/info/sparse-checkout
echo "another/sub/tree" >> .git/info/sparse-checkout
La...