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Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12
... the crash you may need to setup a swap space for your micro instance. Actually performance wise is better to enable swap.
Steps below show how to make a swap space for your Micro instance. I assume you have AWS Account with a Micro instance running.
Run dd if=/dev/zero of=/swapfile bs=1M count=102...
Can I grep only the first n lines of a file?
... Is there a way to do this when using grep's -l option? I'd like to list all the files who's first 5 characters are RIFFD.
– James M. Lay
May 23 '17 at 19:20
add a comment
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Populating Spring @Value during Unit Test
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Or even without Spring dependencies at all by changing the field to default access (package protected) to make it simply accessible to the test.
– Arne Burmeister
Jan 13 '16 at 10:03
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What's the best practice for primary keys in tables?
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I follow a few rules:
Primary keys should be as small as necessary. Prefer a numeric type because numeric types are stored in a much more compact format than character formats. This is because most primary keys will be foreign keys in another table as well as used in multipl...
Get selected text from a drop-down list (select box) using jQuery
... comment about is() returning a boolen; alternatively, use the following small alteration: $('#yourdropdownid').children("option:selected").text();
– scubbo
Jun 12 '12 at 14:56
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Git undo local branch delete
...o recover from this kind of error.
EDIT: By the way, don't run git gc (or allow it to run by itself - i.e. don't run git fetch or anything similar) or you may lose your commits for ever.
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im...
How is TeamViewer so fast?
...ant to transmit static images but only changes to the images, which essentially is analogous to video stream.
My best guess is some very efficient (and heavily specialized and optimized) motion compensation algorithm, because most of the actual change in generic desktop usage is linear movement of ...
php中json_decode()和json_encode()的使用方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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echo "Unicode: ", json_encode($a, JSON_UNESCAPED_UNICODE), "\n";
echo "All: ", json_encode($a, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE), "\n\n";
$b = array();
echo "Empty array output as array: ", json_encode($b), "\n";
echo "Empty array out...
Heroku “psql: FATAL: remaining connection slots are reserved for non-replication superuser connectio
I'm developing an app on Heroku with a Postgresql backend. Periodically, I get this error message when trying to access the database, both from the CLI and from loading a page on the server:
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How can I strip first and last double quotes?
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If you can't assume that all the strings you process have double quotes you can use something like this:
if string.startswith('"') and string.endswith('"'):
string = string[1:-1]
Edit:
I'm sure that you just used string as the variable name f...