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Distributed sequence number generation?
I've generally implemented sequence number generation using database sequences in the past.
13 Answers
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SQL Joins Vs SQL Subqueries (Performance)?
...ll with 100% certainty which is faster is to turn on performance tracking (IO Statistics is especially useful) and run them both. Make sure to clear your cache between runs!
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Learning Regular Expressions [closed]
I don't really understand regular expressions. Can you explain them to me in an easy-to-follow manner? If there are any online tools or books, could you also link to them?
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Can I run HTML files directly from GitHub, instead of just viewing their source?
....com/[user]/[repository]/[branch]/[filename.ext]
In your case .html extension
After:
Development (throttled)
https://raw.githack.com/[user]/[repository]/[branch]/[filename.ext]
Production (CDN)
https://rawcdn.githack.com/[user]/[repository]/[branch]/[filename.ext]
In your case .html extension...
Is an empty href valid?
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Although this question is already answered (tl;dr: yes, an empty href value is valid), none of the existing answers references the relevant specifications.
An empty string can’t be a URI. However, the href attribute doesn’t only take URIs ...
What does the “__block” keyword mean?
... their contents that are also used in blocks are copied, thus any modification done to these variables don't show outside the block. When they are marked with __block, the modifications done inside the block are also visible outside of it.
For an example and more info, see The __block Storage Type ...
How can I shift-select multiple checkboxes like GMail?
... wrote a self-contained demo that uses jquery:
$(document).ready(function() {
var $chkboxes = $('.chkbox');
var lastChecked = null;
$chkboxes.click(function(e) {
if (!lastChecked) {
lastChecked = this;
return;
}
if (e.shift...
Get OS-level system information
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You can get some limited memory information from the Runtime class. It really isn't exactly what you are looking for, but I thought I would provide it for the sake of completeness. Here is a small example. Edit: You can also get disk usage information from the java...
Iterating through a range of dates in Python
...rts to get Perl-one-linerish when you have a generator in a list comprehension.
22 Answers
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Howto: Clean a mysql InnoDB storage engine?
...file in the InnoDB infrastructure. It normally houses six types of information:
Table Data
Table Indexes
MVCC (Multiversioning Concurrency Control) Data
Rollback Segments
Undo Space
Table Metadata (Data Dictionary)
Double Write Buffer (background writing to prevent reliance on OS caching)
Inser...