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How do MySQL indexes work?
... be useful - there's generally no point to index e.g. the frequency of the letter "L" per page.
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AI2 SideBar Extension
...e indicate the initial state of the CheckBox / the Switch. Only the first letter of the specification is evaluated, upper / lower case is irrelevant. No CheckBox / Switch is displayed for anything other than "T, t" or "F, f". When optional settings are omitted, the separator symbol ("::") mus...
what is the difference between OLE DB and ODBC data sources?
... both relational and non-relational databases. (Oracle, Sql-Server, Excel, raw files, etc)
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What is the most ridiculous pessimization you've seen? [closed]
...makes it too big.
Create lots of summary tables because recalculating from raw data is too slow.
Create columns with subfields to save space.
Denormalize into fields-as-an-array.
That's off the top of my head.
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PHP: How to generate a random, unique, alphanumeric string for use in a secret link?
...would it be possible to generate a random, unique string using numbers and letters for use in a verify link? Like when you create an account on a website, and it sends you an email with a link, and you have to click that link in order to verify your account
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Storing custom objects in an NSMutableArray in NSUserDefaults
...NSUserDefaults shouldn't be used for storage of large arrays (Core Data or raw SQLite should be used for that instead), but it's perfectly fine to stash small arrays of encoded objects there. In any case, the question was asking how to do this, which is what the above code provides. As far as the vo...
How to fix the uninitialized constant Rake::DSL problem on Heroku?
....9.1/rake.rb:2373:in `load'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2373:in `raw_load_rakefile'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2007:in `block in load_rakefile'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2058:in `standard_exception_handling'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2006:in `load_rakefil...
Are arrays passed by value or passed by reference in Java? [duplicate]
...eference semantics in C.
Since it can often seem like the sole purpose of raw pointers in C is to create crashing bugs, subs
How to multiply duration by integer?
... That's nice, but why is it possible to multiply a Duration by a raw integer (not in a variable), like: time.Sleep(100 * time.Millisecond) AFAIK, 100 is not a Duration
– carnicer
Jul 5 at 12:01
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Can a Windows batch file determine its own file name?
...ands %I to a fully qualified path name
%~dI - expands %I to a drive letter only
%~pI - expands %I to a path only
%~nI - expands %I to a file name only
%~xI - expands %I to a file extension only
%~sI - expanded path contains short names only
%~aI - expands %I...