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ALTER TABLE without locking the table?
...n doing an ALTER TABLE statement in MySQL, the whole table is read-locked (allowing concurrent reads, but prohibiting concurrent writes) for the duration of the statement. If it's a big table, INSERT or UPDATE statements could be blocked for a looooong time. Is there a way to do a "hot alter", like ...
Memcache(d) vs. Varnish for speeding up 3 tier web architecture
...ache will provide info for pages that have a mixture of known and new data allowing you to generate pages faster.
An example that could apply to stackoverflow.com: adding this comment invalidated the page cache, so this page would have to be cleared from Varnish (and also my profile page, which pr...
How can Xcode 6 adaptive UIs be backwards-compatible with iOS 7 and iOS 6?
...se changed constraints are visible in the iPad Simulator running iOS 7.0.
All size class optimizations are made available to iOS 7, except size classes that have a Compact Height. This has been confirmed by Apple and is now stated directly in the documentation:
For apps supporting versions of iOS ...
Select rows of a matrix that meet a condition
... How does this work if you don't want to specify the column names at all but want to work over all columns in the matrix?
– user5359531
Jul 22 '16 at 22:54
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Disable Enable Trigger SQL server for a table
...nswered Sep 7 '09 at 7:54
Wael DalloulWael Dalloul
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What is the difference between a User Control Library and a Custom Control Library?
... control base classes and provide additional functionality through code so all the added logic and representation must be implemented inside the code.
A user control is technically a normal content control which you can extend in some parts in the code but usually it is extended by placing other c...
Error when testing on iOS simulator: Couldn't register with the bootstrap server
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As comment below says, you can usually see the hung process in Activity Monitor and kill it there.
– mxcl
Sep 5 '10 at 18:29
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rsync: difference between --size-only and --ignore-times
...cp's the file. However, what if the metadata do match but files aren't actually the same? Then rsync probably didn't do what you intended.
Files that are the same size may still have changed. One simple example is a text file where you correct a typo -- like changing "teh" to "the". The file size i...
What does the “Just” syntax mean in Haskell?
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It's actually just a normal data constructor that happens to be defined in the Prelude, which is the standard library that is imported automatically into every module.
What Maybe is, Structurally
The definition looks something like ...
Copy paste text into iOS simulator
...hich apps running on that device (simulator) use via the iOS pup-up select-all/copy/paste UI items.
Completely separate from that: your mac has it's own clipboard and content. The Simulator program running on your mac provides the Edit > Paste Text menu item. The program implements that menu ite...