I just saw this:
This site is currently in read-only mode; we’ll return with full functionality soon.
What happened? Was there some sort of hacking incident?
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From @stackstatus on Twitter:
We are failing over to our secondary SQL setup, there may be a slight interruption. #stackoverflow #stackexchange
Its probably related to that
And scrolling a little further down the Twitter timeline I ran into this from Nick Craver:
Typically we have thousands of plans in cache, but after a routing job, it’s as if caching has been disabled #sqlhelp
The best place to check for a current answer to this question seems to be to check @stackstatus on Twitter.