WAMP, localhost, Mediawiki: Cannot access the database

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Mediawiki on localhost

Since 2:42 PM on 14 March 2009, I have run a private wiki for myself on a WAMP stack--6.5 years and counting.

I have never had everything work perfectly right out of the box, but I have never been frustrated for too long. People have solved all of the basic problems more than once, and it has been just a matter of googling around long enough to debug the setup.

All that has changed.

Mediawiki 1.26, WAMPserver 2.5, and WAMPserver 3

Error Messages

Shorter version

Sorry! This site is experiencing technical difficulties.

Try waiting a few minutes and reloading.

(Cannot access the database)

With debugging and backtracking enabled

Cannot access the database: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. ())

Backtrace:

#0 C:\wamp\www\mediawiki\includes\db\LoadBalancer.php(842): DatabaseBase->reportConnectionError('Unknown error (...')
#1 C:\wamp\www\mediawiki\includes\db\LoadBalancer.php(537): LoadBalancer->reportConnectionError()
#2 C:\wamp\www\mediawiki\includes\GlobalFunctions.php(3631): LoadBalancer->getConnection(-1, Array, false)
#3 C:\wamp\www\mediawiki\includes\User.php(1208): wfGetDB(-1)
#4 C:\wamp\www\mediawiki\includes\User.php(397): User->loadFromDatabase(0)
#5 C:\wamp\www\mediawiki\includes\User.php(362): User->loadFromId(0)
#6 C:\wamp\www\mediawiki\includes\User.php(2459): User->load()
#7 C:\wamp\www\mediawiki\includes\User.php(1167): User->getToken(false)
#8 C:\wamp\www\mediawiki\includes\User.php(365): User->loadFromSession()
#9 C:\wamp\www\mediawiki\includes\User.php(2029): User->load()
#10 C:\wamp\www\mediawiki\includes\User.php(3204): User->getId()
#11 C:\wamp\www\mediawiki\includes\MediaWiki.php(627): User->isLoggedIn()
#12 C:\wamp\www\mediawiki\includes\MediaWiki.php(476): MediaWiki->main()
#13 C:\wamp\www\mediawiki\index.php(51): MediaWiki->run()
#14 {main}
reportConnectionError "Unknown error"

Not a code or configuration problem

Except for a few times when I shot myself in the foot while debugging, the proof that the PHP code base and my configuration are correct is that I can immediately obtain the page I want by reloading the page.

It is only on the first call after a long time (five minutes? ten?) of not accessing the wiki that the problem occurs.