User:SPage (WMF)/Bypassing the cache

Need to turn all this into actionable documentation.

Remove template parse operation on every page view

This was responsible for 90% of Revision::fetchFromConds queries seen at the enwiki master DB server, and perhaps 30% of overall enwiki master query load.

'guidedtour-tour-test-wikitext-description' is
 * 'A guider in your on-wiki tour can contain wikitext using onShow and parseDescription. Use it to create a wikilink to the |Guided tours documentation. Or an external link to GitHub, for instance.',

In turn MediaWiki:Guidedtour-help-url is
 * 'Help:Guided tours'

but this page doesn't exist on enwiki, which caused a master DB query hit. Tim Starling comments "it was a template fetch, the reason it hit the master is because the page didn't exist so the fallback case in Revision::newFromConds was hit"


 * If we created Help:Guided tours on enwiki would it have fixed the problem?


 * ?? The new login form does the same thing, including URLs like Help:Logging_in in parsed messages when they may not exist on the wiki in question.