Drupal — Database
Connection errors, slow queries, deadlocks — finding the cause from logs.
Drupal site down — database connection refused (PDOException 2002 / 1045)
Your Drupal site is gone.…
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Drupal slow queries — drilling from total count to the calling module
You already know your Drupal site has slow queries. Pages take 4–8 seconds, /admin/content hangs, cron leaks past 20 minutes, SHOW PROCESSLIST shows the same SE…
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Drupal slow queries — identifying the offending view or entity query
A category page that used to render in 400ms now takes seven, eight, sometimes twelve seconds. Admin overview tables crawl. A specific node listing hangs the ed…
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