Obsolete:ishmael.wikimedia.org

ishmael.wikimedia.org was a visual tool to show MySQL statistics and analyze MySQL query logs. It has been superseded by Tendril and decommissioned in October 2015.

MySQL's slow query log is a file local to the DB that requires shell access to the db server - http://dev.mysql.com/doc/refman/5.0/en/slow-query-log.html describes it. Asher set up ishmael, a web tool to analyze slow queries, circa 2011.

In 2013, Asher wrote:

if you're interested in production query performance histograms, I recommend looking at those generated from random samples of all queries in addition to just those that make the slow query logs.

Links to both of those views for every db are provided on http://noc.wikimedia.org/dbtree/ .