Developer Tools Devel Module

The Devel module is an indispensable tool for programmers and system administrators who want to know how Drupal accesses the database. It collects all of the SQL queries that are made during the loading of a page and shows them as output at the bottom of the screen, along with the time they took and whether the same query was called more than once. This is an excellent way to start to understand what goes on behind the scenes in Drupal, as well as a means for spotting bottlenecks in performance. The Devel module also defines a couple of helper functions to be used for debugging while programming, integrates with Xdebug ( to provide profiler information, and includes a number of scripts for generating dummy database data for the purposes of testing.

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