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An excellent development aid. Will run "EXPLAIN" before each of your select queries in development, and provides a display which makes them easy to browse. In this fork, gemified and compatible with Rails 2 + 3.
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MIT-LICENSE
README
Rakefile
init.rb
query_reviewer_defaults.yml

README

QueryReviewer
=============

QueryReviewer is an advanced SQL query analyzer.  It accomplishes the following goals:

 * View all EXPLAIN output for all SELECT queries to generate a page (and optionally SHOW PROFILE ALL)
 * Rate a page's SQL usage into one of three categories: OK, WARNING, CRITICAL
 * Attach meaningful warnings to individual queries, and collections of queries
 * Display interactive summary on page

All you have to do is install it.  You can optionally run:
  rake query_reviewer:setup

Which will create config/query_reviewer.yml, see below for what these options mean.  If you don't have a config file,
the plugin will use the default in vendor/plugins/query_reviewer.


Configuration
=============

The configuration file allows you to set configuration parameters shared across all rails environment, as well as
overriding those shared parameteres with environment-specific parameters (such as disabling analysis on production!)

 * enabled: whether any output or query analysis is performed.  Set this false in production!
 * inject_view: controls whether the output automatically is injected before the </body> in HTML output.
 * profiling: when enabled, runs the MySQL SET PROFILING=1 for queries longer than the warn_duration_threshold / 2.0
 * production_data: whether the duration of a query should be taken into account (if you don't have real data, don't let query duration effect you!)

 * stack_trace_lines: number of lines of call stack to include in the "short" version of the stack trace
 * trace_includes_vendor: whether the "short" verison of the stack trace should include files in /vendor
 * trace_includes_lib: whether the "short" verison of the stack trace should include files in /lib

 * warn_severity: the severity of problem that merits "WARNING" status
 * critical_severity: the severity of problem that merits "CRITICAL" status

 * warn_query_count: the number of queries in a single request that merits "WARNING" status
 * critical_query_count: the number of queries in a single request that merits "CRITICAL" status

 * warn_duration_threshold: how long a query must take in seconds (float) before it's considered "WARNING"
 * critical_duration_threshold: how long a query must take in seconds (float) before it's considered "CRITICIAL"


Example
=======

If you disable the inject_view option, you'll need to manually put the analyzer's output into your view:

<%= query_review_output %>


Copyright (c) 2007-2008 Kongregate & David Stevenson, released under the MIT license
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