rdavila-query_reviewer

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 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