From 0306f82e0c3cda3aad1b45eb0c3a359c254b62cc Mon Sep 17 00:00:00 2001
From: Xavier Noria <fxn@hashref.com>
Date: Fri, 2 Dec 2011 04:32:18 -0800
Subject: implements automatic EXPLAIN logging for slow queries

---
 activerecord/CHANGELOG.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'activerecord/CHANGELOG.md')

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index f798b03ea1..9ffd085925 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,5 +1,16 @@
 ## Rails 3.2.0 (unreleased) ##
 
+*   Implements automatic EXPLAIN logging for slow queries.
+
+    A new configuration parameter `config.active_record.auto_explain_threshold_in_seconds`
+    determines what's to be considered a slow query. Setting that to `nil` disables
+    this feature. Defaults are 0.5 in development mode, and `nil` in test and production
+    modes.
+
+    As of this writing there's support for SQLite, MySQL (mysql2 adapter), and
+    PostgreSQL.
+
+    *fxn*
 
 *   Implemented ActiveRecord::Relation#pluck method
 
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