diff --git a/django/db/backends/mysql/base.py b/django/db/backends/mysql/base.py
index b2d9b649be0..5d1c023dcb7 100644
--- a/django/db/backends/mysql/base.py
+++ b/django/db/backends/mysql/base.py
@@ -50,10 +50,6 @@ from django.utils.safestring import SafeBytes, SafeText
 from django.utils import six
 from django.utils import timezone
 
-# Raise exceptions for database warnings if DEBUG is on
-if settings.DEBUG:
-    warnings.filterwarnings("error", category=Database.Warning)
-
 DatabaseError = Database.DatabaseError
 IntegrityError = Database.IntegrityError
 
diff --git a/docs/releases/1.8.txt b/docs/releases/1.8.txt
index 77ab5eec804..cbd63495c5e 100644
--- a/docs/releases/1.8.txt
+++ b/docs/releases/1.8.txt
@@ -774,6 +774,9 @@ Miscellaneous
   in ``django.test.utils`` were removed. Override ``TEMPLATE_LOADERS`` with
   ``override_settings`` instead.
 
+* Warnings from the MySQL database backend are no longer converted to
+  exceptions when :setting:`DEBUG` is ``True``.
+
 .. _deprecated-features-1.8:
 
 Features deprecated in 1.8