diff --git a/activerecord/lib/active_record/tasks/firebird_database_tasks.rb b/activerecord/lib/active_record/tasks/firebird_database_tasks.rb
index 86bf17f142..98014a38ea 100644
--- a/activerecord/lib/active_record/tasks/firebird_database_tasks.rb
+++ b/activerecord/lib/active_record/tasks/firebird_database_tasks.rb
@@ -4,6 +4,7 @@ module ActiveRecord
       delegate :connection, :establish_connection, to: ActiveRecord::Base
 
       def initialize(configuration)
+        ActiveSupport::Deprecation.warn "This database tasks were deprecated, because this tasks should be served by the 3rd party adapter."
         @configuration = configuration
       end
 
diff --git a/activerecord/lib/active_record/tasks/oracle_database_tasks.rb b/activerecord/lib/active_record/tasks/oracle_database_tasks.rb
index 780fc1fd99..de3aa50e5e 100644
--- a/activerecord/lib/active_record/tasks/oracle_database_tasks.rb
+++ b/activerecord/lib/active_record/tasks/oracle_database_tasks.rb
@@ -4,6 +4,7 @@ module ActiveRecord
       delegate :connection, :establish_connection, to: ActiveRecord::Base
 
       def initialize(configuration)
+        ActiveSupport::Deprecation.warn "This database tasks were deprecated, because this tasks should be served by the 3rd party adapter."
         @configuration = configuration
       end
 
diff --git a/activerecord/lib/active_record/tasks/sqlserver_database_tasks.rb b/activerecord/lib/active_record/tasks/sqlserver_database_tasks.rb
index 011954d136..c718ee03a8 100644
--- a/activerecord/lib/active_record/tasks/sqlserver_database_tasks.rb
+++ b/activerecord/lib/active_record/tasks/sqlserver_database_tasks.rb
@@ -6,6 +6,7 @@ module ActiveRecord
       delegate :connection, :establish_connection, to: ActiveRecord::Base
 
       def initialize(configuration)
+        ActiveSupport::Deprecation.warn "This database tasks were deprecated, because this tasks should be served by the 3rd party adapter."
         @configuration = configuration
       end