diff --git a/frappe/custom/doctype/customize_form/customize_form.py b/frappe/custom/doctype/customize_form/customize_form.py
index 8d47a075ba..c8d1bb18b4 100644
--- a/frappe/custom/doctype/customize_form/customize_form.py
+++ b/frappe/custom/doctype/customize_form/customize_form.py
@@ -166,7 +166,6 @@ class CustomizeForm(Document):
 
 		self.flags.update_db = False
 		self.flags.rebuild_doctype_for_global_search = False
-
 		self.set_property_setters()
 		self.update_custom_fields()
 		self.set_name_translation()
@@ -362,13 +361,45 @@ class CustomizeForm(Document):
 
 	def validate_fieldtype_change(self, df, old_value, new_value):
 		allowed = False
+		self.check_length_for_fieldtypes = []
 		for allowed_changes in allowed_fieldtype_change:
 			if (old_value in allowed_changes and new_value in allowed_changes):
 				allowed = True
+				if frappe.db.type_map.get(old_value)[1] > frappe.db.type_map.get(new_value)[1]:
+					self.check_length_for_fieldtypes.append({'df': df, 'old_value': old_value})
+					self.validate_fieldtype_length()
+				else:
+					self.flags.update_db = True
 				break
 		if not allowed:
 			frappe.throw(_("Fieldtype cannot be changed from {0} to {1} in row {2}").format(old_value, new_value, df.idx))
 
+	def validate_fieldtype_length(self):
+		for field in self.check_length_for_fieldtypes:
+			df = field.get('df')
+			max_length = frappe.db.type_map.get(df.fieldtype)[1]
+			fieldname = df.fieldname
+			docs = frappe.db.sql('''
+				SELECT name, {fieldname}, LENGTH({fieldname}) AS len
+				FROM `tab{doctype}`
+				WHERE LENGTH({fieldname}) > {max_length}
+			'''.format(
+				fieldname = fieldname,
+				doctype = self.doc_type,
+				max_length = max_length
+			), as_dict = True)
+			links = []
+			label = df.label
+			for doc in docs:
+				links.append(frappe.utils.get_link_to_form(self.doc_type, doc.name))
+			links_str = ', '.join(links)
+
+			if docs:
+				frappe.throw(_('Value for field {0} is too long in {1}. Length should be lesser than {2} characters')
+					.format(frappe.bold(label), links_str, frappe.bold(max_length)), title=_('Data Too Long'), is_minimizable=len(docs) > 1)
+
+		self.flags.update_db = True
+
 	def reset_to_defaults(self):
 		if not self.doc_type:
 			return
diff --git a/frappe/database/mariadb/database.py b/frappe/database/mariadb/database.py
index cd053569f0..926425f857 100644
--- a/frappe/database/mariadb/database.py
+++ b/frappe/database/mariadb/database.py
@@ -33,7 +33,7 @@ class MariaDBDatabase(Database):
 			'Float':		('decimal', '18,6'),
 			'Percent':		('decimal', '18,6'),
 			'Check':		('int', '1'),
-			'Small Text':	('text', ''),
+			'Small Text':	('text', 65535),
 			'Long Text':	('longtext', ''),
 			'Code':			('longtext', ''),
 			'Text Editor':	('longtext', ''),
@@ -42,7 +42,7 @@ class MariaDBDatabase(Database):
 			'Date':			('date', ''),
 			'Datetime':		('datetime', '6'),
 			'Time':			('time', '6'),
-			'Text':			('text', ''),
+			'Text':			('text', 65535),
 			'Data':			('varchar', self.VARCHAR_LEN),
 			'Link':			('varchar', self.VARCHAR_LEN),
 			'Dynamic Link':	('varchar', self.VARCHAR_LEN),
diff --git a/frappe/database/schema.py b/frappe/database/schema.py
index 88cda9340b..73bdf32761 100644
--- a/frappe/database/schema.py
+++ b/frappe/database/schema.py
@@ -69,6 +69,7 @@ class DBTable:
 		lengths = {}
 		precisions = {}
 		uniques = {}
+		fieldtype = ''
 
 		# optional fields like _comments
 		if not self.meta.istable:
@@ -100,7 +101,7 @@ class DBTable:
 				filters={
 					"doc_type": self.doctype,
 					"doctype_or_field": "DocField",
-					"property": ["in", ["precision", "length", "unique"]]
+					"property": ["in", ["precision", "length", "unique", "fieldtype"]]
 				}):
 
 				if ps.property=="length":
@@ -112,10 +113,13 @@ class DBTable:
 				elif ps.property=="unique":
 					uniques[ps.field_name] = cint(ps.value)
 
+				if ps.property=="fieldtype":
+					fieldtype = ps.value
+
 		for f in fl:
 			self.columns[f['fieldname']] = DbColumn(self,
 				f['fieldname'],
-				f['fieldtype'],
+				fieldtype or f['fieldtype'],
 				lengths.get(f["fieldname"]) or f.get('length'),
 				f.get('default'),
 				f.get('search_index'),