diff --git a/frappe/database/database.py b/frappe/database/database.py
index b083ff1014..364f0c73cd 100644
--- a/frappe/database/database.py
+++ b/frappe/database/database.py
@@ -769,7 +769,16 @@ class Database(object):
 		return ("tab" + doctype) in self.get_tables()
 
 	def get_tables(self):
-		return [d[0] for d in self.sql("select table_name from information_schema.tables where table_schema not in ('pg_catalog', 'information_schema')")]
+		tables = frappe.cache().get_value('db_tables')
+		if not tables:
+			table_rows = self.sql("""
+				SELECT table_name
+				FROM information_schema.tables
+				WHERE table_schema NOT IN ('pg_catalog', 'information_schema')
+			""")
+			tables = {d[0] for d in table_rows}
+			frappe.cache().set_value('db_tables', tables)
+		return tables
 
 	def a_row_exists(self, doctype):
 		"""Returns True if atleast one row exists."""
diff --git a/frappe/database/schema.py b/frappe/database/schema.py
index 28e055f382..83c22090eb 100644
--- a/frappe/database/schema.py
+++ b/frappe/database/schema.py
@@ -31,6 +31,7 @@ class DBTable:
 
 	def sync(self):
 		if self.is_new():
+			frappe.cache().delete_key('db_tables')
 			self.create()
 		else:
 			frappe.cache().hdel('table_columns', self.table_name)
@@ -137,16 +138,14 @@ class DBTable:
 						if frappe.db.is_missing_column(e):
 							# Unknown column 'column_name' in 'field list'
 							continue
-						else:
-							raise
+						raise
 
 					if max_length and max_length[0][0] and max_length[0][0] > new_length:
 						if col.fieldname in self.columns:
 							self.columns[col.fieldname].length = current_length
-
-						frappe.msgprint(_("""Reverting length to {0} for '{1}' in '{2}';
-							Setting the length as {3} will cause truncation of data.""")
-							.format(current_length, col.fieldname, self.doctype, new_length))
+						info_message = _("Reverting length to {0} for '{1}' in '{2}'. Setting the length as {3} will cause truncation of data.") \
+							.format(current_length, col.fieldname, self.doctype, new_length)
+						frappe.msgprint(info_message)
 
 	def is_new(self):
 		return self.table_name not in frappe.db.get_tables()