diff --git a/wcs_olap/feeder.py b/wcs_olap/feeder.py
index aec0266..2b633c2 100644
--- a/wcs_olap/feeder.py
+++ b/wcs_olap/feeder.py
@@ -315,11 +315,21 @@ class WcsOlapFeeder(object):
     def do_schema(self):
         self.ex('SET search_path = public')
         self.logger.debug('dropping schema %s', self.schema + '_temp')
+        self.drop_tables_sequencially()
         self.ex('DROP SCHEMA IF EXISTS {schema_temp} CASCADE')
         self.logger.debug('creating schema %s', self.schema)
         self.ex('CREATE SCHEMA {schema_temp}')
         self.ex('SET search_path = {schema_temp},public')
 
+    def drop_tables_sequencially(self):
+        """
+        Drop tables one by one in order to avoid reaching max_locks_per_transaction
+        """
+        self.ex("SELECT tablename FROM pg_tables WHERE schemaname = '{schema_temp}'")
+        for table in self.cur.fetchall():
+            tablename = '%s%s.%s' % (self.schema, '_temp', table[0])
+            self.ex('DROP TABLE IF EXISTS %s CASCADE;' % tablename)
+
     def do_dates_table(self):
         # test if public.dates exists
         self.ex("SELECT * FROM information_schema.tables WHERE table_name = 'dates' AND"