diff --git a/plugins/simdht/workers/simdht_worker.py b/plugins/simdht/workers/simdht_worker.py
index 1a89692ef..7e3a583cb 100755
--- a/plugins/simdht/workers/simdht_worker.py
+++ b/plugins/simdht/workers/simdht_worker.py
@@ -459,6 +459,8 @@ class DBCheck(Master):
 
         if db_size > db_size_limit:
             self.delete_db(DB_DEL_LINE)
+            self.query('OPTIMIZE TABLE  `search_hash`')
+            self.query('OPTIMIZE TABLE  `search_filelist`')
 
         print 'db size limit:', db_size_limit, db_size
         # self.delete_db(DB_DEL_LINE)