diff --git a/internal/shardchain/dbfactory.go b/internal/shardchain/dbfactory.go
index fdc64b97d..bfc9ebe61 100644
--- a/internal/shardchain/dbfactory.go
+++ b/internal/shardchain/dbfactory.go
@@ -22,7 +22,7 @@ type LDBFactory struct {
 // NewChainDB returns a new LDB for the blockchain for given shard.
 func (f *LDBFactory) NewChainDB(shardID uint32) (ethdb.Database, error) {
 	dir := path.Join(f.RootDir, fmt.Sprintf("harmony_db_%d", shardID))
-	return ethdb.NewLDBDatabase(dir, 128, 1024)
+	return ethdb.NewLDBDatabase(dir, 128, 64)
 }
 
 // MemDBFactory is a memory-backed blockchain database factory.