diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..6965884
Binary files /dev/null and b/.DS_Store differ
diff --git a/files.go b/files.go
index 5407a0b..4c0adee 100755
--- a/files.go
+++ b/files.go
@@ -59,7 +59,11 @@ func (b *Files) Set(key string, value []byte, ns ...string) error {
 	namespace := resolveNamespace(ns)
 	dir := path.Join(b.root, namespace)
 	if value == nil {
-		return os.Remove(path.Join(dir, key))
+		err := os.Remove(path.Join(dir, key))
+		if os.IsNotExist(err) {
+			err = nil
+		}
+		return err
 	}
 	if err := os.MkdirAll(dir, os.ModePerm); err != nil {
 		return err
diff --git a/leveldb.go b/leveldb.go
index 8a59987..bb6843a 100755
--- a/leveldb.go
+++ b/leveldb.go
@@ -18,15 +18,18 @@ type LevelDB struct {
 
 func NewLevelDB(path string) (*LevelDB, error) {
 	db, err := leveldb.OpenFile(path, &opt.Options{
-		Filter: filter.NewBloomFilter(32),
+		Filter:                 filter.NewBloomFilter(32),
+		OpenFilesCacheCapacity: 25,
 	})
 	if err != nil {
 		db, err = leveldb.RecoverFile(path, &opt.Options{
-			Filter: filter.NewBloomFilter(32),
+			Filter:                 filter.NewBloomFilter(32),
+			OpenFilesCacheCapacity: 25,
 		})
 		if err == nil && db.Close() == nil {
 			db, err = leveldb.OpenFile(path, &opt.Options{
-				Filter: filter.NewBloomFilter(32),
+				Filter:                 filter.NewBloomFilter(32),
+				OpenFilesCacheCapacity: 25,
 			})
 		}
 	}