diff --git a/bucket.go b/kv.go
similarity index 100%
rename from bucket.go
rename to kv.go
diff --git a/pkg/etcd/etcd.go b/pkg/etcd/etcd.go
index 69a4c76..5c746e6 100644
--- a/pkg/etcd/etcd.go
+++ b/pkg/etcd/etcd.go
@@ -37,6 +37,7 @@ func New(dbName string, opts ...opt) (*Etcd, error) {
 		nutsdb.WithDir(dbName),
 		nutsdb.WithEntryIdxMode(nutsdb.HintKeyAndRAMIdxMode),
 		nutsdb.WithSyncEnable(opt.sync),
+		nutsdb.WithHintKeyAndRAMIdxCacheSize(0),
 	)
 	if err != nil {
 		return &Etcd{}, err