diff --git a/labml_db/index.py b/labml_db/index.py
index c5f49a9..068cbf1 100644
--- a/labml_db/index.py
+++ b/labml_db/index.py
@@ -7,11 +7,12 @@
 
 
 class Index(Generic[_KT]):
-    __db_drivers: Dict[str, IndexDbDriver]
+    __db_drivers: Dict[str, IndexDbDriver] = {}
 
     @staticmethod
     def set_db_drivers(db_drivers: List[IndexDbDriver]):
-        Index.__db_drivers = {d.index_name: d for d in db_drivers}
+        for d in db_drivers:
+            Index.__db_drivers[d.index_name] = d
 
     @classmethod
     def delete(cls, index_key: str):
@@ -41,3 +42,9 @@ def mget(cls, index_key: List[str]) -> List[Optional[Key[_KT]]]:
     def set(cls, index_key: str, model_key: Key[_KT]):
         db_driver = Index.__db_drivers[cls.__name__]
         db_driver.set(index_key, str(model_key))
+
+    @classmethod
+    def get_all(cls):
+        db_driver = Index.__db_drivers[cls.__name__]
+        keys = db_driver.get_all()
+        return keys
diff --git a/labml_db/index_driver/__init__.py b/labml_db/index_driver/__init__.py
index 78b31eb..d9f1585 100644
--- a/labml_db/index_driver/__init__.py
+++ b/labml_db/index_driver/__init__.py
@@ -19,3 +19,6 @@ def mget(self, index_key: List[str]) -> List[str]:
 
     def set(self, index_key: str, model_key: str):
         raise NotImplementedError
+
+    def get_all(self) -> List[str]:
+        raise NotImplementedError
diff --git a/labml_db/index_driver/redis.py b/labml_db/index_driver/redis.py
index e16a8bc..5213565 100644
--- a/labml_db/index_driver/redis.py
+++ b/labml_db/index_driver/redis.py
@@ -27,6 +27,8 @@ def get(self, index_key: str) -> str:
     def mget(self, index_key: List[str]) -> List[str]:
         return self._db.hmget(self._index_key, index_key)
 
-
     def set(self, index_key: str, model_key: str):
         self._db.hset(self._index_key, index_key, model_key)
+
+    def get_all(self):
+        return self._db.hgetall(self._index_key)
diff --git a/labml_db/model.py b/labml_db/model.py
index f67ddc9..3e0364e 100644
--- a/labml_db/model.py
+++ b/labml_db/model.py
@@ -168,7 +168,7 @@ def defaults(self) -> Dict[str, Primitive]:
 
 class Model(Generic[_KT]):
     __models: Dict[str, ModelSpec] = {}
-    __db_drivers: Dict[str, 'DbDriver']
+    __db_drivers: Dict[str, 'DbDriver'] = {}
     _defaults = Dict[str, Primitive]
     _values = Dict[str, Primitive]
 
@@ -239,7 +239,8 @@ def key(self) -> 'Key[_KT]':
 
     @staticmethod
     def set_db_drivers(db_drivers: List['DbDriver']):
-        Model.__db_drivers = {d.model_name: d for d in db_drivers}
+        for d in db_drivers:
+            Model.__db_drivers[d.model_name] = d
 
     @classmethod
     def mread_dict(cls, key: List[str], db_driver: Optional['DbDriver'] = None) -> List[ModelDict]: