diff --git a/dist/contracts/IOperation.d.ts b/dist/contracts/IOperation.d.ts
index f42c4db..d737956 100644
--- a/dist/contracts/IOperation.d.ts
+++ b/dist/contracts/IOperation.d.ts
@@ -6,6 +6,11 @@ export default interface IOperation {
      * Fetch schema and a portion of data
      */
     fetch(orientation?: FetchOrientation): Promise<Status>;
+    /**
+     * Resets `this.data` buffer.
+     * Needs to be called when working with massive data.
+     */
+    flush(): void;
     /**
      * Request status of operation
      *
diff --git a/lib/contracts/IOperation.ts b/lib/contracts/IOperation.ts
index 9d2d7bc..723d5d1 100644
--- a/lib/contracts/IOperation.ts
+++ b/lib/contracts/IOperation.ts
@@ -8,6 +8,12 @@ export default interface IOperation {
      */
     fetch(orientation?: FetchOrientation): Promise<Status>;
 
+    /**
+     * Resets `this.data` buffer.
+     * Needs to be called when working with massive data.
+     */
+    flush(): void;
+
     /**
      * Request status of operation
      *