# Bulk operations

You can perform the following bulk operations on one or more data marts:

* Drop and recreate tables
* Enable/Disable the Optimize for initial load option
* Generate the data mart task

To perform bulk operations

1. Click the Bulk Operations toolbar button in the Manage Data Marts widow. The Bulk Operations window opens.

   ![Example data displayed in the Bulk Operations window](https://help.qlik.com/en-US/compose/December2024/Content/Resources/Images/ComposeForDataWarehouses/bul_operations_dm.png)

2. Select which operations to perform and on which data marts to perform them.

3. Click OK. The Preparing All Data Marts window opens, displaying the progress of the selected operations.

4. When the `<n> data marts were prepared successfully message` is displayed, click Close.