When you need to delete more than one record at a time, create a bulk-deletion job. Bulk deletion happens in the background.
You can use the Bulk Deletion Wizard to manually create bulk-deletion jobs.
Microsoft Dynamics CRM creates bulk-deletion jobs automatically in the following cases:
In addition, Microsoft Dynamics CRM automatically generates bulk-deletion jobs for cleanup tasks, such as deleting completed system jobs.
View status, cancel, resume, postpone, or pause a bulk-deletion job