Space management lets you add or remove space from databases to make sure enough space is available to move objects.
When you move an object to a new map, the original object remains until a copy of the object is successfully created on the target AMPs. Temporarily, the database needs enough Perm space for two copies of the object.
Increasing the workers increases the number of objects that are moved at the same time. Make sure the available Perm space is enough to move the n largest objects in the database with n equal to the number of workers.