When the DXgrid datastore is created, the size of it is fixed. When the datastore fills up, there is a way that you can extend it (increase it's size). The DXtool is called "dxextenddb".
When a DXgrid datastore reaches 100% full (or close to), you can increase the size of the datastore by using the DXtool called "dxextenddb". The process for extending a datastore is as follows:
Once the DXgrid datastore has been extended and restarted, you can continue adding or modifying entries.