Can't ex[prt all data

Can't ex[prt all data

I cannot EXPORT data from a database that has in excess of 30,000 records, yet I can in one that only has a few hundred.  If there is a size limitation, how do I break apart the large database ?  Is this the problem ?  I have tried using both Firefox and IE 9, and get the same results each time, only the column headings and one record will be in the XLS backup.