如何处理宽平台的列增长

How would you DBA's handle this? I have taken ownership of an existing app (VB6) and database that was written in 1999. The database design is fairly 'flat', meaning the main tables are fairly wide (100+ columns) and developers have continued to tack on additional columns to the end of the tables. This has resulted in columns that have a lot of Nulls since they don't directly relate to the primary key.How would you DBA's handle this? I have taken o