Changing custom and profile extension table schemas
When changing the structure/schema of a custom or Profile Extension table, keep in mind the following:
Important: If you delete a field, the values in that field are irrevocably deleted.
- You cannot change or reuse the name of an existing field.
- Permitted field name characters are A–Z a–z 0–9 . Names may include an _ (underscore).
- Using an index can improve the efficiency with which this table can be searched, but it requires more disk space for storing this table.