Hi Sergio,

>Changed one large column (240 chars) from Character to Varchar and size on disc actually increased ???

Yes. Varchars work similar to fields that support NULL values. There's an invisible field in the table call _NullFlags. Varchar fields need one bit in this field. The bit indicates if the value has the maximum size or not. When the bit is set, the first byte in the varchar field on disk indicates the length. Hence the table grows if you haven't had a nullable or varchar field, or remains the same if there's a free bit in the field.