Determining the size of a database

Hello, everyone, I have recently inherited a system where a number of different databases were all created on one dbspace. I would like to, at least initially, allocate one dbspace per database. I would like to make the dbspace roughly the size of the database, if possible. Does anyone have any suggestions as to how I could easily determine the actual size of a database's data and indexes? I would greatly appreciate any input. I am running Dynamic Server 7.23 in Sun solaris 2.4