The data records of a database, including their index entries, are called application data.
Application data is stored in the data area of the database, which consists of one or several data volumes. The database system may distribute application data from one table across several data volumes. You cannot influence or find out which application data is stored in which data volumes.
Concepts of the Database Systems, How Databases Store Data and Log Entries
Database Studio, Changing Data in the Database
SQLCLI, Executing SQL Statements
SQL Reference Manual, Data Manipulation