I probably wouldn't add datafiles. Just extend or resize the datafile. Depending on your specific setup you might look at turning on autoextend.
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Why doesn't the Oracle optimizer use my index?
Querying too much data
Most Oracle developers know that an index is useful when you can use it to restrict your result set to a small number of the total rows in a table.
So, the obvious side…
Configuring and using Oracle Database Gateway for ODBC
First, a brief summary of what a Database Gateway is. A Gateway is a set of driver agents and configurations that allow an Oracle database to communicate with other platforms…
This video shows how to copy a database user from one database to another user DBMS_METADATA. It also shows how to copy a user's permissions and discusses password hash differences between Oracle 10g and 11g.