Oracle9i: Monitoring transactions Question

Fellow Oracle Netters:

I need to know what sort of queries and transactions are being done in an Oracle9i database server which I am the DBA.

I would like to see the actual sql commands performed by the connected users in order to optimize the performance of this database.

Now, I have two partial ways of doing it and seeing part of the commands:

1. run the query: SELECT SQL_TEXT FROM V$SQLTEXT and
2. run some of the tools in the OEM console like "top sessions"

Now the question is:

Is there a better way of doing this?

Thanks in advance,

1. Fuentes 512-297-9937