- Free !
- Simple to install.
- No need to install agents.
- No need to run a performance warehouse.
- No need to hire consultants to implement.
- No extra clients to install.
- No GUI.
- No direct memory access for fine grained monitoring.
- You need a query tool (like Toad), which can be used to copy+paste data to Excel.
- You need a graph tool like Excel.
- A little work has to be done to produce a graph.
- You still need indepth knowledge of the Oracle database.
- You still need a method for performanced tuning & analysus.
- Analysis of performance puts extra load on the database.