[J2EE]How to optimise the performance of content management system?

[joannakomodo]

There is a information management system which use J2EE to bulid. And the key in the system is information(reference to info_table in database), most of the operation(read and write) are on the table and use the InforAction(in tomcat reference to java code).Can you give some advice to improve the performence of the system?(such as database optimise or code writing)Thanks!