Transactions per rollback segment is derived from

Which of the following is not an reason for the fact that most of the processing is done at the server ?

These following parameters are optional in init.ora parameter file DB_BLOCK_SIZE, PROCESSES

It is very difficult to grant and manage common privileges needed by different groups of database users using the roles 

ENQUEUE resources parameter information is derived from 

Which of the following does not affect the size of the SGA

Is it possible to use Transactional control statements in Database Triggers?

Is it possible to Enable or Disable a Database trigger ?

What are the different events in Triggers ?

SYSTEM.EFFECTIVE.DATE varaible is