Which better please helop me?

Question

i have a project which include nany module which better
1- i make a hole schema for all peoject but it will be so diffcult
or
2- mack stand alone module database schema i user belong to it and macking synonyms for all table and give approviate privillage

Answer 1

We usually create one schema that holds all of the tables, stored procedures, etc. for an application. Then we create one or more roles as determined by the security needs of the application and grant appropriate privileges to the roles. Finally we create one or more schemas for the users. These have almost no access to create objects in the database. We grant the roles to the user schemas as needed.
As for synonyms, it has been our practice in the past to create public synonyms for everything.
We are starting to change this practice, and instead do one of two things. Our newest applications use only one (or just a few) user schema shared by all users. Individual user identities are maintained outside the database. Here, it is just as easy to create private synonyms in the one user schema as to create public synonyms.
When we still have one user schema per user, we may start all user sessions with an "ALTER SESSION SET CURRENT_SCHEMA" to set the current default schema to the application schema. That way no synonyms are needed.
Sometimes we do not make the application roles as default roles. Instead we password protect the roles and activate them when needed.