Reg Role

Hi,
User U1 has default privileges assigned to him through a role R1. There is a table named T1. U1 is able to access T1 through Sql plus and not through Pl/sql.
Can anyone tell me what is the privilege he is missing?
Thanks

First of all SQL Plus is different and SQL is different. SQL Plus is editor provided by oracle to test/execute simple queries. SQL is the actual query language.
Actually my previous statement is only partially correct.
Subprograms are classified into Anonymous Blocks and Named Subprograms.
Anonymous blocks means PL/SQL script with no name associated with it. They will not be stored in database. They will get compiled and executed every time you run it.
Named subprograms means packages, procedures and functions. Generally we will have logic implemented in procedures and functions.
Again these procedures and functions are classified into invoker right subprograms and definer right subprogram. There is a clause called AUTHID in procedure/function spec.
By default or if AUTHID is not specified it is definer rights which means that when procedure is invoked it will be executed with the privileges of the user/schema who created that procedure.
Eg: For suppose there are 2 schemas A and B
We create procedure by name proc in A with definer rights. Let us assume that table Table1 is used in A on which A has all the privileges. Once procedure is created in A and execute grants are given to B, B can invoke the procedure any time.
Schema A
proc1
delete from table1;
end;
grant on proc1 to B
Now when B invoke the procedure even though B didnt have any privileges the data is deleted.
Keep in mind that this is default behavior of stored proc.
Invoker rights means we need to specify AUTHID current_user in proc/func spec.
In this case the procedure will fail as B didnt have privileges on table1.
Now come to the point, privileges granted over role will work in anonymous blocks and invoker right subprograms. But in case of definer rights it wont work.
The reason for this (1 example):
For suppose A is SYSDBA (DBA is a role) which will have lots of Predefined Package developed in SYSDBA which will play around actual tables.
For suppose there is a procedure proc1 which will truncate aud$ (important base table)
Now every one who got execute privileges can the procedure and truncate aud$.
If in this case only direct privileges work, then it will never happen.
If B has to do that specific operation related to aud$ we can directly grant to that. All the other users/schemas who try to invoke will fail.
I hope you understand what I mean.
You can refer
http://download-east.oracle.com/docs/cd/B10501_01/appdev.920/a96624/08_subs.htm#18575

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