Read only users and row locks

Can read-only users get the line on non-temporary locks (i.e,. visible to other users) tables, for example through the SELECT updates, even if they couldn't change not ultimately of such tables?

Yes.

Here is an example with Oracle XE 11 G and a HR schema:

Connect as a user with only CREATE SESSION and right to SELECT on the table HR.JOBS:

SQL> desc hr.jobs;
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 JOB_ID                                    NOT NULL VARCHAR2(10)
 JOB_TITLE                                 NOT NULL VARCHAR2(35)
 MIN_SALARY                                         NUMBER(6)
 MAX_SALARY                                         NUMBER(6)

SQL> select * from session_roles;

no rows selected

SQL> select * from session_privs;

PRIVILEGE
----------------------------------------
CREATE SESSION

SQL> select owner, table_name, privilege from user_tab_privs;

OWNER                          TABLE_NAME
------------------------------ ------------------------------
PRIVILEGE
----------------------------------------
HR                             JOBS
SELECT

SQL> select job_title from hr.jobs for update;

JOB_TITLE
-----------------------------------
President
Administration Vice President
Administration Assistant
Finance Manager
Accountant
Accounting Manager
Public Accountant
Sales Manager
Sales Representative
Purchasing Manager
Purchasing Clerk

JOB_TITLE
-----------------------------------
Stock Manager
Stock Clerk
Shipping Clerk
Programmer
Marketing Manager
Marketing Representative
Human Resources Representative
Public Relations Representative

19 rows selected.

SQL>

Now the connection as HR after statement hangs:

SQL> connect hr/hr
Connected.
SQL> select * from jobs for update;

Going back to the first session:

SQL> update hr.jobs set min_salary=0;
update hr.jobs set min_salary=0
          *
ERROR at line 1:
ORA-01031: insufficient privileges

Tags: Database

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