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5 You issue these commands: A grant select on hrregions to jon; B grant all on hrregions to jon; C grant dba to jon; D grant select on hrregions to public; Which grants could be revoked to prevent JON from seeing the contents of HRREGIONS (Choose all correct answers) A a, b, c, and d B a, c, and d C b, c, and d D c and d E a, b, and c 6 Which of these statements about system privileges are correct (Choose all correct answers) A Only the SYS and SYSTEM users can grant system privileges B If a system privilege is revoked from a user, it will also be revoked from all users to whom he granted it C If a system privilege is revoked from a user, it will not be revoked from all users to whom she granted it D CREATE TABLE is a system privilege E CREATE ANY TABLE is a system privilege
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7 Study this script (line numbers have been added):
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1 2 3 4 create role hr_role identified by pass; grant create table to hr_role; grant select table to hr_role; grant connect to hr_role;
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Which line will cause an error (Choose the best answer) A Line 1, because only users, not roles, have passwords B Line 2, because only users, not roles, can create and own tables C Line 3, because SELECT TABLE is not a privilege D Line 4, because a role cannot have a system privilege in addition to table privileges
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8 Which of these statements is incorrect regarding roles (Choose the best answer) A You can grant object privileges and system privileges and roles to a role B A role cannot have the same name as a table C A role cannot have the same name as a user D Roles can be enabled or disabled within a session
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9 You have created a profile with LIMIT SESSIONS_PER_USER 1 and granted it to a user, but you find that he/she is still able to log on several times concurrently Why could this be (Choose the best answer) A The user has been granted CREATE SESSION more than once B The user has been granted the DBA role C The RESOURCE_LIMIT parameter has not been set D The RESOURCE_MANAGER_PLAN parameter has not been set 10 Which of these can be controlled by a password profile (Choose all correct answers) A Two or more users choosing the same password B Preventing the reuse of a password by the same user C Forcing a user to change password D Enabling or disabling password file authentication
LAB QUESTION
For this question, use Database Control where possible if you wish, but it is usually necessary to use SQL*Plus to query views directly when trying to understand what is happening with access rights There are often several ways of getting to a table, and it can be difficult to work out why a user can see it Create a user BERND, and give him the necessary permissions to log on to the database with password authentication and create tables in his own schema Test this by connecting as BERND and creating a table DATETAB, with a single column of type DATE Insert a row into DATETAB, and commit the insert Create a user CHRISTA Give her these privileges:
CREATE SESSION SELECT ON BERNDDATETAB ALL ON BERNDDATETAB
Lab Question
Connect as CHRISTA, and check that she can read BERNDDATETAB Revoke her SELECT privilege, and confirm that she can no longer select from BERNDDATETAB, though she can (perhaps oddly) insert rows into it Why is this, when she was also granted ALL on BERNDDATETAB Run queries against DBA_TAB_PRIVS at all stages to understand what is happening Create a user DORIS, and grant privileges as follows:
SELECT SELECT SELECT DBA to ON BERNDDATETAB to DORIS ON BERNDDATETAB to PUBLIC ANY TABLE to DORIS DORIS
Confirm that DORIS can now read BERNDDATETAB What privileges must be revoked before DORIS will no longer be able to see BERNDDATETAB Check the permissions at all stages by querying DBA_TAB_PRIVS, DBA_SYS_PRIVS, and DBA_ROLE_PRIVS Tidy up by dropping the users Remember to use CASCADE where appropriate
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