how to print barcode in crystal report using vb net Disabling Roles in Font

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All application roles should use the SET ROLE statement to enable the roles granted to users. Application users should be granted roles only for specific purposes, and the roles should be revoked from them when they aren t needed any longer. Application owners should consider creating secure application roles, which are enabled by PL/SQL packages. Once you create and assign a secure application role to a user, it automatically gets assigned to the user when the user logs in to the database.
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Restricting SQL*Plus Usage
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One of the first things you should do when opening your database to the public is to tightly restrict the ability of users to use the SQL*Plus interface. You can restrict the SQL*Plus capabilities of a user by using the product_user_profile table.
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CHAPTER 11 USER MANAGEMENT AND DATABASE SECURITY
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Useful Techniques for Managing Users
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In this section you ll examine some simple scripts that can help you manage your users. You ll also learn about some typical problems that you might encounter in this area.
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Altering Profiles
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The following code shows how to alter a user s profile: SQL> ALTER PROFILE fin_user 2 LIMIT 3 FAILED_LOGIN_ATTEMPTS 5 4 PASSWORD_LOCK_TIME 1; Profile altered. SQL>
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You can use the DBA_USERS view to get quite a bit of information about the user population in your database. Here s a typical query using the DBA_USERS view: SQL> SELECT username, profile, account, status FROM dba_users; USERNAME PROFILE ACCOUNT_STATUS --------------------------------------------------------------SYS DEFAULT OPEN SYSTEM DEFAULT OPEN OUTLN DEFAULT OPEN DBSNMP DEFAULT OPEN HARTSTEIN DEFAULT OPEN FINANCE DEFAULT OPEN SQL>
Determining What SQL a User Is Currently Executing
You can use the query shown in Listing 11-19, which joins the V$SESSION and the V$SQLTEXT tables, to give you the text of the SQL currently being used by a user. Listing 11-19. Finding Out the SQL Being Executed by a User SELECT a.sid,a.username, s.sql_text FROM v$session a,v$sqltext s WHERE a.sql_address = s.address AND a.sql_hash_value = s.hash_value AND a.username LIKE 'HR%' ORDER BY a.username,a.sid,s.piece; SID USERNAME SQL_TEXT ---------------------------------------------------------------8 HR BEGIN dbms_stats.gather_table_stats ('HR','REGIONS'); END; SQL> SQL> 2 3 4 5 6 7*
CHAPTER 11 USER MANAGEMENT AND DATABASE SECURITY
Logging In As a Different User
You may need to sometimes log in as another DBA to perform certain actions. However, even the Oracle DBA doesn t have access to users passwords, which are stored in an encrypted form. You could use the ALTER USER statement to change the user s password, but you might not want to inconvenience the user by changing the password for good. In a case like this, you can change the password of a user temporarily and use the new password to get in as that user. Before you change a user s password, get the original encrypted password, which you can use to reset the user s password back after you re done. Here s an example: SQL> SELECT 'alter user tester identified by values '||password||';' 2 FROM dba_users 3* WHERE username='TESTER'; 'ALTERUSERTESTERIDENTIFIED --------------------------------------------------------alter user tester identified by values 1825ACAA229030F1; SQL> Now change the password of user tester so you can log in as that user: SQL> ALTER USER tester IDENTIFIED BY newpassword; When you re done using the tester user account, use the ALTER USER statement again to change user tester s password back to its original value. Make sure you enclose the encrypted password in single quotes. SQL> ALTER USER tester IDENTIFIED BY VALUES '1825ACAA229030F1'; User altered. SQL>
Killing a User s Session
You can use the ALTER SYSTEM command to kill any user s session. You need to first query the V$SESSION view for the values of the SID and serial number of the user. Then using the SID and serial number, you can kill the user s session. Here s an example: SQL> SELECT sid, serial# FROM v$session 2* WHERE username='SALAPATI'; SID SERIAL# ---------------10 32 SQL> ALTER SYSTEM KILL SESSION '10,32'; System altered. SQL> If the session you want to kill is involved in a long operation, such as a lengthy rollback, Oracle will inform you that the session is marked for kill and it will be killed after the operation is completed. When Oracle kills a session, it rolls back all ongoing transactions and releases all session locks. If the UNIX process of the user is killed, the Oracle session will most likely be killed also, but that isn t the most graceful way to end a session. If you think you must kill a user s UNIX session, and the Oracle KILL SESSION command isn t working, or it s taking a long time, you can terminate the session rather abruptly by using the UNIX kill command as follows. Note that you can use either the kill command by itself or with the -9 switch, but in most cases the simple kill command will be enough to terminate the UNIX session of your Oracle users:
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