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You can use the query shown in Listing 12-19, 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 12-19. Finding Out the SQL Being Executed by a User SQL> 2 3 4 5 6 7* 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; USERNAME -------HR SQL_TEXT ----------------------------------BEGIN dbms_stats.gather_table_stats ('HR','REGIONS'); END;

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. You can get the encrypted password for all users from the USER$ view. Here s an example: SQL> SELECT 'alter user tester identified by values '||password||';' 2 FROM user$ 3* WHERE username='TESTER'; 'ALTERUSERTESTERIDENTIFIEDBYVALUES'||';' --------------------------------------------------------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>

C3 C +Encrypt() +Decrypt()

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 to be killed and kills the session once the operation completes. 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: $ kill 345678 or $ kill -9 345678 You can use the following script to derive the process number from the V$SESSION dynamic view (and the SID and serial number as well): SQL> SELECT process, sid, serial# FROM v$session WHERE username='&user'; Enter value for user: SALAPATI old 2: username='&user' new 2: username='SALAPATI' PROCESS --------2920:2836 SQL> SID ---10 SERIAL# ------34