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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>

But also be aware that, in general, character set conversions are necessary. If clients are expecting data in a specific character set, it would be disastrous to send them the information in a different character set.

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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

999999 99999999 9999999999 999999999999 99999999999999 9999999999999999 999999999999999999 99999999999999999999 9999999999999999999999 999999999999999999999999 99999999999999999999999999 9999999999999999999999999999 14 rows selected.

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

Note I highly encourage everyone to read through the Oracle Globalization Support Guide document. It covers

Windows systems don t use the concept of processes, of course, but all user processes are threads of the same Oracle .exe process. In order to terminate an Oracle user s session on Windows, you can use the ORAKILL utility, which will kill a specific thread under the Oracle .exe process. Suppose you wish to kill a user s session. How do you find out what that user s thread is Listing 12-20 shows how you can use a simple query to identify any user s thread in a Windows system. Listing 12-20. Identifying a User s Thread in a Windows System SQL> SELECT sid, spid as thread, osuser, s.program 2 FROM v$process p, v$session s 3* WHERE p.addr = s.paddr; SID THREAD ----------- -----1 1192 2 1420 3 1524 4 1552 5 1528 6 1540 7 1580 8 1680 9 2948 10 4072 10 rows selected. SQL> OSUSER -----SYSTEM SYSTEM SYSTEM SYSTEM SYSTEM SYSTEM SYSTEM SYSTEM NETBSA\SAlapati NETBSA\SAlapati PROGRAM ------------ORACLE.EXE ORACLE.EXE ORACLE.EXE ORACLE.EXE ORACLE.EXE ORACLE.EXE ORACLE.EXE ORACLE.EXE sqlplusw.exe sqlplusw.exe

1000000 100000000 10000000000 1000000000000 100000000000000 10000000000000000 1000000000000000000 100000000000000000000 10000000000000000000000 1000000000000000000000000 100000000000000000000000000 10000000000000000000000000000

The script in Listing 12-20 will give you the thread numbers associated with each Oracle user. Once you have the thread numbers, you can kill the user s session by using the following command. Here s an example, assuming that the thread number is 2948:

NLS-related issues to a depth we will not here. Anyone creating applications that will be used around the globe (or even across international boundaries) needs to master the information contained in that document.

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