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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. 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>

Although you can change the init.ora text file to your heart s content, don t try modifying the SPFILE directly. You ll end up corrupting it, and your instance may fail to start the next time you try to use the SPFILE!

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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 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:

Creating the SPFILE from the init.ora file doesn t mean that you can t use the init.ora file anymore. If you need to start the instance with the original init.ora file, you can do so as before by specifying it explicitly: SQL> STARTUP PFILE='/u01/app/oracle/product/10.1.0.2.0/dbs/initnina.ora'; However, you can t specify the SPFILE instead of the PFILE in the preceding example Oracle won t allow you to specify the SPFILE directly in a STARTUP command. However, you can do so indirectly by using a PFILE (init.ora) file that includes just one initialization parameter: the SPFILE parameter: spfile = ' /u01/app/oracle/product/10.1.0.2.0/dbs/spfilenina.ora After creating this new init.ora file, you can specify the PFILE variable in the STARTUP command, as shown earlier. Listing 10-8 shows the contents of the SPFILE (called SPFILEnina.ora) that was created from the initnina.ora file. Listing 10-8. A Sample SPFILE *.compatible='11.1.0.6' *.control_files='/u01/app/oracle/oradata/nina/control1.ctl', '/u01/app/oracle/oradata/nina/control2.ctl *.cursor_sharing='force' *.db_block_size=8192 *.db_domain='world' *.db_file_multiblock_read_count=16 *.db_files=1000 * db_flashback_retention_target=720 *.db_name='nina' *.db_recovery_file_dest='/u02/app/oracle/flash_recov_area' *.db_recovery_file_dest_size=1000M * instance_type='RDBMS' *.log_archive_dest_1='LOCATION=/u02/app/oracle/arch/'

$ 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 SID SERIAL# ----------------------------------2920:2836 10 34 SQL> 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 11-20 shows how you can use a simple query to identify any user s thread in a Windows system Listing 11-20.

*.log_archive_format='log%t_%s_%r.arc' *.pga_aggregate_target=1000M *.processes=600 *.remote_login_passwordfile='none' *.resumable_timeout=1800 *.sga_target=300M *.statistics_level='typical' *.undo_management='auto' *.undo_retention=7200 *.undo_tablespace='undotbs_01' *.

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