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CHAPTER 11 USER MANAGEMENT AND DATABASE SECURITY
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$ 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. 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 OSUSER PROGRAM ------------------------------------------------------------1 1192 SYSTEM ORACLE.EXE 2 1420 SYSTEM ORACLE.EXE 3 1524 SYSTEM ORACLE.EXE 4 1552 SYSTEM ORACLE.EXE 5 1528 SYSTEM ORACLE.EXE 6 1540 SYSTEM ORACLE.EXE 7 1580 SYSTEM ORACLE.EXE 8 1680 SYSTEM ORACLE.EXE 9 2948 NETBSA\SAlapati sqlplusw.exe 10 4072 NETBSA\SAlapati sqlplusw.exe 10 rows selected. SQL> The script in Listing 11-20 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: C:> orakill 2948 This chapter covered a vast terrain, including creating users, granting privileges and roles, auditing the Oracle database, security mechanisms (including the virtual private database concept), authentication methods, and data encryption. For more details about Oracle s user management and security mechanisms please refer to the Oracle Database Security Guide manual.
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Using SQL*Plus and iSQL*Plus
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ou can connect to and work with Oracle databases in many ways. Chances are, though, that you ll spend a lot of time using the Oracle SQL*Plus interface and a set of commands known as SQL*Plus commands. The SQL*Plus interface provides you with a window into the Oracle database, and Oracle developers use the interface extensively to create SQL and PL/SQL program units. The interface is a valuable tool for Oracle DBAs for several reasons: You can use it to run SQL queries and PL/SQL (Oracle s procedural language extension to SQL) code blocks and to receive the results You can issue DBA commands and automate jobs It enables you to start up and shut down the database It provides you with a convenient way to create database administration reports
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This chapter covers the use of SQL*Plus to perform typical database administration tasks, and you ll get a chance to learn the important SQL*Plus commands, if you aren t already familiar with them. There is also a brief discussion of building reports using SQL*Plus. Although you probably won t use the SQL*Plus interface to produce a lot of reports, it s nice to know how to work with its many report-building features. The iSQL*Plus interface enables you to connect to the Oracle database through a web browser and use most of the standard SQL*Plus commands. This chapter outlines how to configure and use iSQL*Plus.
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The web-based iSQL*Plus interface is available only with the Oracle9i or Oracle Database 10g software and not as part of an Oracle Client installation. SQL*Plus is available with both the Oracle Database Server and Oracle Client installations.
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Starting a SQL*Plus Session
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SQL*Plus is the utility most commonly used to connect to and work with an Oracle database. SQL*Plus is included with your Oracle Database 10g server software, and the Oracle Client software also contains the SQL*Plus executables. You can also use the new Oracle Instant Client (discussed in 11), to connect to a database using SQL*Plus. The web-based interface, iSQL*Plus, is automatically installed with the server software as well. Once you ascertain that the SQL*Plus software is installed on your server or client machine, it s a straightforward process to log in to the server or client and start a SQL*Plus session. Since every SQL*Plus session involves a connection with a database (unless it s a NOLOG connection, as
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