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Oracle lets you use the traditional init.ora file (or PFILE) as the configuration file. However, Oracle also recommends that you create and use an SPFILE for all databases. You can create the SPFILE from the init.ora file, and the process is very simple. You must first log in as a user with SYSDBA or SYSOPER privileges. Then run the following command, in which PFILE is the init.ora file for our new nina database (initnina.ora): SQL> CREATE spfile FROM pfile = '/u03/app/oracle/dbs/initnina.ora'; File created. SQL>

ot unlike the physical theories with their supporting time-dependent equations, communications between networking devices rely on time as well Throughout this and subsequent chapters, the classical physics view of time is assumed The reader is referred to 1 for additional perspectives on the concept of time, which permeates the operations of numerous networking protocols, not just NTP Various timers and time interval parameters (update, invalid, holddown, flush, hello, dead, wait, retransmit, keepalive, and more) exist within routing and other protocols such as ICMP RIP IRGP OSPF, and BGP Network administrators need to be familiar with the , , , actions of these time-related parameters and configure them judiciously Those parameters are almost without exception absolutely integral to the proper functioning of the protocols Inexperienced tinkering with protocol timers can lead to disasters on the order of bringing down entire networks.

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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>

Once you create the SPFILE, a subsequent request to create it from the init.ora file will overwrite the existing SPFILE.

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>

The previous command will create the SPFILE in the default location ($ORACLE_HOME/dbs). The file will be named spfilenina.ora. You can also create an SPFILE by giving it an explicit name, as shown in the following example: SQL> CREATE spfile = '/u03/app/oracle/dbs/nina_spfile.ora' FROM pfile = '/u03/app/oracle/dbs/initnina.ora'; If you want Oracle to create an SPFILE from your init.ora file, and both files are located in their default locations ($ORACLE_HOME/dbs), you can simply issue the following command: SQL> CREATE spfile FROM pfile; File created. SQL>

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*

You can also create a new init.ora file from the SPFILE in the default location by using the following command: SQL> CREATE pfile FROM spfile; File created. SQL> If you bounce the database now, the instance will start up using your new SPFILE. Oracle will look for the initialization parameter lists in their default locations in the following order, and it will use the first one it finds: 1. It looks for the spfile$ORACLE_SID.ora file in the default location. 2. It looks for a file called spfile.ora in the default location. 3. It looks for the traditional init.ora file, with the name init$ORACLE_SID.ora, in the default location.

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