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You can see the various files within the database by looking in the alert log for the new database, alert_nicko.log, which you ll find in the $ORACLE_HOME/rdbms/log directory, since we didn t specify the BACKGROUND_DUMP_DIR directory in the init.ora file. In the following segment from the alert log file for the database, you can see how the various files necessary for the new database were created. First, Oracle creates the control files and places them in the location you specified for the DB_CREATE_ONLINE_LOG_DEST_n parameter. Sun Jul 3 17:44:51 2005 create database nicko default temporary tablespace temp Sun Jul 3 17:44:51 2005 WARNING: Default passwords for SYS and SYSTEM will be used. Please change the passwords. Created Oracle managed file /u01/app/oracle/oradata/NICKO/controlfile/o1_mf_150w . . . Sun Jul 3 17:46:37 2005 Completed: create database nicko default temporary tablespace MMNL started with pid=13, OS id=28939 Here s what the alert log shows regarding the creation of the control files: Created Oracle managed file /u01/app/oracle/oradata/NICKO/controlfile/o1_mf_150w h3r1_.ctl Created Oracle managed file /u04/app/oracle/oradata/NICKO/controlfile/o1_mf_150w h3xx_.ctl Next, the Oracle server creates the duplexed online redo log files. Oracle creates the minimum number of groups necessary and duplexes them by creating a set of online log files (two) in the locations specified by the DB_CREATE_ONLINE_LOG_DEST and the DB_RECOVERY_FILE_DEST parameters:

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Created Oracle h48m_.log Created Oracle hf07_.log Created Oracle honc_.log Created Oracle hwh0_.log

There is a little overhead, however, since all traffic has to be encrypted before being sent You must configure a few settings on the sshd server and the ssh client to implement X protocol tunneling The option for X11Forwarding in the sshd_config file should be set to yes Then the sshd process should be restarted to enable the new configuration There is also an option on the ssh client side to enable X forwarding or tunneling To enable it from the command line, you add -X (when using OpenSSH) to the ssh command However, on Linux and Solaris systems X forwarding is enabled without using the switch; the Cygwin ssh client requires the -X switch There are many ssh clients, each of which has a number of settings to enable X forwarding.

managed file /u01/app/oracle/oradata/NICKO/onlinelog/o1_mf_1_150w managed file /u04/app/oracle/oradata/NICKO/onlinelog/o1_mf_1_150w managed file /u01/app/oracle/oradata/NICKO/onlinelog/o1_mf_2_150w managed file /u04/app/oracle/oradata/NICKO/onlinelog/o1_mf_2_150w

The System tablespace is created next, in the location you specified for the DB_CREATE_FILE_ DEST parameter: create tablespace SYSTEM datafile /* OMF datafile */ default storage (initial 10K next 10K) EXTENT MANAGEMENT DICTIONARY online Created Oracle managed file /u01/app/oracle/oradata/NICKO/datafile/o1_mf_system_ 150wj4c3_.dbf Completed: create tablespace SYSTEM datafile /* OMF datafile The default Sysaux tablespace is created next, as seen here: create tablespace SYSAUX datafile /* OMF datafile */ EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO online Sun Jul 3 17:46:16 2005 Created Oracle managed file /u01/app/oracle/oradata/NICKO/datafile/o1_mf_sysaux_ 150wkk9n_.dbf Completed: create tablespace SYSAUX datafile /* OMF datafile The undo tablespace is created next, with the default name of SYS_UNDOTS in the location specified by the DB_CREATE_FILE_DEST parameter. A temporary tablespace named TEMP is also created in the same directory: CREATE UNDO TABLESPACE SYS_UNDOTS DATAFILE SIZE 10M AUTOEXTEND ON Created Oracle managed file /test01/app/oracle/oradata/ora_omf/finDATA/ora_sys_undo_yj5mg123.dbf ... Successfully onlined Undo Tablespace 1. Completed: CREATE UNDO TABLESPACE SYS_UNDOTS DATAFILE SIZE 1 CREATE TEMPORARY TABLESPACE TEMP TEMPFILE Created Oracle managed file /test01/app/oracle/oradata/ora_omf/finDATA/ora_temp_yj5mg592.tmp Completed: CREATE TEMPORARY TABLESPACE TEMP TEMPFILE

Adding other tablespaces and data files within an OMF file system is easy. All you have to do is invoke the CREATE TABLESPACE command without the DATAFILE keyword. Oracle will automatically create the data files for the tablespace in the location specified in the DB_CREATE_FILE_DEST parameter. The example that follows shows how to create the tablespace: SQL> ALTER SYSTEM SET DB_CREATE_FILE_DEST = 2 '/test01/app/oracle/ora_omf/finance1'; System altered. SQL> CREATE TABLESPACE omftest; Tablespace created. SQL> SELECT file_name FROM dba_data_files 2 WHERE tablespace_name='OMFTEST'; FILE_NAME ----------------------------------------------------------/test01/app/oracle/oradata/ora_omf/ora_omftest_yj7590bm.dbf

Compare the OMF tablespace-creation statement shown previously with the typical tablespace-creation statement, and you ll see how OMF simplifies database administration. Adding data files is also simple with OMF, as shown by the following example: SQL> ALTER TABLESPACE omftest ADD DATAFILE; OMF files, as you can see, simplify file administration chores and let you create and manage databases with a small number of initialization parameters. You can easily set up the necessary number of locations for your online redo log files, control files, and archive log files by specifying the appropriate value for the various OMF parameters. Oracle s ASM-based file system relies on the OMF file system.

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