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Different Types of Oracle Managed Files
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You can use OMF to create all three types of files that the Oracle database requires: control files, redo log files, and, of course, data files. However, there are interesting differences in the way OMF requires you to specify (or not specify) each of these types of files. The following sections cover how Oracle creates the three different types of files.
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As you have probably noticed already, there is no specific parameter that you need to include in your init.ora file to specify the OMF format. If you specify the control files parameter, you will, of course, have to specify a complete file location for those files, and obviously they will not be OMF files they are managed by you. If you don t specify the control files parameter, and you use the DB_CREATE_FILE_DEST or the DB_CREATE_ONLINE_LOG_DEST_n parameter, your control files will be OMF files. If you are using a traditional init.ora file, you need to add the control file locations to it. If you are using an SPFILE, Oracle automatically adds the control file information to it.
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OMF redo log file creation is similar to control file creation. If you don t specify a location for the redo log files, and you set either the DB_CREATE_FILE_DEST or the DB_CREATE_ONLINE_LOG_DEST_n parameter in the init.ora file, Oracle automatically creates OMF-based redo log files.
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CHAPTER 17 AUTOMATIC MANAGEMENT AND ONLINE CAPABILITIES
Data Files
If you don t specify a data file location in the CREATE or ALTER statements for a regular data file, or a temp file for a temporary tablespace, temp file, or an undo tablespace data file, but instead specify the DB_CREATE_FILE_DEST parameter, all these files will be OMF files.
Simple Database Creation Using OMF
Let s look at a small example to see how OMF files can really simplify database creation. When you create a new database, you need to provide the control file, redo log file, and data file locations to Oracle. You specify some file locations in the initialization file (control file locations) and some file locations at database creation (such as redo log locations). However, if you use OMF-based files, database creation can be a snap, as you ll see in the sections that follow.
Setting Up File Location Parameters
For the new OMF-based database, named NICKO, let s use the following initialization parameters. db_name=nicko DB_CREATE_FILE_DEST = '/u01/app/oracle/oradata' DB_RECOVERY_FILE_DEST_SIZE = 100M DB_RECOVERY_FILE_DEST = '/u04/app/oracle/oradata' LOG_ARCHIVE_DEST_1 = 'LOCATION = USE_DB_RECOVERY_FILE_DEST' Note that of the four OMF-related initialization parameters, I chose to use only the DB_CREATE_ FILE_DEST, DB_RECOVERY_FILE_DEST_SIZE, and DB_RECOVERY_FILE_DEST parameters. I didn t have to use the fourth parameter, DB_CREATE_ONLINE_LOG_DEST_n, in this example. When this parameter is left out, Oracle creates a copy of the log file and the redo log file in the locations specified for the DB_CREATE_FILE_DEST and the DB_RECOVERY_FILE_DEST parameters. I thus have two copies of the control file and the online redo log files. The setting for the last parameter, LOG_ARCHIVE_DEST_1, tells Oracle to send the archived redo logs for storage in the flash recovery area specified by the DB_RECOVERY_FILE_DEST parameter.
Starting the Instance
Using the simple init.ora file in the preceding section, you can start an instance as shown in Listing 17-10: Listing 17-10. Creating the OMF-Based Instance $ export ORACLE_SID=nicko [nicko] $ sqlplus /nolog SQL*Plus: Release 10.2.0.0 - Beta on Sun July 3 17:21:58 2005 Copyright (c) 1982, 2004, Oracle. All rights reserved. SQL> connect sys/sys_passwd as sysdba Connected to an idle instance. SQL> STARTUP NOMOUNT PFILE='initnicko.ora'; ORACLE instance started. Total System Global Area 188743680 bytes Fixed Size 1308048 bytes Variable Size 116132464 bytes Database Buffers 67108864 bytes Redo Buffers 4194304 bytes SQL>
CHAPTER 17 AUTOMATIC MANAGEMENT AND ONLINE CAPABILITIES
Creating the Database
Now that you ve successfully created the new Oracle instance, you can create the new database NICKO with this simple command: SQL> CREATE DATABASE nicko; Database created. SQL> That s it! Just those two simple lines are all you need to create a functional database with the following structures: A System tablespace created in the default file system specified by the DB_CREATE_FILE_DEST parameter (/u01/app/oracle/oradata) A Sysaux tablespace created in the default file system (/u01/app/oracle/oradata) Two duplexed redo log groups Two copies of the control file A default temporary tablespace An undo tablespace automatically managed by the Oracle database
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