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CHAPTER 4 INTRODUCTION TO THE ORACLE DATABASE 10G ARCHITECTURE
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By default, Oracle will write over the contents of a redo log file, unless you choose to archive your redo files. Oracle recommends that you archive the filled-up redo log files, so you can maintain a complete record of all the changes made to the database since the last backup. If you archive your redo log files, you are said to be running your database in the archivelog mode. Otherwise, you re running in noarchivelog mode. Because of the critical importance of the redo log files in helping recover from database crashes, Oracle recommends multiplexing (maintaining multiple copies of) the redo log files. Multiplexing the online redo log files by placing two or more copies of the redo logs on different disk drives will ensure that you won t easily lose data changes that haven t been recorded in your data files.
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The SPFILE
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When you create a new database, you specify the initialization parameters for the Oracle instance in a special configuration file called the server parameter file (SPFILE). You can also use an older version of the configuration file called the init.ora file, but Oracle recommends the use of the more sophisticated SPFILE. In the SPFILE, you specify the memory limits for the instance, the locations of the control files, whether and where the archived logs are saved, and other settings that determine the behavior of the Oracle database server. You can t, however, edit the SPFILE manually, as you could the init.ora file, since the SPFILE is a binary file. The SPFILE is always stored on the database server, thus preventing the proliferation of parameter files that sometimes occurs with the use of the init.ora file. By default, the SPFILE (and the init.ora file) is placed in the ORACLE_HOME/dbs directory in UNIX systems and the ORACLE_HOME\database directory in Windows systems. The ORACLE_HOME directory is the standard location for the Oracle executables.
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You ll find a detailed discussion of the SPFILE, including how to create one from your init.ora file, in 9, where you will learn about creating Oracle databases.
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Oracle allows you to change a number of the initialization parameters after you start up the instance; these are called dynamic initialization parameters. Unlike the traditional init.ora initialization file, the SPFILE can automatically and dynamically record the new values of dynamic parameters after you change them, ensuring that you don t forget to incorporate the changes. The rest of the parameters can t be changed dynamically, and you ll have to restart your instance if you need to modify any of those parameters. You can use the V$SPPARAMETER data dictionary view to look at the initialization parameter values you have explicitly set in the SPFILE for your database. (The analogous view, if you are using the init.ora file, is the V$PARAMETER view.) In addition to the parameter values you set explicitly in the SPFILE, the V$SPPARAMETER view shows all the default values for all database configuration parameters (the values in effect in the instance right now). 9 has a more complete discussion of the SPFILE.
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Sometimes you ll see references to undocumented or hidden Oracle parameters. These parameters usually have an underscore (_) prefix. Don t use them unless you re requested to do so by Oracle support experts or other trustworthy sources.
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CHAPTER 4 INTRODUCTION TO THE ORACLE DATABASE 10G ARCHITECTURE
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The Password File
The password file is an optional file in which you can specify the names of database users who have been granted the special SYSDBA or SYSOPER administrative privileges, which enable them to perform privileged operations, such as starting, stopping, backing up, and recovering databases. 10 shows you how to create and maintain the password file.
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