Starter Database Contents

Locating the Initialization Parameter File

The database initialization parameter file (init.ora) is generated when a database is created. The init.ora file is used to bring up the instance and to create the database and the data dictionary. When the database is complete, the instance is shutdown, and the init.ora file is saved to ora_root:[dbs]init<SID>.ora. The logical, ORA_PARAMS, points to ora_root:[dbs]init<SID>.ora.

The init.ora file is a text file that contains a list of preconfigured instance configuration parameters and that must exist for an instance to start. No edits are required to this file in order to use the starter database.

See Also: Oracle9i Database Administrator’s Guide and Oracle9i Database Reference for more information on database-specific initialization parameters and their default values.

Locating Redo Log Files

The starter database and the custom database each contain three redo log files that are located in the ora_root:[oradata.<db_name>] directory. Table 5–3describes the redo log files.

Table 5–3 Redo Log files

Redolog Files

Disk Size

Description

redo01.rdo

100 MB

redo02.rdo

100 MB

redo03.rdo

100 MB

Redo log files hold a record of all changes that are made to data in the database buffer cache. If an instance failure occurs, then Oracle9i uses the redo log files to recover the modified data in memory.

Oracle9i uses redo log files in a cyclical fashion. For example, if three files constitute the online redo log, then Oracle9i fills the first file, then fills the second file, and then fills the third file. In the next cycle, it reuses and fills the first file, the second file, and so on.

See Also: Oracle9i Backup and Recovery Concepts for more information on redo log files.

Post-Installation 5-25

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Oracle Audio Technologies B10508-01 Locating the Initialization Parameter File, Locating Redo Log Files, Redo Log files

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