To recover a database, you use the following files as input information for the database recovery utility (pdrstr).

• Backup files
• Unload log files

Figure 7-1 provides an overview of the database recovery process.

Figure 7-1 Overview of database recovery process

^* An unload log file is created by unloading system log files (system log information) that contain information comprising a history of the updates to the database.

Explanation

• Backups are made by the database copy utility (pdcopy).
• The pdlogunld command creates an unload log file.
• Using the backup and unload log files as the input, the database recovery utility (pdrstr) recovers the database.

For details about making backup files and of creating unload log files, see Section 7.2 Preparations for database errors.