Description of the illustration pfgrf188.gif
This illustration depicts the archiver reading two log groups: one with log files 1a and 3a, and the other with log files 1b and 3b. The archiver is also writing to the archive destination.
The LGWR is writing to two log groups: one with log files 2a and 4a, and the other with log files 2b and 4b.
End of image description.