Archiver Stuck
When an archiver stuck occurs, the database instance is not shut
down, but does not allow any changes. In the SAP system, users will
see an hour glass as long as the archiver is stuck, and Oracle will
write an error message into its alert log file and create trace file in
$ORACLE_HOME/saptrace/background.
Never delete archived redo logs without having
them backed up before, as a full recovery from any backup
created up to nowwould not be possible!