Informix version IDS 7.x
Informix version IDS 7.x does not have a mechanism for deleting records of expired backups from its backup database. NetBackup for Informix provides a script that can delete these records from the Informix backup database if the NetBackup image database has expired the backups. Run execute the following command as user informix or the Informix Administrator.
/usr/openv/netbackup/ext/db_ext/informix/scripts/infx_remove_expired_images
When this script runs, it creates files in the /tmp directory. These files are not removed. Later, they can be used to diagnose any problems that occur.