Hi Bob > AUTO_STOP This job is used to stop the gathering. This is basically the same as the mode STOP (which is documented). > flush_cache This job modifies either sys.cache_stats_0$ or sys.cache_stats_1$. Their aim is to store caching information at object level. Notice that: - This job is removed when the AUTO_STOP job runs. - This job is also available if the gathering is performed manually with the mode START. HTH Chris -- //www.freelists.org/webpage/oracle-l