https://www-01.ibm.com/support/knowledgecenter/SSEPGG_9.7.0/com.ibm.db2.luw.admin.perf.doc/doc/c0005095.html?lang=en

DETAILEDCalculates extended index statistics. The extended index statistics are the CLUSTERFACTOR and PAGE_FETCH_PAIRS statistics that are gathered for relatively large indexes. Not all index entries are examined, a CPU sampling technique is employed...

才疏学浅，这个问题还是第一次听到，检查jobserver状态、权限，重新启动调度程序