Hi Joan and all, What it's puzzling me is the output of id=27, the iff on PS0PERSONAL_DATA . On QA returns 31,967 , vs. 0 on TRN. stats for PS_EMPLOYMENT are the same on both (including indexes)???? regards, alvaro (QA: STAT #1 id=27 cnt=0 pid=13 pos=2 obj=64184 op='INDEX FAST FULL SCAN PS0PERSONAL_DATA (cr=0 pr=0 pw=0 time=0 us)' ) -- //www.freelists.org/webpage/oracle-l