Harvinder, I encountered the same problem and it does not seem to be consistent. The fix I was given was to SQL> alter session set"_complex_view_merging"=false; That solved the problem for me. I have no explanation as to why or what is going on but give that a try. Bill Wagman Univ. of California at Davis IET Campus Data Center wjwagman@xxxxxxxxxxx (530) 754-6208 -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] Sent: Wednesday, January 31, 2007 3:04 PM To: oracle-l Subject: Error when running dbms_stats Hi, I am running the following script and getting errors: begin dbms_stats.gather_schema_stats(ownname=> 'HS',estimate_percent=> 100,degree=> dbms_stats.auto_degree,granularity=> 'AUTO',method_opt=> 'FOR ALL COLUMNS SIZE AUTO',options=> 'GATHER',cascade=> TRUE); end; ERROR at line 1: ORA-00979: not a GROUP BY expression ORA-06512: at "SYS.DBMS_STATS", line 13210 ORA-06512: at "SYS.DBMS_STATS", line 13556 ORA-06512: at "SYS.DBMS_STATS", line 13634 ORA-06512: at "SYS.DBMS_STATS", line 13593 ORA-06512: at line 2 This was working before, what can be the possible issue? Thanks --Harvinder -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l