Hi Niall/Zoran , this was the reply i got from him. ***************************************************************************= * It maybe hard to tell because when our database is running daily jobs, the majority wait events are: db file sequential read , direct path read PX related events , i/o slave wait , db file scattered read SQL*Net message to/from dblink When we re-create the index, all other jobs will not be running. We can still assume the same major events as in running daily jobs, except the "SQL*Net message to/from dblink" ***************************************************************************= *** thanx guys for all ur help. Regards, Prem. -- //www.freelists.org/webpage/oracle-l