col event format a30 col sample_time format a25 set linesize 180 set pagesize 100 /* define wait_threshold=10 */ prompt -> Find waits grouped by Instance,SessioniID,SQLID,Event select inst_id, session_id, sql_id,event, count(*) CNT from gv$active_session_history where user_id = ( select USER_ID from dba_users where USERNAME = 'SCOTT' ) and sql_id is not null and sample_time between (sysdate -(4/24) ) and sysdate group by inst_id, session_id,sql_id, event having count(*) > &wait_threshold order by inst_id, session_id, sql_id, CNT;