1. add hint to monitor a particular SQL
eg. select/*+ monitor */ emp_name from emp;
2. to get sid for the sql
select SQL_ID,sum(buffer_gets) buffer_gets,
sum(disk_reads)disk_reads,round(sum(cpu_time/1000000),1) cpu_secs
from v$sql_monitor
where sql_text like '%monitor%'
3. check the SQL PLAN for this sql
using SQL_ID to get the SQL PLAN
SELECT DBMS_SQLTUNE.report_sql_monitor(sql_id => '1kfww208s1gtz', type => 'TEXT') AS report FROM dual;