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How to display the execution plan for a finished SQL

Oracle Database Tips by Donald BurlesonNovember 8, 2015

Question:  I have a developer who e-mailed me a SQL statement that he ran an hour ago and he wants to know the SQL explain plan that was used by the SQL statement.  Does Oracle keep the execution plan for finished SQL statements?  If so, how do I display the execution plan for a completed SQL query?

Answer:  Oracle keeps SQL in the v$sql_plan view until it gets aged-out, and Oracle MIGHT keep the SQL statement in dba_hist_sql_plan if the SQL query meets the AWR/STATSPACK threshold collection values.  For a complete explanation see my book  "Advanced Oracle SQL Tuning  The Definitive Reference" 

Assuming that the SQL is still in the library cache, you can use the SQL statement to extract the "address" column from v$sqlarea and then use the address to display the execution plan from v$sql_plan.  Get the free Oracle reference poster to know all of the structures.

Step 1: Plug-in some of the SQL source code into the query below:

select
   db_id,
   sql_id,

   sql_text,
from
   v$sqlarea
where
   upper(sql_text) like '%MY_TABLE_NAME%'
order by
   disk_reads desc;


  


2. Use the address to query dba_hist_sql_plan: 

select * from table(dbms_xplan.display_awr('sql_id'));

or

select
   s.begin_interval_time,
   s.end_interval_time ,
   q.snap_id,
   q.dbid,   
   q.sql_id,
   q.plan_hash_value,
   q.optimizer_cost,
   q.optimizer_mode
from
   dba_hist_sqlstat q,
   dba_hist_snapshot s
where
   q.dbid = nnnnnnn
and
   q.sql_id = 'xxxxxx'

and q.snap_id = s.snap_id

and s.begin_interval_time between sysdate-2 and sysdate

order by s.snap_id desc;

 

 
Get the Complete
Oracle SQL Tuning Information 

The landmark book "Advanced Oracle SQL Tuning  The Definitive Reference"  is filled with valuable information on Oracle SQL Tuning. This book includes scripts and tools to hypercharge Oracle 11g performance and you can buy it for 30% off directly from the publisher.

 

 

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  

and include the URL for the page.


                    









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