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Don Burleson Blog 







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:


   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'));


   s.end_interval_time ,
   dba_hist_sqlstat q,
   dba_hist_snapshot s
   q.dbid = nnnnnnn
   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;


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