How to check Oracle database for long running queries

Question

My application, which uses an Oracle database, is going slow or appears to have stopped completely.

How can find out which queries are most expensive, so I can inves

Answer 1

You can check the long-running queries details like % completed and remaining time using the below query:

 SELECT SID, SERIAL#, OPNAME, CONTEXT, SOFAR, 
 TOTALWORK,ROUND(SOFAR/TOTALWORK*100,2) "%_COMPLETE" 
 FROM V$SESSION_LONGOPS 
 WHERE OPNAME NOT LIKE '%aggregate%' 
       AND TOTALWORK != 0 
       AND SOFAR <> TOTALWORK;

For the complete list of troubleshooting steps, you can check here:Troubleshooting long running sessions