Amir, To convince me that there actually is unaccounted-for time in your case, I'd need to see the raw trace file. I would certainly have to see the trace data to make any educated guess about what's causing it, if it does exist. Cary Millsap Method R Corporation On Sep 13, 2013, at 2:48 PM, "Hameed, Amir" <Amir.Hameed@xxxxxxxxx> wrote: > Hi, > I ran a simple SELECT statement where I drove a FTS on a large table and then > trace it at level 8. Below is the SQL statement: > select /*+ full(MMT) */ count(*) from apps.mtl_material_transactions MMT ; > Here is the output from TKPROF: > > call count cpu elapsed disk query current > rows > ------- ------ -------- ---------- ---------- ---------- ---------- > ---------- > Parse 1 0.01 0.00 0 0 0 > 0 > Execute 1 0.00 0.00 0 0 0 > 0 > Fetch 2 174.21 841.44 7852466 7853454 0 > 1 > ------- ------ -------- ---------- ---------- ---------- ---------- > ---------- > total 4 174.22 841.44 7852466 7853454 0 > 1 > > Elapsed times include waiting on following events: > Event waited on Times Max. Wait Total Waited > ---------------------------------------- Waited ---------- ------------ > library cache lock 1 0.00 0.00 > library cache pin 1 0.00 0.00 > SQL*Net message to client 2 0.00 0.00 > Disk file operations I/O 123 0.00 0.00 > gc current block 3-way 1 0.00 0.00 > enq: KO - fast object checkpoint 3 0.01 0.01 > reliable message 1 0.00 0.00 > direct path read 1919 4.48 356.76 > gc cr block 2-way 31 0.00 0.01 > db file sequential read 201 0.03 0.63 > gc cr disk read 1 0.00 0.00 > SQL*Net message from client 2 0.00 0.00 > ******************************************************************************** > > I am not able to reconcile the elapsed time and the discrepancy is just too > much: > elapsed - cpu = 667.22 > Total Waited = 357.4 > Unaccounted for time = 667.22 - 357.4 = 309.82 > > I know that Cary Milsap has talked about unaccounted for time in TKPROF > output but this gap is just too much. Any idea where to look for the missing > time? > > Thanks, > Amir > > -- > //www.freelists.org/webpage/oracle-l > > -- //www.freelists.org/webpage/oracle-l