Peter,
In the perfect world you would expect the two explain plans (don't worry
about the different headings) to be identical. Someone can probably answer
this precisely but the first one is created during the trace and the second
one is provided because you supplied the "explain=user/pass" option to
tkprof - it basically says "go back and get an explain plan for each
query".
Are you sure that both explain plans are generated using the same username
on the same instance? Is one perhaps connecting to a different database
such as development? In essence - if you run "sqlplus user/pass" from the
same place you ran tkprof are you connected to the exact same location as
the session that created the trace file?
Unfortunately if you are connected to the same area then I cannot help much
more. Perhaps try taking the statement and use autotrace in sqlplus to see
which plan it provides. Perhaps row level security of something is kicking
in and modifying the query (this caught us out once when explain plans
changed because we were connected as a different user)?
Regards,
Mark.
"Schauss, Peter"
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ORACLE-L <[EMAIL PROTECTED]>
hgrum.com> cc:
Sent by: Subject: Interpretation of TKPROF
output
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14/10/02 06:03
Please respond to
ORACLE-L
I am running tkprof on some trace files with the following options:
(Oracle 8.1.7)
explain=<user>/<password> sort=exeqry,fchqry,execu,fchcu
Output after each query includes the following two tables:
Rows Row Source Operation
------- ---------------------------------------------------
36 INLIST ITERATOR
36 TABLE ACCESS BY INDEX ROWID PART_LIST
72 INDEX RANGE SCAN (object id 3451)
Rows Execution Plan
------- ---------------------------------------------------
0 SELECT STATEMENT GOAL: CHOOSE
36 TABLE ACCESS GOAL: ANALYZED (FULL) OF 'PART_LIST'
The "Execution Plan" table corresponds to the Explain Plan section
of the Performance manual. There is no mention, however, of the
"Row Source Operation" table. I note particularly, that in some cases
the first table seems to agree with the second. In others, however, such as
the example here, the Row Source table shows use of an index while the
Execution Plan shows a Table Access (Full table scan?).
Am I interpreting this correctly? If so, what is going on?
Thanks,
Peter Schauss
Northrop Grumman Corporation
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