RE: sql problem

http://tech.e2sn.com/oracle/troubleshooting/how-to-read-errorstack-output


Tanel talks of reading bind variables using an errorstack trace.

Regards
Raj

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Stephens, Chris
Sent: Tuesday, March 16, 2010 3:58 PM
To: oracle-l_at_freelists.org
Subject: sql problem

10.2.0.4 Red Hat Linux

I found a very simple query that is consuming a ton of I/O resources.  Depending on the bind value, the query should be using an index.  I've set the statistics_level to 'ALL' in the database since the sql is issued from a canned application and I haven't been able to get a hold of the users to actually trace a session.  The column is a timestamp datatype.  I was hoping to get the value used for :1 with the following:

SQL:

select * from table(dbms_xplan.display_cursor('3wc8wxtk6cnjz',2,'allstats  +peeked_binds'));


SQL_ID  3wc8wxtk6cnjz, child number 2
-------------------------------------
SELECT t_stamp, DPT_102, PT_104, PT_102, PT_108, PT_115, PT_117, PT_106, PT_110, DPT_101 FROM PGREACTOR2SEC WHERE
t_stamp >= :1 ORDER BY t_stamp

Plan hash value: 2198310677

----------------------------------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name                                                             | Starts | E-Rows | A-Rows |   A-Time   | Buffers | Reads  |
----------------------------------------------------------------------------------------------------------------------------
|   1 |  TABLE ACCESS BY INDEX ROWID| PGREACTOR2SEC                     |     46 |      1 |   6220K|00:00:33.26 |    1410K|  13161 |
|*  2 |   INDEX RANGE SCAN          | PGREACTOR2SEC_T_STAMP_NDX |     46 |      1 |   6220K|00:00:07.46 |     634K|    959 |
----------------------------------------------------------------------------------------------------------------------------

Peeked Binds (identified by position):
--------------------------------------

   1 - (TIMESTAMP): [Not Printable]

Predicate Information (identified by operation id):
---------------------------------------------------

   2 - access("T_STAMP">=:1)

Here the index is used but that isn't always the case.  Is there any other way other than 100046 trace to get the bind value?

Also, there isn't much SQL being executed in this database.  Is there a way to get Oracle to evaluate the value of the bind variable on each execution to ensure an appropriate execution plan?

Thanks,
Chris

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