RE: Anonymous block performing much worse then separated statements
- From: "Dunbar, Norman (Capgemini)" <norman.dunbar.capgemini@xxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <dcowles@xxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 28 Jul 2011 07:56:19 +0100
Morning Doug,
>> I two statements that when are executed separately, a
>> truncate and an insert - they run in seconds.
>> When put in an anonymous block, they take more than 20
>> minutes and begin to throw errors.
>> Does anyone have any explanation for this?
No. :-(
>> the block looks something like this -
>> BEGIN
>> TRUNCATE_TABLE('WANDH_HR');
>> INSERT INTO WANDH_HR(EMPLID,STATE,CREATE_TS,MAINT_TS)
>> (SELECT
>> A.EMPLID
>> ,'NJ' As "STATE"
>> ,'12-Jul-2011' As "CREATE_TS"
>> ,'12-Jul-2011' As "MAINT_TS"
>> FROM
>> .etc.,
>> END;
Try adding this at the start of the block, after the begin:
dbms_support.start_trace(waits => true, binds => false);
and this at the end:
dbms_support.stop_trace;
Alternatively, as this is 10g, try this instead:
dbms_monitor.session_trace_enable(waits => true, binds =>
false);
and
dbms_monitor.session_trace_disable;
That will create a trace file showing exactly where the time was spent.
If you don't have sys.dbms_support, then run
$ORCALE_HOME/sqlplus/admin/dbmssupp as SYSDBA to install it, create a
public synonym for it and grant execute to DBA and to your user while
you sort things out. You can revoke execute from your user when problem
solved.
HTH
Cheers,
Norm.
Norman Dunbar
Contract Senior Oracle DBA
Capgemini Database Team (EA)
Internal : 7 28 2051
External : 0113 231 2051
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