Monday, July 21, 2008

Configuration Settings for Tracing

Online Process

Set the following in psappsrv.cfg, or for a single user session in PIA using trace=y

“31” is the recommended value when tracing with “TraceSQL”.
“1984” is the recommended value when tracing with “TracePC”.

Batch Process

Application Engine

"135" is the recommended value when tracing with "TraceAE"

if peoplecode tracing is needed, please also set

TraceSQL= 31

TracePC = 1984

You can also do this in process definition of Application Engine to affect this for only 1 program.

Override options : Append : -TRACE 135 -TOOLSTRACESQL 31 -TOOLSTRACEPC 1984

To see which processes are set with this options, run this sql.

SELECT PRCSNAME, PARMLIST FROM PS_PRCSDEFN WHERE UPPER(PARMLIST) LIKE '%TRACE%' AND PRCSTYPE = 'Application Engine';

To generate Database Level Trace, Use TraceAE=2183. This will create file within the "UDUMP" directory on the database server.

It will contain details of each SQL statement that was executed on the database including its runtime execution plan. You can then use this as a input to tkprof for generating formatted trace report. However this will not capture bind variables. To capture bind variables, following trigger is needed.

CREATE OR REPLACE TRIGGER MYDB.SET_TRACE_POCALC

BEFORE UPDATE OF RUNSTATUS ON MYDB.PSPRCSRQST

FOR EACH ROW

WHEN ( NEW.runstatus = 7

AND OLD.runstatus != 7

AND NEW.prcstype = 'Application Engine'

AND NEW.prcsname = 'PO_PO_CALC'

)

BEGIN

EXECUTE IMMEDIATE

'ALTER SESSION SET TIMED_STATISTICS = TRUE';

EXECUTE IMMEDIATE

'ALTER SESSION SET MAX_DUMP_FILE_SIZE = UNLIMITED';

EXECUTE IMMEDIATE

'ALTER SESSION SET TRACEFILE_IDENTIFIER = ''POCALC''';

EXECUTE IMMEDIATE

'ALTER SESSION SET EVENTS = ''10046 TRACE NAME CONTEXT FOREVER, LEVEL 12''';

END;

/

Cobol Process

TraceSQL=128

SQR Process

A database level trigger is the only way for generating SQR trace.

Sample trigger script.

CREATE OR REPLACE TRIGGER MYDB.SET_TRACE_INS6000

BEFORE UPDATE OF RUNSTATUS ON MYDB.PSPRCSRQST

FOR EACH ROW

WHEN ( NEW.runstatus = 7

AND OLD.runstatus != 7

AND NEW.prcstype = 'SQR REPORT'

AND NEW.prcsname = 'INS6000'

)

BEGIN

EXECUTE IMMEDIATE

'ALTER SESSION SET TIMED_STATISTICS = TRUE';
EXECUTE IMMEDIATE

'ALTER SESSION SET MAX_DUMP_FILE_SIZE = UNLIMITED';
EXECUTE IMMEDIATE

'ALTER SESSION SET TRACEFILE_IDENTIFIER = ''INS6000''';
EXECUTE IMMEDIATE

'ALTER SESSION SET EVENTS = ''10046 TRACE NAME CONTEXT FOREVER, LEVEL 12''';

END;

/

Once the raw database trace is captured, execute the program “tkprof” with following sort options:

tkprof <trace_input_file> <rpt_output_file> sys=no explain=<user_id>/<password> sort=exeela,fchela,prscpu,execpu,fchcpu

For more information, Read peoplesoft resolution 201049233: E-ORACLE:10g Master Performance Solution for Oracle 10g and download the red paper attached to it.

1 comment:

Larry said...

Very satisfactory tips. Similar questions I got it in one of the interview and that time I was unable to answer those. There are lot of tips and questions at www.itwisesolutions.com/PsftQuiz.html website, that I found useful.

thanks
Larry