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Database Forum / DB2 Topics / April 2007

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[Question] how to monitor db2 trigger activity ?

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wugon.net@gmail.com - 25 Apr 2007 18:19 GMT
Hi ,
Anyone know how to monitor db2 trigger activity ?

We suffer some trigger issue , and we try to monitor trigger's
behavior use event monitor and db2audit, but both tools can not get
trigger's sql statment and cost, have other tools can get trigger's
executing sql statment and cost ?

our test case as follow:
Env:
WIN XP
DB2 V8 + FP13

1. create sample  table
create table DB2.NEWS ( ID INT, NAME CHAR(10),T_TIME timestamp )  IN
TBS16K @

create table DB2.NEWSQ1 ( ID INT, NAME CHAR(10),T_TIME timestamp with
default current timestamp)  IN TBS16K @

2. create sample trigger
create trigger DB2.NEWSTRG
    after insert on  DB2.NEWS
    referencing
    new as nw_row
    for each row
    mode db2sql
    BEGIN ATOMIC
        insert into DB2.NEWSQ1 (ID, NAME)
        values     ( (nw_row.ID+1000),
            nw_row.NAME) ;
    END  @

3. create event  and activate
create event monitor failtrigger  for
tables,
statements,
transactions
write to file 'd:\event'  ;
set event monitor failtrigger  state 1 ;

4. insert data to DB2.NEWS
db2 "insert into DB2.NEWS  values (1,'aa',current timestamp)"

5. check data
db2 "select * from  db2.news"
db2 "select * from  db2.newsq1"

6.format event
db2evmon -path d:\event

part of event output:
only can get insert sql statement and  Internal rows inserted count
but without trigger sql statment.

we also try db2audit, still can not get executing  sql statment.

do anyone know how to monitor db2 trigger executing  activity ?
Thanks
=====================================================
32) Statement Event ...
 Appl Handle: 24
 Appl Id: *LOCAL.DB2.070425165450
 Appl Seq number: 0006

 Record is the result of a flush: FALSE
 -------------------------------------------
 Type     : Dynamic
 Operation: Execute Immediate
 Section  : 203
 Creator  : NULLID
 Package  : SQLC2E07
 Consistency Token  : AAAAAcEU
 Package Version ID  :
 Cursor   :
 Cursor was blocking: FALSE
 Text     : insert into DB2.NEWS  values (1,'aa',current timestamp)
 -------------------------------------------
 Start Time: 2007-04-26 00:56:19.910300
 Stop Time:  2007-04-26 00:56:19.910445
 Exec Time:  0.000145 seconds
 Number of Agents created: 1
 User CPU: 0.000000 seconds
 System CPU: 0.000000 seconds
 Fetch Count: 0
 Sorts: 0
 Total sort time: 0
 Sort overflows: 0
 Rows read: 0
 Rows written: 2
 Internal rows deleted: 0
 Internal rows updated: 0
 Internal rows inserted: 1
===============================================================
Serge Rielau - 25 Apr 2007 19:02 GMT
> Hi ,
> Anyone know how to monitor db2 trigger activity ?
[quoted text clipped - 3 lines]
> trigger's sql statment and cost, have other tools can get trigger's
> executing sql statment and cost ?
Since the triggers in DB2 for LUW are inlined this data simply deosn't
exist.
It's like asking for the execution time of views...

Cheers
Serge
Signature

Serge Rielau
DB2 Solutions Development
IBM Toronto Lab

wugon.net@gmail.com - 26 Apr 2007 08:13 GMT
> wugon....@gmail.com wrote:
> > Hi ,
[quoted text clipped - 15 lines]
> DB2 Solutions Development
> IBM Toronto Lab

Hi Serge,
Thanks your explain.
Knut Stolze - 25 Apr 2007 21:58 GMT
> We suffer some trigger issue

What's the issue?

Signature

Knut Stolze
DB2 z/OS Utilities Development
IBM Germany

wugon.net@gmail.com - 26 Apr 2007 14:42 GMT
> wugon....@gmail.com wrote:
> > We suffer some trigger issue
[quoted text clipped - 5 lines]
> DB2 z/OS Utilities Development
> IBM Germany

our report team challenge the db2 trigger transfer incorrect data
impact report result,
follow our data flow :
Tx1 -> DB2 Base table -> trigger to history table
another AP routine get history data and parse into back end  db

report team found back end  db  data incorrect and challenge the db2
trigger.
We try to monitor trigger executing sql to find out the root cuase for
incorrect report.

Thanks you response.
Knut Stolze - 26 Apr 2007 21:45 GMT
>> wugon....@gmail.com wrote:
>> > We suffer some trigger issue
[quoted text clipped - 16 lines]
> We try to monitor trigger executing sql to find out the root cuase for
> incorrect report.

If there is indeed incorrect data in the history table, then your trigger
would have a problem.

What you could monitor is the insert/update/delete statement issued against
the "DB2 base table" and also the activity on the history table.  Then you
can match both (based on a timestamp, for instance) and figure out where
the problem is with the trigger.

Signature

Knut Stolze
DB2 z/OS Utilities Development
IBM Germany

wugon.net@gmail.com - 27 Apr 2007 01:55 GMT
> wugon....@gmail.com wrote:
> >> wugon....@gmail.com wrote:
[quoted text clipped - 32 lines]
>
> - Show quoted text -

Hi Knut ,
Thanks your advice.
 
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