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Re: SQL trigger question -- use a java client instead



fixed

Thanks all replies!

To Alan: yes, my original idea was to make the 3 table inserts faster.
BTW, how to "Map a
user space or memory. Write all the records into the array and do one
write"?

Right now I am thinking using a java client that access system i through
JDBC driver. I initialize new threads in my java code. Any comments?


YanZ



From:
Alan Campin <alan0307d@xxxxxxxxx>
To:
Java Programming on and around the IBM i <java400-l@xxxxxxxxxxxx>
Date:
08/25/2010 11:38 PM
Subject:
Re: SQL trigger question
Sent by:
java400-l-bounces@xxxxxxxxxxxx



As far as I know you can't. Think about what we would happen if you did.
Tread 2 might complete before tread1 but tread 2 might have dependancies
on
tread1 working. I doubt it would be supported.

Is that why you are using three triggers trying to make it perform faster?
Having three triggers is going to add overhead. Why not put in one
trigger?
If you are looking to improve performance on writes, use any array. Map a
user space or memory. Write all the records into the array and do one
write.
.

On Wed, Aug 25, 2010 at 3:20 PM, <Yan.Zhang@xxxxxxxxxx> wrote:

If I want to get separate threads going -- all these threads run
parallel.
How do I do it?


YanZ




From:
"Clapham, Paul" <pclapham@xxxxxxxxxxxxx>
To:
"Java Programming on and around the IBM i" <java400-l@xxxxxxxxxxxx>
Date:
08/25/2010 05:16 PM
Subject:
RE: SQL trigger question
Sent by:
java400-l-bounces@xxxxxxxxxxxx



That seems perfectly normal to me. In fact I would be surprised if the
database software started separate threads for each of the triggers.
That would be just asking for trouble.

PC2

-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx
[mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of
Yan.Zhang@xxxxxxxxxx
Sent: August 25, 2010 13:58
To: Java Programming on and around the iSeries / AS400
Subject: SQL trigger question

I have 3 "after update" triggers on Table0: T1, T2, and T3. All these 3
triggers are built on Table0.
T1 inserts some records into Table1;
T2 inserts some records into Table2;
T3 inserts some records into Table3.

So, after Table0 is updated, I think T1,T2.and T3 would be launched at
the same time.
But why in my experiments it shows the "insert into...." for 3 tables
are executed sequentially? i.e. A bunch of records are inserted into
Table1, then a bunch of records are inserted into Table2, then a bunch
of records are inserted into Table3.


thanks,
YanZ
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