How to query the current instance size of an instance of a process

Question

Hello guys,
I'm currently doing a Capacity Plan for my BPM enviroment and I would like to know the current instance size of different kind of processes deployed in my environment. I'll need this to calculate an average instance size per process. The main reason for this capacity plan is that our environment instance size is configured to more then 1000kb(don't know what kind of issues occurred in the past that led to this exceeded value configured) and I don't want to leave this configuration but I can't be safe decreasing it without know if our production environment will start launching the "Max Instance Size Exceeded" error.
Is there any way to fetch this information? Any API or SQL Query where I can find this information?
Thanks for any help.
Regards,
Luiz
Edited by: Luiz Rocha on 30/04/2009 16:50

Answer 1

Hi, Luiz!
In order to estimate the instance size, you will have to sum up all the instance variables size.
From the practical prospective it may be difficult to use the algorithm in cases when your instance variables are not simple types.
For already existing instances, you can look the instance size in the database:
An instance is just a java object, that is serialized as a byte[] and stored in the engine database, PPROCINSTANCE table, column INSTDATA.
You can write a simple program (either java or SQL plus) that would read the instance from the BLOB and measure the size.
And yes, with large instances you can have performance problems.