Performance & PB

Hello,

I am developing an application that contains of two programs
  	One that needs persistency. Here I use PersistenceBroker very  
successfully

	The second one does not need persistency at all, and performance is  
quite important. The program also relies heavily on cached data, but  
there is no need to synchronize the program with the database or with  
other threads. One can assume that the database does not change at  
all during the runtime of the program.

And here comes my problem - I also used PersistenceBroker in this  
program in order to reuse code. Now, I found out through profiling,  
that the program spends about 40 % of its time in PersistenceBroker,  
mostly defaultBroker() and close().

I am accessing the DB heavily (reads only), and for every read I open  
a PB, read the needed data (that should come ot of the cache most of  
the time), then close the PB. This is quite expensive. As a solution,  
I could use only one PB for each thread open it at the start, leave  
it open, and then I would not need any opening and closing at all  
(except the first one for each thread).
	My questions are
	- can I do that and if so, is it wise?
	- are there other - better solutions? May be done through  
configuration of the properties files?

Thank you very much for your help and kind regards,
Ernst

NB - I am using OJB v 1.0.0.