We are facing some issues with Crystal report server while running scheduled reports with high volume data. Reports are running for long time and getting failed throwing the below error message
*Error Message: Not enough memory for operation.*

We done a Application Server upgradation from WAS 5.1 to WAS 6.1 (WebSphere)
Is there any chance for this upgradation resulting to this exception?

Where we need to check to resolve the issue?
Please advice...