Display lots of Data produces error

Question

Hi there,
I am experiencing an issue and strongly believe will get some pointers/solution to resolve this issue over here.
I am using disco 10g with oracle 9i.
I created a report using disco. Plus. the report works fine and returns the results successfully when run with a defined set of parameter values.
However if I run the report with increased parameter values [i.e. select more customers and select more quotes] I get the error message
The application encountered an invalid state.
- Session closed
OracleBI Discoverer Viewer was unable to find the necessary data for displaying the results of this event. Please correct any errors and try again.
What would be the possible reason for this error message. Is it because it returns lot more data for the second report than the first report with the a defined set values.
Will appreciate all your help on this issue.
Best Regards,
Manish

Answer 1

Hi Manish
As Rod mentions this could be that you are out of memory. Memory is the single-most important resource you can give to Discoverer. If you don't have enough your system will either crash or will run dreadfully slow.
Here's some background information that might help:
As already stated, for your middle-tier, the single-most important resource is memory. CPU count is important but nowhere near as important as your available RAM. You should therefore go for the maximum RAM you can afford or at least get a machine that is capable of being extended. In the following two scenarios, let's look at a situation where we have 100 concurrent users.
The requirements change depending upon whether the 100 concurrent users will be using Plus or if there will be a mix of Plus and Viewer. I will therefore give you two scenarios. For both scenarios you will need to add the following base memory:
Base memory:
The operating system will need 300 Mb and you will need to allocate 800 Mb for the middle-tier and AS Control components. Thus, you need 1.1 GB just to get the machine up and running.
Scenario 1: 100 Plus users
For each Plus user you will need to have 85 Mb available. This comes to 8.5 GB to which you must add the 1.1 GB for the base memory making an intermediate total of 9.6 GB. However, this must be no more than 85% of the available memory. Thus you actually need 11.3 GB which is very close to 12 GB. Because this would give you very little room to grow, as Discoverer will, you will be ok starting with 12 GB but you should buy a machine that is capable of being extended to 16 GB. Because every 4 GB RAM needs one CPU, the machine also needs 4 CPU.
Scenario 2: 40 Plus and 60 Viewer users
Once again for each Plus user you will need to have 85 Mb available. This comes to 3.4 GB. For each Viewer user you will need to have 15 Mb available, meaning you need 900 Mb for your Viewer users. Adding these two numbers to your base memory means you have an intermediate total of 5.4 GB. Again, this must be no more than 85% of the available memory. Thus you actually need 6.4 GB which is well under an initial 8 GB. Because this gives you lots of room to grow, as Discoverer will, I would say you will be ok starting with 8 GB but you should buy a machine that is capable of being extended to 12 GB. Because every 4 GB RAM needs one CPU, 4 CPU is too high for this scenario and you should be ok to start with a 2 CPU machine, although 3 CPU would be better.
Does this help?
Regards
Michael