How to increase the buffer size for Oracle?

After I installed the patch 9.2.0.4, I kept getting 'ORA-03113: end-of-file on communication channel' error. According to the metalink, increasing the buffer size may solve this problem. I found when I set the trace on, this problem was gone, and after I set the trace off, it came back again. I am not sure if setting the trace on increases buffer size automatically or not, but I want to start from here.
No matter how easy it is, I really didn't change buffer size before, can anyone show me how to do that?
Thanks a lot.

Hi,
I think they asked to increase the db buffer cache size. You may try this
alter system set db_cache_size=<new size in bytes> scope=both;
Cheers
Muneer

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