Problem in running parallel query

Hi All,
We have an Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 installed on Microsoft Windows 2000 Advanced Server 5.0.2195 Service Pack 4 Build 2195.
And we have a stored procedure which does lots of works.
In this procedure, there is a select statement which joins a huge table with milions of records(lets call it table X) to some other almost huge tables. This table X
is partitioned and parallel processing has been enabled on it. Every thing has been fine until a week ago. From then on, we are getting the following error in that procedure:
ORA-12801: error signaled in parallel query server P014
ORA-04030: out of process memory when trying to allocate 4194328 bytes (QERHJ hash-joi,QERHJ list array)
We have made some changes in that select statement which are very common changes like adding some additional where clauses and selecting some additional columns. The From List of select statement has not been changed.
I don't exactly know what is realy going on.
The available memory is about 2 GB when the mentioned procedure crashes.
Any Idea?
My Best,
Alireza Vali

Is it a 32bit installation (32bit Windows, 32bit Oracle) ?
What are your MEMORY_TARGET, SGA_TARGET, SGA_MAX_SIZE and PGA_AGGREGATE_TARGET parameters set to ? (If you have MEMORY_TARGET set, it is not necessary that the other parameters be set).
ORA-4030 relates to PGA memory, not SGA memory. But Oracle on Windows is a single, multi-threaded process. Therefore, all Oracle "processes" (threads in the Windows process) share the same memory (address) space, even the SGA and PGA.
Hemant K Chitale

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