ORA-04030 : Out of Process Memory

Ora-04030 indicates that the oracle server process is unable to allocate more memory from the operating system.This memory consists of the PGA (Program Global Area) and its contents depend upon the server configuration.For dedicated server processes it contains the stack and the UGA (User Global Area) which holds user session data, cursor information and the sort area. In a multithreaded configuration (shared server), the UGA is allocated in the SGA (System Global Area) and will not be responsible for ORA-4030 errors.

In my case it occurs when a client program connects to oracle database an oracle process doesnot work and throws the Ora-04030 Out of Process Memory.

After getting this error, we troubleshoot this errors and on googling we finally come to conclusion that it is a BUG . Finally we have to taken the support for this error .

This error occurs due to various reason which is listed below :

1.) The Oracle process need more memory in order to request client program and it requests additional memory from Operating System but the Operating System can't serve the request. This is likely to happen if OS does not have enough memory or swap space is not available.

2.) There is a memory limit restriction from OS for oracle process to use. Oracle process already use the limit and now it requested additional memory and hence error appears.

3.) Might be an oracle bug .

Below are few links which are quite useful to understand this error.

http://orainternals.wordpress.com/2009/08/06/ora-4031-and-shared-pool-duration/
http://jhdba.wordpress.com/2009/11/13/problems-with-sga-a-multiiple-of-4gb-and-high-cpu-count/
http://www.tek-tips.com/viewthread.cfm?qid=835937
http://gdesaboyina.wordpress.com/2009/12/04/ora-04030-out-of-process-memory-when-trying-to-allocate-840-bytes-kgsp-heapkglss/


Enjoy      :-)