Oracle database is very slow and hangs sometime

I am using Oracle 11g on Red hat 5.2 . My RAM is of 6 GB and swap size is 12GB . When I checked the used RAM and Swap area by using $ free -m command it shows that enough free memory (almost 4990 GB and swap space (more than 10GB) is available to use. Then I checked an alert.log file as my database was hanged . It contains error like
1. audit commit delay exceeded oracle
2. unable to spawn jobq slave process oracle
3. maximum number of sessions exceeded
4. could not allocate new resource
My init.ora contains following parameters.
Processes =150
Sessions= 248
Transactions = 220
memory_target = 2400m
sga_max_size = 1500m
sga_target = 0m
So, what steps i should take to stop database hanging and how can i boost slow performance ? Is there any problem with my resource manager and if so then how can i correct it?
Thanks
Tushar Lapani

Hi,
Please check the query
SELECT username,default_tablespace from dba_users;
Ususally the default tablespace of the user should not be in SYSTEM tablespace. This might cause performance issue. Create a seperate tablespace and alter/assign this user. Also must move all the objects from SYSTEM tablespace to this new tablespace which you created.
For complete details, you can refer the document http://docs.oracle.com/cd/B14117_01/server.101/b10752.pdf

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