ORA-04031 in the job queue process

I am running Oracle 9.2.0.4 on HP-UX11. I am seeing a lot of error 4031 in the job queue process:

 ORA-04031: unable to allocate 27192 bytes of shared memory ("shared 
 pool","unknown object","sga heap(1,0)","session param values")
 OPIRIP: Uncaught error 447. Error stack:
 ORA-00447: fatal error in background process

 
shared_pool_size=150994944
shared_pool_reserved_size=15099494

Your Shared Pool is too small. This can be verified by running the following query:

select * from v$sgastat where name='free memory';