I have been having this issue , PXA_NO_Shared_Memory error on ECC 6.0 oracle system on Solaris 10. We adjusted abap/buffer and it did not help. Our system is having 64 GB and nearly 60 % memory is free all the time. We have also rebooted solaris box but still we are getting the same error. Becuase of this, SAP is starting in emergency mode with two dw processes.
Any help on this is greatly appreciated