what can i do to solved this problem
I Think should raise the number of max.processes on your system.
Usually
I don't know the command/place om sparc, it is the SEMMNS setting.
Put it to a value like 2000.
Shakespeare
You should check your Solaris installation. Post-wait device is a small
pseudo-device which is faster then SVR4 semaphores and is used instead of
them by the Oracle server processes. It is not a general mechanism, it is
located in the OS-dependent portion of the code and only serves for the
I/O coordination of LGWR, CKPT and DBWR. However, this pseudo-device is
also loaded as a part of the SVR4 IPC mechanism. You probably have some
errors in /etc/system.